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<button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Gault%2C+B&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Gault%2C+B&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Gault%2C+B&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Gault%2C+B&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.10506">arXiv:2411.10506</a> <span> [<a href="https://arxiv.org/pdf/2411.10506">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Performance Evaluation of Deep,Near Ultraviolet Laser Assisted Atom Probes for a range of Material system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+C">Chang-Gi Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Chae%2C+B">Byeong-Gyu Chae</a>, <a href="/search/cond-mat?searchtype=author&query=Ro%2C+I">I-Jun Ro</a>, <a href="/search/cond-mat?searchtype=author&query=Jang%2C+K">Kyuseon Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E">Eric Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Ahn%2C+J">Jaemin Ahn</a>, <a href="/search/cond-mat?searchtype=author&query=Park%2C+S+Y">Seong Yong Park</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.10506v1-abstract-short" style="display: inline;"> Atom probe tomography (APT) enables near atomic scale three dimensional elemental mapping through the controlled field evaporation of surface atoms triggered by the combined application of a DC voltage and either voltage or laser pulses. As the selected laser wavelength for the atom probes transitioned from the near-infrared (1050 nm) to shorter wavelengths e.g., green (532 nm) and near ultraviole… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10506v1-abstract-full').style.display = 'inline'; document.getElementById('2411.10506v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.10506v1-abstract-full" style="display: none;"> Atom probe tomography (APT) enables near atomic scale three dimensional elemental mapping through the controlled field evaporation of surface atoms triggered by the combined application of a DC voltage and either voltage or laser pulses. As the selected laser wavelength for the atom probes transitioned from the near-infrared (1050 nm) to shorter wavelengths e.g., green (532 nm) and near ultraviolet, the quality of data improved and the range of materials amenable for analysis broadened. A new commercial laser atom probe with a wavelength of 257.5 nm, referred to as deep ultraviolet (DUV), has been recently launched. However, the effects of DUV lasers on different classes of materials have not yet been systematically investigated. In this study, a range of materials, including metals, semiconductor, and oxides, have been examined using commercial atom probes with different laser wavelengths but in principle comparable particle detection system. The quality of the NUV and DUV laser atom probe data is evaluated based on four key metrics: background, detection events, ion detection histogram, and mass-resolving power. Furthermore, the application of a thin coating to the finished APT specimens enhances the data quality for both laser wavelengths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10506v1-abstract-full').style.display = 'none'; document.getElementById('2411.10506v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.10350">arXiv:2411.10350</a> <span> [<a href="https://arxiv.org/pdf/2411.10350">pdf</a>, <a href="https://arxiv.org/format/2411.10350">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Secondary Grain Boundary Dislocations Alter Segregation Energy Spectra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xinren Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Gon%C3%A7alves%2C+W">William Gon莽alves</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+Y">Yi Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+Y">Yipeng Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Harrison%2C+P">Patrick Harrison</a>, <a href="/search/cond-mat?searchtype=author&query=Das%2C+S+M">Saurabh Mohan Das</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Ludwig%2C+W">Wolfgang Ludwig</a>, <a href="/search/cond-mat?searchtype=author&query=Rauch%2C+E">Edgar Rauch</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.10350v1-abstract-short" style="display: inline;"> Grain boundaries (GBs) trigger structure-specific chemical segregation of solute atoms. According to the three-dimensional (3D) topology of grains, GBs - although defined as planar defects - cannot be free of curvature. This implies formation of topologically-necessary arrays of secondary GB dislocations. We report here that these pattern-forming secondary GB dislocations can have an additional an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10350v1-abstract-full').style.display = 'inline'; document.getElementById('2411.10350v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.10350v1-abstract-full" style="display: none;"> Grain boundaries (GBs) trigger structure-specific chemical segregation of solute atoms. According to the three-dimensional (3D) topology of grains, GBs - although defined as planar defects - cannot be free of curvature. This implies formation of topologically-necessary arrays of secondary GB dislocations. We report here that these pattern-forming secondary GB dislocations can have an additional and, in some cases, even a much stronger effect on GB segregation than defect-free GBs. Using nanoscale correlative tomography combining crystallography and chemical analysis, we quantified the relationship between secondary GB dislocations and their segregation energy spectra for a model Fe-W alloy. This discovery unlocks new design opportunities for advanced materials, leveraging the additional degrees of freedom provided by topologically-necessary secondary GB dislocations to modulate segregation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.10350v1-abstract-full').style.display = 'none'; document.getElementById('2411.10350v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.15776">arXiv:2410.15776</a> <span> [<a href="https://arxiv.org/pdf/2410.15776">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Magnetocaloric effect of Fe47.5Ni37.5Mn15 bulk and nanoparticles: A cost-efficient alloy for room temperature magnetic refrigeration </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+C">Chang-Gi Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Nallathambi%2C+V">Varatharaja Nallathambi</a>, <a href="/search/cond-mat?searchtype=author&query=Kang%2C+T">TaeHyeok Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo Shoji Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Reichenberger%2C+S">Sven Reichenberger</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A">Ayman El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Choi%2C+P">Pyuck-Pa Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.15776v1-abstract-short" style="display: inline;"> The development of magnetic refrigerators that operate at room temperature without the use of environmentally harmful substances represents a significant advancement in eco-friendly technology. These refrigerators employ the magnetocaloric effect (MCE), which has traditionally been achieved using expensive rare-earth elements such as gadolinium. To facilitate cost-effective commercialization, it i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.15776v1-abstract-full').style.display = 'inline'; document.getElementById('2410.15776v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.15776v1-abstract-full" style="display: none;"> The development of magnetic refrigerators that operate at room temperature without the use of environmentally harmful substances represents a significant advancement in eco-friendly technology. These refrigerators employ the magnetocaloric effect (MCE), which has traditionally been achieved using expensive rare-earth elements such as gadolinium. To facilitate cost-effective commercialization, it is essential to investigate alternative materials, such as transition metal alloys. In this study, an Fe47.5Ni37.5Mn15 alloy, which has a Curie temperature that is close to room temperature, is cast, and the alloy exhibits a noteworthy cooling power of 297.68 J/kg, which makes it good for cost-effective applications. To further enhance MCE performance through super-paramagnetism (e.g. size reduction), nanoparticles of the same composition are synthesized using a top-down approach via pulsed-laser ablation in ethanol. However, these nanoparticles do not exhibit a Curie temperature near room temperature, likely due to significant carbon incorporation during synthesis, which adversely affected their magnetocaloric properties. This study underscores the potential of transition metal alloys for magnetic refrigeration and highlights the need for optimized synthesis methods to achieve desired thermal properties in nanoparticulate form. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.15776v1-abstract-full').style.display = 'none'; document.getElementById('2410.15776v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.11274">arXiv:2410.11274</a> <span> [<a href="https://arxiv.org/pdf/2410.11274">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Formation of cellular/lamellar nanostructure in Sm$_2$Co$_{17}$-type binary and ternary Sm-Co-Zr magnets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Polin%2C+N">Nikita Polin</a>, <a href="/search/cond-mat?searchtype=author&query=Skokov%2C+K+P">Konstantin P. Skokov</a>, <a href="/search/cond-mat?searchtype=author&query=Aubert%2C+A">Alex Aubert</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Hongguo Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Ekitli%2C+B">Bur莽ak Ekitli</a>, <a href="/search/cond-mat?searchtype=author&query=Adabifiroozjaei%2C+E">Esmaeil Adabifiroozjaei</a>, <a href="/search/cond-mat?searchtype=author&query=Molina-Luna%2C+L">Leopoldo Molina-Luna</a>, <a href="/search/cond-mat?searchtype=author&query=Gutfleisch%2C+O">Oliver Gutfleisch</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.11274v1-abstract-short" style="display: inline;"> 2:17 SmCo magnets with a quinary composition of Sm(Co,Cu,Fe,Zr)$_{7+未}$ are industrially relevant hard magnets used in high temperature and corrosive environments. Their complex cellular/lamellar nanostructure, consisting of ordered 2:17 phase cells, 1:5 phase cell boundaries and Z-phase (Zr-rich) lamellae, is essential for their high coercivity. However, the system's complexity makes it challengi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.11274v1-abstract-full').style.display = 'inline'; document.getElementById('2410.11274v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.11274v1-abstract-full" style="display: none;"> 2:17 SmCo magnets with a quinary composition of Sm(Co,Cu,Fe,Zr)$_{7+未}$ are industrially relevant hard magnets used in high temperature and corrosive environments. Their complex cellular/lamellar nanostructure, consisting of ordered 2:17 phase cells, 1:5 phase cell boundaries and Z-phase (Zr-rich) lamellae, is essential for their high coercivity. However, the system's complexity makes it challenging to determine the contribution of each element or microstructural feature to coercivity. To disentangle the microstructure-property relationships, we simplified the system to binary and ternary SmCo$_{7.7-x}$Zr$_x$ (with $x = 0$ and 0.1) magnets and conducted detailed micro- to atomic-scale analyses. Only Zr-containing magnets formed a cellular/lamellar nanostructure akin to industrial magnets, in Zr-rich regions with at least 1 at.% Zr, but without achieving high coercivity due to low elemental gradients in absence of Cu across cell boundaries. Data from Zr-poor areas of SmCo$_{7.6}$Zr$_{0.1}$ suggests that 2:17 phase twin boundaries facilitate cellular nanostructure formation by providing inhomogeneities for heterogeneous nucleation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.11274v1-abstract-full').style.display = 'none'; document.getElementById('2410.11274v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.06540">arXiv:2410.06540</a> <span> [<a href="https://arxiv.org/pdf/2410.06540">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Understanding High Coercivity in ThMn12-Type Sm-Zr-Fe-Co-Ti Permanent Magnet Powders through Nanoscale Analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Polin%2C+N">Nikita Polin</a>, <a href="/search/cond-mat?searchtype=author&query=Gabay%2C+A+M">Alexander M. Gabay</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+C">Chaoya Han</a>, <a href="/search/cond-mat?searchtype=author&query=Chan%2C+C">Christopher Chan</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Ni%2C+C">Chaoyang Ni</a>, <a href="/search/cond-mat?searchtype=author&query=Gutfleisch%2C+O">Oliver Gutfleisch</a>, <a href="/search/cond-mat?searchtype=author&query=Hadjipanayis%2C+G+C">George C. Hadjipanayis</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.06540v1-abstract-short" style="display: inline;"> ThMn12-type (Sm,Zr)1(Fe,Co,Ti)12 compounds show great potential for permanent magnets. Magnetically hard anisotropic powders prepared via reduction-diffusion exhibit a significant increase in coercivity from 0.45 T to 1.26 T as the processing temperature is raised from 990掳C to 1220掳C. Structural and microchemical analyses at high-resolution reveal that high-temperature processing annihilates grai… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.06540v1-abstract-full').style.display = 'inline'; document.getElementById('2410.06540v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.06540v1-abstract-full" style="display: none;"> ThMn12-type (Sm,Zr)1(Fe,Co,Ti)12 compounds show great potential for permanent magnets. Magnetically hard anisotropic powders prepared via reduction-diffusion exhibit a significant increase in coercivity from 0.45 T to 1.26 T as the processing temperature is raised from 990掳C to 1220掳C. Structural and microchemical analyses at high-resolution reveal that high-temperature processing annihilates grain boundaries (GBs) and reduces the density of twin boundaries (TBs), which are defects acting as weak links limiting the coercivity in the 1:12 system. Ostwald ripening is proposed as the mechanism behind the reduction of GB and TB densities at higher temperature, driven by the reduction in interfacial energy and enhancing atomic structural uniformity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.06540v1-abstract-full').style.display = 'none'; document.getElementById('2410.06540v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.04059">arXiv:2410.04059</a> <span> [<a href="https://arxiv.org/pdf/2410.04059">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> An atomic-scale view at Fe4N as hydrogen barrier material </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Albrecht%2C+A">Aleksander Albrecht</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S+Y">Sang Yoon Song</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+C">Chang-Gi Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Kr%C3%A4mer%2C+M">Mathias Kr盲mer</a>, <a href="/search/cond-mat?searchtype=author&query=Yoo%2C+S">Su-Hyun Yoo</a>, <a href="/search/cond-mat?searchtype=author&query=Hans%2C+M">Marcus Hans</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+Y">Yan Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a>, <a href="/search/cond-mat?searchtype=author&query=Sohn%2C+S">Seok-Su Sohn</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+Y">Yonghyuk Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.04059v1-abstract-short" style="display: inline;"> Hydrogen, while a promising sustainable energy carrier, presents challenges such as the embrittlement of materials due to its ability to penetrate and weaken their crystal structures. Here we investigate Fe4N nitride layers, formed on iron through a cost-effective gas nitriding process, as an effective hydrogen permeation barrier. A combination of screening using advanced characterization, density… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.04059v1-abstract-full').style.display = 'inline'; document.getElementById('2410.04059v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.04059v1-abstract-full" style="display: none;"> Hydrogen, while a promising sustainable energy carrier, presents challenges such as the embrittlement of materials due to its ability to penetrate and weaken their crystal structures. Here we investigate Fe4N nitride layers, formed on iron through a cost-effective gas nitriding process, as an effective hydrogen permeation barrier. A combination of screening using advanced characterization, density functional theory calculations, and hydrogen permeation analysis reveals that a nitride layer reduces hydrogen diffusion by a factor of 20 at room temperature. This reduction is achieved by creating energetically unfavorable states due to stronger H-binding at the surface and high energy barriers for diffusion. The findings demonstrate the potential of Fe4N as a cost-efficient and easy-to-process solution to protecting metallic materials exposed to hydrogen, with great advantages for large-scale applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.04059v1-abstract-full').style.display = 'none'; document.getElementById('2410.04059v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.03167">arXiv:2408.03167</a> <span> [<a href="https://arxiv.org/pdf/2408.03167">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Stacking fault segregation imaging with analytical field ion microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Morgado%2C+F+F">F. F. Morgado</a>, <a href="/search/cond-mat?searchtype=author&query=Stephenson%2C+L+T">L. T. Stephenson</a>, <a href="/search/cond-mat?searchtype=author&query=Bhatt%2C+S">S. Bhatt</a>, <a href="/search/cond-mat?searchtype=author&query=Freysoldt%2C+C">C. Freysoldt</a>, <a href="/search/cond-mat?searchtype=author&query=Neumeier%2C+S">S. Neumeier</a>, <a href="/search/cond-mat?searchtype=author&query=Katnagallu%2C+S">S. Katnagallu</a>, <a href="/search/cond-mat?searchtype=author&query=Subramanyam%2C+A+P+A">A. P. A. Subramanyam</a>, <a href="/search/cond-mat?searchtype=author&query=Pietka%2C+I">I. Pietka</a>, <a href="/search/cond-mat?searchtype=author&query=Hammerschmidt%2C+T">T. Hammerschmidt</a>, <a href="/search/cond-mat?searchtype=author&query=Vurpillot%2C+F">F. Vurpillot</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">B. Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.03167v1-abstract-short" style="display: inline;"> Stacking faults (SF) are important structural defects that play an essential role in the deformation of engineering alloys. However, direct observation of stacking faults at the atomic scale can be challenging. Here, we use the analytical field ion microscopy (aFIM), including density-functional theory informed contrast estimation, to image local elemental segregation at SFs in a creep-deformed so… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.03167v1-abstract-full').style.display = 'inline'; document.getElementById('2408.03167v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.03167v1-abstract-full" style="display: none;"> Stacking faults (SF) are important structural defects that play an essential role in the deformation of engineering alloys. However, direct observation of stacking faults at the atomic scale can be challenging. Here, we use the analytical field ion microscopy (aFIM), including density-functional theory informed contrast estimation, to image local elemental segregation at SFs in a creep-deformed solid solution single crystal alloy of Ni-2 at.% W. The segregated atoms are imaged brightly, and time-of-flight spectrometry allows for their identification as W. We also provide the first quantitative analysis of trajectory aberration, with a deviation of approximately 0.4 nm, explaining why atom probe tomography could not resolve these segregations. Atomistic simulations of substitutional W atoms at an edge dislocation in fcc Ni using an analytic bond-order potential indicate that the experimentally observed segregation is due to the energetic preference of W for the center of the stacking fault, contrasting with e.g., Re segregating to partial dislocations. Solute segregation to SF can hinder dislocation motion, increasing the strength of Ni-based superalloys. Yet direct substitution of Re by W envisaged to lower superalloys' costs, requires extra consideration in alloy design since these two solutes do not have comparable interactions with structural defects during deformation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.03167v1-abstract-full').style.display = 'none'; document.getElementById('2408.03167v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.09374">arXiv:2407.09374</a> <span> [<a href="https://arxiv.org/pdf/2407.09374">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Grain boundaries control lithiation of solid solution substrates in lithium metal batteries </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo Shoji Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Jung%2C+C">Chanwon Jung</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Siyuan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=B%C3%BCy%C3%BCkuslu%2C+%C3%96+K">脰mer K. B眉y眉kuslu</a>, <a href="/search/cond-mat?searchtype=author&query=Yadav%2C+P">Poonam Yadav</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+M+P">Mahander Pratap Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xinren Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E">Eric Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Scheu%2C+C">Christina Scheu</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.09374v1-abstract-short" style="display: inline;"> The development of sustainable transportation and communication systems requires an increase in both energy density and capacity retention of Li-batteries. Using substrates forming a solid solution with body centered cubic Li enhances the cycle stability of anode-less batteries. However, it remains unclear how the substrate microstructure affects the lithiation behavior. Here, we deploy a correlat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.09374v1-abstract-full').style.display = 'inline'; document.getElementById('2407.09374v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.09374v1-abstract-full" style="display: none;"> The development of sustainable transportation and communication systems requires an increase in both energy density and capacity retention of Li-batteries. Using substrates forming a solid solution with body centered cubic Li enhances the cycle stability of anode-less batteries. However, it remains unclear how the substrate microstructure affects the lithiation behavior. Here, we deploy a correlative, near-atomic scale probing approach through combined ion- and electron-microscopy to examine the distribution of Li in Li-Ag diffusion couples as model system. We reveal that Li regions with over 93.8% at.% nucleate within Ag at random high angle grain boundaries, whereas grain interiors are not lithiated. We evidence the role of kinetics and mechanical constraint from the microstructure over equilibrium thermodynamics in dictating the lithiation process. The findings suggest that grain size and grain boundary character are critical to enhance the electrochemical performance of interlayers/electrodes, particularly for improving lithiation kinetics and hence reducing dendrite formation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.09374v1-abstract-full').style.display = 'none'; document.getElementById('2407.09374v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.03763">arXiv:2407.03763</a> <span> [<a href="https://arxiv.org/pdf/2407.03763">pdf</a>, <a href="https://arxiv.org/format/2407.03763">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.ijhydene.2024.11.166">10.1016/j.ijhydene.2024.11.166 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Segregation at prior austenite grain boundaries: the competition between boron and hydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hachet%2C+G">Guillaume Hachet</a>, <a href="/search/cond-mat?searchtype=author&query=Tehranchi%2C+A">Ali Tehranchi</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+H">Hao Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Prabhakar%2C+M">Manoj Prabhakar</a>, <a href="/search/cond-mat?searchtype=author&query=Wei%2C+S">Shaolou Wei</a>, <a href="/search/cond-mat?searchtype=author&query=Angenendt%2C+K">Katja Angenendt</a>, <a href="/search/cond-mat?searchtype=author&query=Zaefferer%2C+S">Stefan Zaefferer</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+B">Binhan Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Ponge%2C+D">Dirk Ponge</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.03763v3-abstract-short" style="display: inline;"> The interaction between boron and hydrogen at grain boundaries has been investigated experimentally and numerically in boron-doped and boron-free martensitic steels using thermal desorption spectrometry (TDS) and ab initio calculations. The calculations show that boron and hydrogen are attracted to grain boundaries but boron can repel hydrogen. This behavior has also been observed using TDS measur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.03763v3-abstract-full').style.display = 'inline'; document.getElementById('2407.03763v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.03763v3-abstract-full" style="display: none;"> The interaction between boron and hydrogen at grain boundaries has been investigated experimentally and numerically in boron-doped and boron-free martensitic steels using thermal desorption spectrometry (TDS) and ab initio calculations. The calculations show that boron and hydrogen are attracted to grain boundaries but boron can repel hydrogen. This behavior has also been observed using TDS measurements, with the disappearance of one peak when boron is incorporated into the microstructure. Additionally, the microstructure of both steels has been studied through electron backscattered diffraction, electron channeling contrast imaging, synchrotron X-ray measurements, and atom probe tomography. While they have a similar grain size, grain boundary distribution, and dislocation densities, a pronounced boron segregation into PAGBs is observed for boron-doped steels. Then, the equilibrium hydrogen concentration in different trapping sites has been evaluated using the Langmuir-McLean approximation. This thermodynamic model shows that the distribution of hydrogen is identical for all traps when the total hydrogen concentration is low for boron-free steel. However, when it increases, traps of the lowest segregation energies (mostly PAGBs) are firstly saturated, which promotes failure initiation at this defect type. This finding partially explains why PAGBs are the weakest microstructure feature when martensitic steels are exposed to hydrogen-containing environments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.03763v3-abstract-full').style.display = 'none'; document.getElementById('2407.03763v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Pre-printed version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> International Journal of Hydrogen Energy 95 (2024), 734-746 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.13158">arXiv:2405.13158</a> <span> [<a href="https://arxiv.org/pdf/2405.13158">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Towards establishing best practice in the analysis of hydrogen and deuterium by atom probe tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Saksena%2C+A">Aparna Saksena</a>, <a href="/search/cond-mat?searchtype=author&query=Sauvage%2C+X">Xavier Sauvage</a>, <a href="/search/cond-mat?searchtype=author&query=Bagot%2C+P">Paul Bagot</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo S. Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Arlt%2C+J">Jonas Arlt</a>, <a href="/search/cond-mat?searchtype=author&query=Belkacemi%2C+L+T">Lisa T. Belkacemi</a>, <a href="/search/cond-mat?searchtype=author&query=Boll%2C+T">Torben Boll</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Yi-Sheng Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Daly%2C+L">Luke Daly</a>, <a href="/search/cond-mat?searchtype=author&query=Djukic%2C+M+B">Milos B. Djukic</a>, <a href="/search/cond-mat?searchtype=author&query=Douglas%2C+J+O">James O. Douglas</a>, <a href="/search/cond-mat?searchtype=author&query=Duarte%2C+M+J">Maria J. Duarte</a>, <a href="/search/cond-mat?searchtype=author&query=Felfer%2C+P+J">Peter J. Felfer</a>, <a href="/search/cond-mat?searchtype=author&query=Forbes%2C+R+G">Richard G. Forbes</a>, <a href="/search/cond-mat?searchtype=author&query=Fu%2C+J">Jing Fu</a>, <a href="/search/cond-mat?searchtype=author&query=Gardner%2C+H+M">Hazel M. Gardner</a>, <a href="/search/cond-mat?searchtype=author&query=Gemma%2C+R">Ryota Gemma</a>, <a href="/search/cond-mat?searchtype=author&query=Gerstl%2C+S+S+A">Stephan S. A. Gerstl</a>, <a href="/search/cond-mat?searchtype=author&query=Gong%2C+Y">Yilun Gong</a>, <a href="/search/cond-mat?searchtype=author&query=Hachet%2C+G">Guillaume Hachet</a>, <a href="/search/cond-mat?searchtype=author&query=Jakob%2C+S">Severin Jakob</a>, <a href="/search/cond-mat?searchtype=author&query=Jenkins%2C+B+M">Benjamin M. Jenkins</a>, <a href="/search/cond-mat?searchtype=author&query=Jones%2C+M+E">Megan E. Jones</a>, <a href="/search/cond-mat?searchtype=author&query=Khanchandani%2C+H">Heena Khanchandani</a> , et al. (20 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.13158v1-abstract-short" style="display: inline;"> As hydrogen is touted as a key player in the decarbonization of modern society, it is critical to enable quantitative H analysis at high spatial resolution, if possible at the atomic scale. Indeed, H has a known deleterious impact on the mechanical properties (strength, ductility, toughness) of most materials that can hinder their use as part of the infrastructure of a hydrogen-based economy. Enab… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.13158v1-abstract-full').style.display = 'inline'; document.getElementById('2405.13158v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.13158v1-abstract-full" style="display: none;"> As hydrogen is touted as a key player in the decarbonization of modern society, it is critical to enable quantitative H analysis at high spatial resolution, if possible at the atomic scale. Indeed, H has a known deleterious impact on the mechanical properties (strength, ductility, toughness) of most materials that can hinder their use as part of the infrastructure of a hydrogen-based economy. Enabling H mapping, including local hydrogen concentration analyses at specific microstructural features, is essential for understanding the multiple ways that H affect the properties of materials, including for instance embrittlement mechanisms and their synergies, but also spatial mapping and quantification of hydrogen isotopes is essential to accurately predict tritium inventory of future fusion power plants, ensuring their safe and efficient operation for example. Atom probe tomography (APT) has the intrinsic capabilities for detecting hydrogen (H), and deuterium (D), and in principle the capacity for performing quantitative mapping of H within a material's microstructure. Yet the accuracy and precision of H analysis by APT remain affected by the influence of residual hydrogen from the ultra-high vacuum chamber that can obscure the signal of H from within the material, along with a complex field evaporation behavior. The present article reports the essence of discussions at a focused workshop held at the Max-Planck Institute for Sustainable Materials in April 2024. The workshop was organized to pave the way to establishing best practices in reporting APT data for the analysis of H. We first summarize the key aspects of the intricacies of H analysis by APT and propose a path for better reporting of the relevant data to support interpretation of APT-based H analysis in materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.13158v1-abstract-full').style.display = 'none'; document.getElementById('2405.13158v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.16524">arXiv:2404.16524</a> <span> [<a href="https://arxiv.org/pdf/2404.16524">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> 3D deep learning for enhanced atom probe tomography analysis of nanoscale microstructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yu%2C+J">Jiwei Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Zhangwei Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Saksena%2C+A">Aparna Saksena</a>, <a href="/search/cond-mat?searchtype=author&query=Wei%2C+S">Shaolou Wei</a>, <a href="/search/cond-mat?searchtype=author&query=Wei%2C+Y">Ye Wei</a>, <a href="/search/cond-mat?searchtype=author&query=Colnaghi%2C+T">Timoteo Colnaghi</a>, <a href="/search/cond-mat?searchtype=author&query=Marek%2C+A">Andreas Marek</a>, <a href="/search/cond-mat?searchtype=author&query=Rampp%2C+M">Markus Rampp</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+M">Min Song</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yue Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.16524v1-abstract-short" style="display: inline;"> Quantitative analysis of microstructural features on the nanoscale, including precipitates, local chemical orderings (LCOs) or structural defects (e.g. stacking faults) plays a pivotal role in understanding the mechanical and physical responses of engineering materials. Atom probe tomography (APT), known for its exceptional combination of chemical sensitivity and sub-nanometer resolution, primaril… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.16524v1-abstract-full').style.display = 'inline'; document.getElementById('2404.16524v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.16524v1-abstract-full" style="display: none;"> Quantitative analysis of microstructural features on the nanoscale, including precipitates, local chemical orderings (LCOs) or structural defects (e.g. stacking faults) plays a pivotal role in understanding the mechanical and physical responses of engineering materials. Atom probe tomography (APT), known for its exceptional combination of chemical sensitivity and sub-nanometer resolution, primarily identifies microstructures through compositional segregations. However, this fails when there is no significant segregation, as can be the case for LCOs and stacking faults. Here, we introduce a 3D deep learning approach, AtomNet, designed to process APT point cloud data at the single-atom level for nanoscale microstructure extraction, simultaneously considering compositional and structural information. AtomNet is showcased in segmenting L12-type nanoprecipitates from the matrix in an AlLiMg alloy, irrespective of crystallographic orientations, which outperforms previous methods. AtomNet also allows for 3D imaging of L10-type LCOs in an AuCu alloy, a challenging task for conventional analysis due to their small size and subtle compositional differences. Finally, we demonstrate the use of AtomNet for revealing 2D stacking faults in a Co-based superalloy, without any defected training data, expanding the capabilities of APT for automated exploration of hidden microstructures. AtomNet pushes the boundaries of APT analysis, and holds promise in establishing precise quantitative microstructure-property relationships across a diverse range of metallic materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.16524v1-abstract-full').style.display = 'none'; document.getElementById('2404.16524v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.02557">arXiv:2404.02557</a> <span> [<a href="https://arxiv.org/pdf/2404.02557">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Crystallographic dependence of Field Evaporation Energy Barrier in metals using Field Evaporation Energy Loss Spectroscopy mapping </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Vurpillot%2C+F">Fran莽ois Vurpillot</a>, <a href="/search/cond-mat?searchtype=author&query=Hatzoglou%2C+C">Constantinos Hatzoglou</a>, <a href="/search/cond-mat?searchtype=author&query=Klaes%2C+B">Benjamin Klaes</a>, <a href="/search/cond-mat?searchtype=author&query=Rousseau%2C+L">Loic Rousseau</a>, <a href="/search/cond-mat?searchtype=author&query=Maillet%2C+J">Jean-Baptiste Maillet</a>, <a href="/search/cond-mat?searchtype=author&query=Blum%2C+I">Ivan Blum</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Cerezo%2C+A">Alfred Cerezo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.02557v1-abstract-short" style="display: inline;"> Atom probe tomography data is composed of a list of coordinates of the reconstructed atoms in the probed volume. The elemental identity of each atom is derived from time-of-flight mass spectrometry, with no local energetic or chemical information readily available within the mass spectrum. Here, we used a new data processing technique referred to as field evaporation energy loss spectroscopy (FEEL… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.02557v1-abstract-full').style.display = 'inline'; document.getElementById('2404.02557v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.02557v1-abstract-full" style="display: none;"> Atom probe tomography data is composed of a list of coordinates of the reconstructed atoms in the probed volume. The elemental identity of each atom is derived from time-of-flight mass spectrometry, with no local energetic or chemical information readily available within the mass spectrum. Here, we used a new data processing technique referred to as field evaporation energy loss spectroscopy (FEELS), which analyses the tails of mass peaks. FEELS was used to extract critical energetic parameters that characterize the field evaporation process, which are related to the binding energy of atoms to the surface under intense electrostatic field and dependent of the path followed by the departing atoms during the field evaporation process. We focused our study on different pure face centered cubic metals (Al, Ni, Rh). We demonstrate that the energetic parameters extracted from mass spectra can be mapped in 2D with nanometric resolution. A dependence on the considered crystallographic planes is observed, with sets of planes of low Miller indices showing a lower sensitivity to the intensity of the electric field, which indicates a lower effective attachment energy. The temperature is also an important parameter in particular for Al, which we attribute to an energetic transition between two paths of field evaporation between 25K and 60K close to (002) pole at the specimen's surface. This paper shows that the complex information that can be retrieved from the measured energy loss of surface atoms is important both instrumentally and fundamentally. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.02557v1-abstract-full').style.display = 'none'; document.getElementById('2404.02557v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.03480">arXiv:2403.03480</a> <span> [<a href="https://arxiv.org/pdf/2403.03480">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Impurities, or dopants, that is the question </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo Shoji Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Kr%C3%A4mer%2C+M">Mathias Kr盲mer</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.03480v1-abstract-short" style="display: inline;"> The numerous stories around LK-99 as a possible room-temperature superconductor over the summer of 2023 epitomise that materials are more than a bulk crystallographic structure or an expected composition. Like all materials, those at the core of technologies for the energy generation transition, including batteries, catalysts or quantum materials draw their properties from a hierarchy of microstru… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03480v1-abstract-full').style.display = 'inline'; document.getElementById('2403.03480v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.03480v1-abstract-full" style="display: none;"> The numerous stories around LK-99 as a possible room-temperature superconductor over the summer of 2023 epitomise that materials are more than a bulk crystallographic structure or an expected composition. Like all materials, those at the core of technologies for the energy generation transition, including batteries, catalysts or quantum materials draw their properties from a hierarchy of microstructural features where impurities can dramatically influence the outcomes. As we move towards a circular economy, the recycling of materials will inevitably create fluxes of increasingly impure materials, generating new challenges for fabricating materials with controlled properties. Here, we provide our perspective on how high-end microscopy and microanalysis have helped us to understand relationships between synthesis, processing and microstructure, avoiding imprecise or even erroneous interpretations on the origins of the properties from a range of materials. We highlight examples of how unexpected impurities and their spatial distribution on the nanoscale can be turned into an advantage to define pathways for synthesis of materials with new and novel sets of physical properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03480v1-abstract-full').style.display = 'none'; document.getElementById('2403.03480v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.10932">arXiv:2402.10932</a> <span> [<a href="https://arxiv.org/pdf/2402.10932">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Roadmap on Data-Centric Materials Science </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bauer%2C+S">Stefan Bauer</a>, <a href="/search/cond-mat?searchtype=author&query=Benner%2C+P">Peter Benner</a>, <a href="/search/cond-mat?searchtype=author&query=Bereau%2C+T">Tristan Bereau</a>, <a href="/search/cond-mat?searchtype=author&query=Blum%2C+V">Volker Blum</a>, <a href="/search/cond-mat?searchtype=author&query=Boley%2C+M">Mario Boley</a>, <a href="/search/cond-mat?searchtype=author&query=Carbogno%2C+C">Christian Carbogno</a>, <a href="/search/cond-mat?searchtype=author&query=Catlow%2C+C+R+A">C. Richard A. Catlow</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Eibl%2C+S">Sebastian Eibl</a>, <a href="/search/cond-mat?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/cond-mat?searchtype=author&query=Fekete%2C+%C3%81">脕d谩m Fekete</a>, <a href="/search/cond-mat?searchtype=author&query=Foppa%2C+L">Lucas Foppa</a>, <a href="/search/cond-mat?searchtype=author&query=Fratzl%2C+P">Peter Fratzl</a>, <a href="/search/cond-mat?searchtype=author&query=Freysoldt%2C+C">Christoph Freysoldt</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Ghiringhelli%2C+L+M">Luca M. Ghiringhelli</a>, <a href="/search/cond-mat?searchtype=author&query=Giri%2C+S+K">Sajal K. Giri</a>, <a href="/search/cond-mat?searchtype=author&query=Gladyshev%2C+A">Anton Gladyshev</a>, <a href="/search/cond-mat?searchtype=author&query=Goyal%2C+P">Pawan Goyal</a>, <a href="/search/cond-mat?searchtype=author&query=Hattrick-Simpers%2C+J">Jason Hattrick-Simpers</a>, <a href="/search/cond-mat?searchtype=author&query=Kabalan%2C+L">Lara Kabalan</a>, <a href="/search/cond-mat?searchtype=author&query=Karpov%2C+P">Petr Karpov</a>, <a href="/search/cond-mat?searchtype=author&query=Khorrami%2C+M+S">Mohammad S. Khorrami</a>, <a href="/search/cond-mat?searchtype=author&query=Koch%2C+C">Christoph Koch</a>, <a href="/search/cond-mat?searchtype=author&query=Kokott%2C+S">Sebastian Kokott</a> , et al. (36 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.10932v3-abstract-short" style="display: inline;"> Science is and always has been based on data, but the terms "data-centric" and the "4th paradigm of" materials research indicate a radical change in how information is retrieved, handled and research is performed. It signifies a transformative shift towards managing vast data collections, digital repositories, and innovative data analytics methods. The integration of Artificial Intelligence (AI) a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.10932v3-abstract-full').style.display = 'inline'; document.getElementById('2402.10932v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.10932v3-abstract-full" style="display: none;"> Science is and always has been based on data, but the terms "data-centric" and the "4th paradigm of" materials research indicate a radical change in how information is retrieved, handled and research is performed. It signifies a transformative shift towards managing vast data collections, digital repositories, and innovative data analytics methods. The integration of Artificial Intelligence (AI) and its subset Machine Learning (ML), has become pivotal in addressing all these challenges. This Roadmap on Data-Centric Materials Science explores fundamental concepts and methodologies, illustrating diverse applications in electronic-structure theory, soft matter theory, microstructure research, and experimental techniques like photoemission, atom probe tomography, and electron microscopy. While the roadmap delves into specific areas within the broad interdisciplinary field of materials science, the provided examples elucidate key concepts applicable to a wider range of topics. The discussed instances offer insights into addressing the multifaceted challenges encountered in contemporary materials research. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.10932v3-abstract-full').style.display = 'none'; document.getElementById('2402.10932v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Review, outlook, roadmap, perspective</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.04608">arXiv:2402.04608</a> <span> [<a href="https://arxiv.org/pdf/2402.04608">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/mam/ozae062">10.1093/mam/ozae062 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analysis of water ice in nanoporous copper needles using cryo atom probe tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tegg%2C+L">Levi Tegg</a>, <a href="/search/cond-mat?searchtype=author&query=McCarroll%2C+I+E">Ingrid E. McCarroll</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Dubosq%2C+R">Renelle Dubosq</a>, <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E+V">Eric V. Woods</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A+A">Ayman A. El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Cairney%2C+J+M">Julie M. Cairney</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.04608v1-abstract-short" style="display: inline;"> The application of atom probe tomography (APT) to frozen liquids is limited by difficulties in specimen preparation. Here, we report on the use of nanoporous Cu needles as a physical framework to hold water ice for investigation using APT. Nanoporous Cu needles are prepared by the electropolishing and dealloying of Cu-Mn matchstick precursors. Cryogenic scanning electron microscopy and focused-ion… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.04608v1-abstract-full').style.display = 'inline'; document.getElementById('2402.04608v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.04608v1-abstract-full" style="display: none;"> The application of atom probe tomography (APT) to frozen liquids is limited by difficulties in specimen preparation. Here, we report on the use of nanoporous Cu needles as a physical framework to hold water ice for investigation using APT. Nanoporous Cu needles are prepared by the electropolishing and dealloying of Cu-Mn matchstick precursors. Cryogenic scanning electron microscopy and focused-ion beam milling reveal a hierarchical, dendritic, highly-wettable microstructure. The atom probe mass spectrum is dominated by peaks of Cu+ and H(H2O)n+ up to n <= 3, and the reconstructed volume shows the protrusion of a Cu ligament into an ice-filled pore. The continuous Cu ligament network electrically connects the apex to the cryostage, leading to enhanced electric field at the apex and increased cooling, both of which simplify the mass spectrum compared to previous reports. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.04608v1-abstract-full').style.display = 'none'; document.getElementById('2402.04608v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.12784">arXiv:2401.12784</a> <span> [<a href="https://arxiv.org/pdf/2401.12784">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Understanding atom probe's analytical performance for iron oxides using correlation histograms and ab initio calculations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Bhatt%2C+S">Shalini Bhatt</a>, <a href="/search/cond-mat?searchtype=author&query=Schreiber%2C+D+K">Daniel K. Schreiber</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+J">J枚rg Neugebauer</a>, <a href="/search/cond-mat?searchtype=author&query=Freysoldt%2C+C">Christoph Freysoldt</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Katnagallu%2C+S">Shyam Katnagallu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.12784v1-abstract-short" style="display: inline;"> Field evaporation from ionic or covalently bonded materials often leads to the emission of molecular ions. The metastability of these molecular ions, particularly under the influence of the intense electrostatic field (1010 Vm-1), makes them prone to dissociation with or without an exchange of energy amongst them. These processes can affect the analytical performance of atom probe tomography (APT)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.12784v1-abstract-full').style.display = 'inline'; document.getElementById('2401.12784v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.12784v1-abstract-full" style="display: none;"> Field evaporation from ionic or covalently bonded materials often leads to the emission of molecular ions. The metastability of these molecular ions, particularly under the influence of the intense electrostatic field (1010 Vm-1), makes them prone to dissociation with or without an exchange of energy amongst them. These processes can affect the analytical performance of atom probe tomography (APT). For instance, neutral species formed through dissociation may not be detected at all or with a time of flight no longer related to their mass, causing their loss from the analysis. Here, we evaluated the changes in the measured composition of FeO, Fe2O3 and Fe3O4 across a wide range of analysis conditions. Possible dissociation reactions are predicted by density-functional theory (DFT) calculations considering the spin states of the molecules. The energetically favoured reactions are traced on to the multi-hit ion correlation histograms, to confirm their existence within experiments, using an automated Python-based routine. The detected reactions are carefully analysed to reflect upon the influence of these neutrals from dissociation reactions on the performance of APT for analysing iron oxides. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.12784v1-abstract-full').style.display = 'none'; document.getElementById('2401.12784v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.12235">arXiv:2312.12235</a> <span> [<a href="https://arxiv.org/pdf/2312.12235">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> On the role of Grain Boundary Character in the Stress Corrosion Cracking of Nanoporous Gold Thin Films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Saksena%2C+A">Aparna Saksena</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A">Ayman El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Saxena%2C+A">Alaukik Saxena</a>, <a href="/search/cond-mat?searchtype=author&query=Hatipoglu%2C+E">Ezgi Hatipoglu</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+J+M">Jochen M. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.12235v1-abstract-short" style="display: inline;"> For its potential as a catalyst, nanoporous gold (NPG) prepared through dealloying of bulk Ag-Au alloys has been extensively investigated. NPG thin films can offer ease of handling, better tunability of the chemistry and microstructure of the nanoporous structure, and represent a more sustainable usage of scarce resources. These films are however prone to intergranular cracking during dealloying,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.12235v1-abstract-full').style.display = 'inline'; document.getElementById('2312.12235v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.12235v1-abstract-full" style="display: none;"> For its potential as a catalyst, nanoporous gold (NPG) prepared through dealloying of bulk Ag-Au alloys has been extensively investigated. NPG thin films can offer ease of handling, better tunability of the chemistry and microstructure of the nanoporous structure, and represent a more sustainable usage of scarce resources. These films are however prone to intergranular cracking during dealloying, limiting their stability and potential applications. Here, we set out to systematically investigate the grain boundaries in Au28Ag72 thin films. We observe that a sample synthesized at 400 掳C is at least 2.5 times less prone to cracking compared to a sample synthesized at room temperature. This correlates with a higher density of coincident site lattice grain boundaries, especially the density of coherent sigma 3, increased, which appear resistant against cracking. Nanoscale compositional analysis of random high-angle grain boundaries reveals prominent Ag enrichment up to 77 at.%, whereas sigma 3 coherent twin boundaries show Au enrichment of up to 30 at.%. The misorientation and the chemistry of grain boundaries hence affect their dealloying behavior, which in turn controls the cracking, and the possible longevity of NPG thin films for application in electrocatalysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.12235v1-abstract-full').style.display = 'none'; document.getElementById('2312.12235v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.18688">arXiv:2311.18688</a> <span> [<a href="https://arxiv.org/pdf/2311.18688">pdf</a>, <a href="https://arxiv.org/format/2311.18688">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/mam/ozae035">10.1093/mam/ozae035 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Facilitating Atom Probe Tomography of 2D MXene Films by In Situ Sputtering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kr%C3%A4mer%2C+M">Mathias Kr盲mer</a>, <a href="/search/cond-mat?searchtype=author&query=Favelukis%2C+B">Bar Favelukis</a>, <a href="/search/cond-mat?searchtype=author&query=Sokol%2C+M">Maxim Sokol</a>, <a href="/search/cond-mat?searchtype=author&query=Rosen%2C+B+A">Brian A. Rosen</a>, <a href="/search/cond-mat?searchtype=author&query=Eliaz%2C+N">Noam Eliaz</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.18688v1-abstract-short" style="display: inline;"> 2D materials are emerging as promising nanomaterials for applications in energy storage and catalysis. In the wet chemical synthesis of MXenes, these 2D transition metal carbides and nitrides are terminated with a variety of functional groups, and cations such as Li+ are often used to intercalate into the structure to obtain exfoliated nanosheets. Given the various elements involved in their synth… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.18688v1-abstract-full').style.display = 'inline'; document.getElementById('2311.18688v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.18688v1-abstract-full" style="display: none;"> 2D materials are emerging as promising nanomaterials for applications in energy storage and catalysis. In the wet chemical synthesis of MXenes, these 2D transition metal carbides and nitrides are terminated with a variety of functional groups, and cations such as Li+ are often used to intercalate into the structure to obtain exfoliated nanosheets. Given the various elements involved in their synthesis, it is crucial to determine the detailed chemical composition of the final product, in order to better assess and understand the relationships between composition and properties of these materials. To facilitate atom probe tomography analysis of these materials, a revised specimen preparation method is presented in this study. A colloidal Ti3C2Tz MXene solution was processed into an additive-free free-standing film and specimens were prepared using a dual beam scanning electron microscope / focused ion beam. To mechanically stabilize the fragile specimens, they were coated using an in situ sputtering technique. As various 2D material inks can be processed into such free-standing films, the presented approach is pivotal for enabling atom probe analysis of other 2D materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.18688v1-abstract-full').style.display = 'none'; document.getElementById('2311.18688v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.13224">arXiv:2311.13224</a> <span> [<a href="https://arxiv.org/pdf/2311.13224">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Nanoporous gold thin films as substrates to analyze liquids by cryo-atom probe tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E+V">E. V. Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Saksena%2C+A">A. Saksena</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A+A">A. A. El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Stephenson%2C+L+T">L. T. Stephenson</a>, <a href="/search/cond-mat?searchtype=author&query=Schwarz%2C+T+M">T. M. Schwarz</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+M+P">M. P. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">L. S. Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S+-">S. -H. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+J">J. Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">B. Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.13224v1-abstract-short" style="display: inline;"> Cryogenic atom probe tomography (cryo-APT) is being developed to enable nanoscale compositional analyses of frozen liquids. Yet, the availability of readily available substrates that allow for the fixation of liquids while providing sufficient strength to their interface, is still an issue. Here we propose the use of 1-2 microns thick binary alloy film of gold-silver (AuAg) sputtered onto flat sil… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.13224v1-abstract-full').style.display = 'inline'; document.getElementById('2311.13224v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.13224v1-abstract-full" style="display: none;"> Cryogenic atom probe tomography (cryo-APT) is being developed to enable nanoscale compositional analyses of frozen liquids. Yet, the availability of readily available substrates that allow for the fixation of liquids while providing sufficient strength to their interface, is still an issue. Here we propose the use of 1-2 microns thick binary alloy film of gold-silver (AuAg) sputtered onto flat silicon, with sufficient adhesion without an additional layer. Through chemical dealloying, we successfully fabricate a nanoporous substrate, with open-pore structure, which is mounted on a microarray of Si posts by lift out in the focused-ion beam, allowing for cryogenic fixation of liquids. We present cryo-APT results obtained after cryogenic sharpening, vacuum cryo-transfer and analysis of pure water on top and inside the nanoporous film. We demonstrate that this new substrate has the requisite characteristics for facilitating cryo-APT of frozen liquids, with a relatively lower volume of precious metals. This complete workflow represents an improved approach for frozen liquid analysis, from preparation of the films to the successful fixation of the liquid in the porous network, to cryo-atom probe tomography. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.13224v1-abstract-full').style.display = 'none'; document.getElementById('2311.13224v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.20017">arXiv:2310.20017</a> <span> [<a href="https://arxiv.org/pdf/2310.20017">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Direct imaging of spatial heterogeneities in type II superconductors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Evans%2C+D+M">Donald M. Evans</a>, <a href="/search/cond-mat?searchtype=author&query=Conroy%2C+M">Michele Conroy</a>, <a href="/search/cond-mat?searchtype=author&query=Puntigam%2C+L">Lukas Puntigam</a>, <a href="/search/cond-mat?searchtype=author&query=Croitori%2C+D">Dorina Croitori</a>, <a href="/search/cond-mat?searchtype=author&query=Prodan%2C+L">Lilian Prodan</a>, <a href="/search/cond-mat?searchtype=author&query=Douglas%2C+J+O">James O. Douglas</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Tsurkan%2C+V">Vladimir Tsurkan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.20017v1-abstract-short" style="display: inline;"> Understanding the exotic properties of quantum materials, including high-temperature superconductors, remains a formidable challenge that demands direct insights into electronic conductivity. Current methodologies either capture a bulk average or near-atomically-resolved information, missing direct measurements at the critical intermediate length scales. Here, using the superconductor Fe(Se,Te) as… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.20017v1-abstract-full').style.display = 'inline'; document.getElementById('2310.20017v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.20017v1-abstract-full" style="display: none;"> Understanding the exotic properties of quantum materials, including high-temperature superconductors, remains a formidable challenge that demands direct insights into electronic conductivity. Current methodologies either capture a bulk average or near-atomically-resolved information, missing direct measurements at the critical intermediate length scales. Here, using the superconductor Fe(Se,Te) as a model system, we use low-temperature conductive atomic force microscopy (cAFM) to bridge this gap. Contrary to the uniform superconductivity anticipated from bulk assessments, cAFM uncovers micron-scale conductive intrusions within a relatively insulating matrix. Subsequent compositional mapping through atom probe tomography, shows that differences in conductivity correlated with local changes in composition. cAFM, supported by advanced microscopy and microanalysis, represents a methodological breakthrough that can be used to navigate the intricate landscape of high-temperature superconductors and the broader realm of quantum materials. Such fundamental information is critical for theoretical understanding and future guided design. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.20017v1-abstract-full').style.display = 'none'; document.getElementById('2310.20017v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.09120">arXiv:2310.09120</a> <span> [<a href="https://arxiv.org/pdf/2310.09120">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.ijhydene.2023.09.057">10.1016/j.ijhydene.2023.09.057 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimizing site-specific specimen preparation for Atom Probe Tomography by using hydrogen for visualizing radiation-induced damage </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Saksena%2C+A">Aparna Saksena</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+B">Binhan Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Dong%2C+X">Xizhen Dong</a>, <a href="/search/cond-mat?searchtype=author&query=Khanchandani%2C+H">Heena Khanchandani</a>, <a href="/search/cond-mat?searchtype=author&query=Ponge%2C+D">Dirk Ponge</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.09120v1-abstract-short" style="display: inline;"> Atom probe tomography (APT) is extensively used to measure the local chemistry of materials. Site-specific preparation via a focused ion beam (FIB) is routinely implemented to fabricate needle-shaped specimens with an end radius in the range of 50 nm. This preparation route is sometimes supplemented by transmission Kikuchi diffraction (TKD) to facilitate the positioning of a region of interest suf… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.09120v1-abstract-full').style.display = 'inline'; document.getElementById('2310.09120v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.09120v1-abstract-full" style="display: none;"> Atom probe tomography (APT) is extensively used to measure the local chemistry of materials. Site-specific preparation via a focused ion beam (FIB) is routinely implemented to fabricate needle-shaped specimens with an end radius in the range of 50 nm. This preparation route is sometimes supplemented by transmission Kikuchi diffraction (TKD) to facilitate the positioning of a region of interest sufficiently close to the apex. Irradiating the specimen with energetic electrons and ions can lead to the generation of vacancies and even amorphization of the specimen. These extrinsically created vacancies become crucial for probing the hydrogen or deuterium distribution since they act as a strong trap. Here, we investigated the feasibility of site-specific preparation of a two-phase medium-Mn steel containing austenite (fcc) and ferrite (bcc). Following gaseous charging of APT specimens in deuterium (D2), clusters enriched by up to 35 at.% D, are imaged after Pt deposition, conventional Ga-FIB preparation, and TKD conducted separately. These D-rich clusters are assumed to arise from the agglomeration of vacancies acting as strong traps. By systematically eliminating these preparation-induced damages, we finally introduce a workflow allowing for studying intrinsic traps for H/D inherent to the material. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.09120v1-abstract-full').style.display = 'none'; document.getElementById('2310.09120v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07842">arXiv:2309.07842</a> <span> [<a href="https://arxiv.org/pdf/2309.07842">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Facilitating the systematic nanoscale study of battery materials by atom probe tomography through in-situ metal coating </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Singh%2C+M+P">Mahander P Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E+V">Eric V Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S+H">Se Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Jung%2C+C">Chanwon Jung</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo S. Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.07842v1-abstract-short" style="display: inline;"> Through its capability for 3D mapping of Li at the nanoscale, atom probe tomography (APT) is poised to play a key role in understanding the microstructural degradation of lithium-ion batteries (LIB) during successive charge and discharge cycles. However, APT application to materials for LIB is plagued by the field induced delithiation (deintercalation) of Li-ions during the analysis itself that pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07842v1-abstract-full').style.display = 'inline'; document.getElementById('2309.07842v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07842v1-abstract-full" style="display: none;"> Through its capability for 3D mapping of Li at the nanoscale, atom probe tomography (APT) is poised to play a key role in understanding the microstructural degradation of lithium-ion batteries (LIB) during successive charge and discharge cycles. However, APT application to materials for LIB is plagued by the field induced delithiation (deintercalation) of Li-ions during the analysis itself that prevents the precise assessment of the Li distribution. Here, we showcase how a thin Cr-coating, in-situ formed on APT specimens of NMC811 in the focused-ion beam (FIB), preserves the sample's integrity and circumvent this deleterious delithiation. Cr-coated specimens demonstrated remarkable improvements in data quality and virtually eliminated premature specimen failures, allowing for more precise measurements via. improved statistics. Through improved data analysis, we reveal substantial cation fluctuations in commercial grade NMC811, including complete grains of LiMnO. The current methodology stands out for its simplicity and cost-effectiveness and is a viable approach to prepare battery cathodes and anodes for systematic APT studies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07842v1-abstract-full').style.display = 'none'; document.getElementById('2309.07842v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07836">arXiv:2309.07836</a> <span> [<a href="https://arxiv.org/pdf/2309.07836">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> In-situ metallic coating of atom probe specimen for enhanced yield, performance, and increased field-of-view </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Schwarz%2C+T+M">Tim M. Schwarz</a>, <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E">Eric Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+M+P">Mahander P. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Jung%2C+C">Chanwon Jung</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo S. Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Jang%2C+K">Kyuseon Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Kr%C3%A4mer%2C+M">Mathias Kr盲mer</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=McCarroll%2C+I">Ingrid McCarroll</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.07836v2-abstract-short" style="display: inline;"> Atom probe tomography requires needle-shaped specimens with a diameter typically below 100 nm, making them both very fragile and reactive, and defects (notches at grain boundaries or precipitates) are known to affect the yield and data quality. The use of a conformal coating directly on the sharpened specimen has been proposed to increase yield and reduce background. However, to date, these coatin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07836v2-abstract-full').style.display = 'inline'; document.getElementById('2309.07836v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07836v2-abstract-full" style="display: none;"> Atom probe tomography requires needle-shaped specimens with a diameter typically below 100 nm, making them both very fragile and reactive, and defects (notches at grain boundaries or precipitates) are known to affect the yield and data quality. The use of a conformal coating directly on the sharpened specimen has been proposed to increase yield and reduce background. However, to date, these coatings have been applied ex-situ and mostly are not uniformly. Here, we report on the controlled focused ion beam in-situ deposition of a thin metal film on specimens immediately after specimen preparation. Different metallic targets e.g. Cr were attached to a micromanipulator via a conventional lift-out method and sputtered using the Ga or Xe ions. We showcase the many advantages of coating specimens from metallic to non-metallic materials. We have identified an increase in data quality and yield, an improvement of the mass resolution, as well as an increase in the effective field-of-view enabling visualization of the entire original specimen, including the complete surface oxide layer. The ease of implementation of the approach makes it very attractive for generalizing its use across a very wide range of atom probe analyses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07836v2-abstract-full').style.display = 'none'; document.getElementById('2309.07836v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.16672">arXiv:2308.16672</a> <span> [<a href="https://arxiv.org/pdf/2308.16672">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> </div> </div> <p class="title is-5 mathjax"> Scalable Substrate Development for Aqueous Biological Samples for Atom Probe Tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E+V">Eric V. Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A+A">Ayman A. El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Stephenson%2C+L+T">Leigh T. Stephenson</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.16672v1-abstract-short" style="display: inline;"> Reliable and consistent preparation of atom probe tomography (APT) specimens from aqueous and hydrated biological specimens remains a significant challenge. One particularly difficult process step is the use of a focused ion beam (FIB) instrument for preparing the required needle-shaped specimen, typically involving a "lift-out" procedure of a small sample of material. Here, two alternative substr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.16672v1-abstract-full').style.display = 'inline'; document.getElementById('2308.16672v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.16672v1-abstract-full" style="display: none;"> Reliable and consistent preparation of atom probe tomography (APT) specimens from aqueous and hydrated biological specimens remains a significant challenge. One particularly difficult process step is the use of a focused ion beam (FIB) instrument for preparing the required needle-shaped specimen, typically involving a "lift-out" procedure of a small sample of material. Here, two alternative substrate designs are introduced that enable using FIB only for sharpening, along with example APT datasets. The first design is a laser-cut FIB-style half-grid close to those used for transmission-electron microscopy, that can be used in a grid holder compatible with APT pucks. The second design is a larger, standalone self-supporting substrate called a "crown", with several specimen positions that self-aligns in APT pucks, prepared by electrical discharge machining (EDM). Both designs are made nanoporous, to provide strength to the liquid-substrate interface, using chemical and vacuum dealloying. We select alpha brass a simple, widely available, lower-cost alternative to previously proposed substrates. We present the resulting designs, APT data, and provide suggestions to help drive wider community adoption. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.16672v1-abstract-full').style.display = 'none'; document.getElementById('2308.16672v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.16048">arXiv:2308.16048</a> <span> [<a href="https://arxiv.org/pdf/2308.16048">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41563-021-01050-y">10.1038/s41563-021-01050-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Chemical heterogeneity enhances hydrogen resistance in high-strength steels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Sun%2C+B">Binhan Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+W">Wenjun Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+R">Ran Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Makineni%2C+S+K">Surendra Kumar Makineni</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+C">Chun-Hung Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Wan%2C+D">Di Wan</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+H">Hao Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Ponge%2C+D">Dirk Ponge</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.16048v1-abstract-short" style="display: inline;"> When H, the lightest, smallest and most abundant atom in the universe, makes its way into a high-strength alloy (>650 MPa), the material's load-bearing capacity is abruptly lost. This phenomenon, known as H embrittlement, was responsible for the catastrophic and unpredictable failure of large engineering structures in service. The inherent antagonism between high strength requirements and H embrit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.16048v1-abstract-full').style.display = 'inline'; document.getElementById('2308.16048v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.16048v1-abstract-full" style="display: none;"> When H, the lightest, smallest and most abundant atom in the universe, makes its way into a high-strength alloy (>650 MPa), the material's load-bearing capacity is abruptly lost. This phenomenon, known as H embrittlement, was responsible for the catastrophic and unpredictable failure of large engineering structures in service. The inherent antagonism between high strength requirements and H embrittlement susceptibility strongly hinders the design of lightweight yet reliable structural components needed for carbon-free hydrogen-propelled industries and reduced-emission transportation solutions. Inexpensive and scalable alloying and microstructural solutions that enable both, an intrinsically high resilience to H and high mechanical performance, must be found. Here we introduce a counterintuitive strategy to exploit typically undesired chemical heterogeneity within the material's microstructure that allows the local enhancement of crack resistance and local H trapping, thereby enhancing the resistance against H embrittlement. We deploy this approach to a lightweight, high-strength steel and produce a high-number density Mn-rich zones dispersed within the microstructure. These solute-rich buffer regions allow for local micro-tuning of the phase stability, arresting H-induced microcracks thus interrupting the H-assisted damage evolution chain, regardless of how and when H is introduced and also regardless of the underlying embrittling mechanisms. A superior H embrittlement resistance, increased by a factor of two compared to a reference material with a homogeneous solute distribution within each microstructure constituent, is achieved at no expense of the material's strength and ductility. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.16048v1-abstract-full').style.display = 'none'; document.getElementById('2308.16048v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.05051">arXiv:2307.05051</a> <span> [<a href="https://arxiv.org/pdf/2307.05051">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Microstructure of a spark-plasma-sintered Fe2VAl-type Heusler alloy for thermoelectric application </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gomell%2C+L">Leonie Gomell</a>, <a href="/search/cond-mat?searchtype=author&query=Dirba%2C+I">Imants Dirba</a>, <a href="/search/cond-mat?searchtype=author&query=Bishara%2C+H">Hanna Bishara</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+Z">Zhongji Sun</a>, <a href="/search/cond-mat?searchtype=author&query=%C5%BBrodowski%2C+%C5%81">艁ukasz. 呕rodowski</a>, <a href="/search/cond-mat?searchtype=author&query=Choma%2C+T">Tomasz Choma</a>, <a href="/search/cond-mat?searchtype=author&query=Moro%C5%84czyk%2C+B">Bartosz Moro艅czyk</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Skokov%2C+K+P">Konstantin P. Skokov</a>, <a href="/search/cond-mat?searchtype=author&query=Gutfleisch%2C+O">Oliver Gutfleisch</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">B. Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.05051v1-abstract-short" style="display: inline;"> The influence of microstructure on thermoelectricity is increasingly recognized. Approaches for microstructural engineering can hence be exploited to enhance thermoelectric performance, particularly through manipulating crystalline defects, their structure, and composition. Here, we focus on a full-Heusler Fe2VAl-based compound that is one of the most promising thermoelectric materials containing… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.05051v1-abstract-full').style.display = 'inline'; document.getElementById('2307.05051v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.05051v1-abstract-full" style="display: none;"> The influence of microstructure on thermoelectricity is increasingly recognized. Approaches for microstructural engineering can hence be exploited to enhance thermoelectric performance, particularly through manipulating crystalline defects, their structure, and composition. Here, we focus on a full-Heusler Fe2VAl-based compound that is one of the most promising thermoelectric materials containing only Earth-abundant, non-toxic elements. A Fe2VTa0.05Al0.95 cast alloy was atomized under a nitrogen-rich atmosphere to induce nitride precipitation. Nanometer- to micrometer-scale microstructural investigations by advanced scanning electron microscopy and atom probe tomography (APT) are performed on the powder first and then on the material consolidated by spark-plasma sintering for an increasing time. APT reveals an unexpected pick-up of additional impurities from atomization, namely W and Mo. The microstructure is then correlated with local and global measurements of the thermoelectric properties. At grain boundaries, segregation and precipitation locally reduce the electrical resistivity, as evidenced by in-situ four-point probe measurements. The final microstructure contains a hierarchy of structural defects, including individual point defects, dislocations, grain boundaries, and precipitates, that allow for a strong decrease in thermal conductivity. In combination, these effects provide an appreciable increase in thermoelectric performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.05051v1-abstract-full').style.display = 'none'; document.getElementById('2307.05051v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.02884">arXiv:2306.02884</a> <span> [<a href="https://arxiv.org/pdf/2306.02884">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Crack arrest markings in stress corrosion cracking of 7xxx aluminium alloys: insights into active hydrogen embrittlement mechanisms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Freixes%2C+M+L">Mart铆 L贸pez Freixes</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Aymerich-Armengol%2C+R">Raquel Aymerich-Armengol</a>, <a href="/search/cond-mat?searchtype=author&query=Vega-Paredes%2C+M">Miquel Vega-Paredes</a>, <a href="/search/cond-mat?searchtype=author&query=Peguet%2C+L">Lionel Peguet</a>, <a href="/search/cond-mat?searchtype=author&query=Warner%2C+T">Timothy Warner</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.02884v1-abstract-short" style="display: inline;"> Crack growth in stress corrosion cracking (SCC) in 7xxx Al alloys is an intermittent process, which generates successive crack arrest markings (CAMs) visible on the fracture surface. It is conjectured that H is generated at the crack tip during crack arrest, which then facilitates crack advancement through hydrogen embrittlement. Here, nanoscale imaging by 4D-scanning-transmission electron microsc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.02884v1-abstract-full').style.display = 'inline'; document.getElementById('2306.02884v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.02884v1-abstract-full" style="display: none;"> Crack growth in stress corrosion cracking (SCC) in 7xxx Al alloys is an intermittent process, which generates successive crack arrest markings (CAMs) visible on the fracture surface. It is conjectured that H is generated at the crack tip during crack arrest, which then facilitates crack advancement through hydrogen embrittlement. Here, nanoscale imaging by 4D-scanning-transmission electron microscopy and atom probe tomography show that CAMs are produced by oxidation at the arrested crack tip, matrix precipitates dissolve and solute diffuse towards the growing CAM. Substantial homogenous residual strain remains underneath the fracture surface, indicative of non-localized plastic activity. Our study suggests that H induces crack propagation through decohesion. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.02884v1-abstract-full').style.display = 'none'; document.getElementById('2306.02884v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.19822">arXiv:2305.19822</a> <span> [<a href="https://arxiv.org/pdf/2305.19822">pdf</a>, <a href="https://arxiv.org/format/2305.19822">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/adma.202305183">10.1002/adma.202305183 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Near-Atomic Scale Perspective on the Oxidation of Ti$_3$C$_2$T$_x$ MXenes: Insights from Atom Probe Tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kr%C3%A4mer%2C+M">Mathias Kr盲mer</a>, <a href="/search/cond-mat?searchtype=author&query=Favelukis%2C+B">Bar Favelukis</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A+A">Ayman A. El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Sokol%2C+M">Maxim Sokol</a>, <a href="/search/cond-mat?searchtype=author&query=Rosen%2C+B+A">Brian A. Rosen</a>, <a href="/search/cond-mat?searchtype=author&query=Eliaz%2C+N">Noam Eliaz</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.19822v1-abstract-short" style="display: inline;"> MXenes are a family of 2D transition metal carbides and nitrides with remarkable properties and great potential for energy storage and catalysis applications. However, their oxidation behavior is not yet fully understood, and there are still open questions regarding the spatial distribution and precise quantification of surface terminations, intercalated ions, and possible uncontrolled impurities… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19822v1-abstract-full').style.display = 'inline'; document.getElementById('2305.19822v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.19822v1-abstract-full" style="display: none;"> MXenes are a family of 2D transition metal carbides and nitrides with remarkable properties and great potential for energy storage and catalysis applications. However, their oxidation behavior is not yet fully understood, and there are still open questions regarding the spatial distribution and precise quantification of surface terminations, intercalated ions, and possible uncontrolled impurities incorporated during synthesis and processing. Here, atom probe tomography analysis of as-synthesized Ti$_3$C$_2$T$_x$ MXenes reveals the presence of alkali (Li, Na) and halogen (Cl, F) elements as well as unetched Al. Following oxidation of the colloidal solution of MXenes, it is observed that the alkalies enriched in TiO$_2$ nanowires. Although these elements are tolerated through the incorporation by wet chemical synthesis, they are often overlooked when the activity of these materials is considered, particularly during catalytic testing. This work demonstrates how the capability of atom probe tomography to image these elements in 3D at the near-atomic scale can help to better understand the activity and degradation of MXenes, in order to guide their synthesis for superior functional properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19822v1-abstract-full').style.display = 'none'; document.getElementById('2305.19822v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.01351">arXiv:2305.01351</a> <span> [<a href="https://arxiv.org/pdf/2305.01351">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> The Premartensite and Martensite in Fe50Rh50 System </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Adabifiroozjaei%2C+E">Esmaeil Adabifiroozjaei</a>, <a href="/search/cond-mat?searchtype=author&query=Maccari%2C+F">Fernando Maccari</a>, <a href="/search/cond-mat?searchtype=author&query=Schaefer%2C+L">Lukas Schaefer</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+T">Tianshu Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Recalde-Benitez%2C+O">Oscar Recalde-Benitez</a>, <a href="/search/cond-mat?searchtype=author&query=Chirkova%2C+A">Alisa Chirkova</a>, <a href="/search/cond-mat?searchtype=author&query=Shayanfar%2C+N">Navid Shayanfar</a>, <a href="/search/cond-mat?searchtype=author&query=Dirba%2C+I">Imants Dirba</a>, <a href="/search/cond-mat?searchtype=author&query=Kani%2C+N+A">Nagaarjhuna A Kani</a>, <a href="/search/cond-mat?searchtype=author&query=Shuleshova%2C+O">Olga Shuleshova</a>, <a href="/search/cond-mat?searchtype=author&query=Winkler%2C+R">Robert Winkler</a>, <a href="/search/cond-mat?searchtype=author&query=Zintler%2C+A">Alexander Zintler</a>, <a href="/search/cond-mat?searchtype=author&query=Rao%2C+Z">Ziyuan Rao</a>, <a href="/search/cond-mat?searchtype=author&query=Pfeuffer%2C+L">Lukas Pfeuffer</a>, <a href="/search/cond-mat?searchtype=author&query=Kovacs%2C+A">Andras Kovacs</a>, <a href="/search/cond-mat?searchtype=author&query=Dunin-Borkowski%2C+R+E">Rafal E Dunin-Borkowski</a>, <a href="/search/cond-mat?searchtype=author&query=Farle%2C+M">Michael Farle</a>, <a href="/search/cond-mat?searchtype=author&query=Skokov%2C+K">Konstantin Skokov</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Gruner%2C+M">Markus Gruner</a>, <a href="/search/cond-mat?searchtype=author&query=Gutfleisch%2C+O">Oliver Gutfleisch</a>, <a href="/search/cond-mat?searchtype=author&query=Molina-Luna%2C+L">Leopoldo Molina-Luna</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.01351v2-abstract-short" style="display: inline;"> Metallic/intermetalic materials with BCC structures hold an intrinsic instability due to phonon softening along [110] dirrection, causing BCC to lower-symmetry phases transformation when the BCC structures are thermally or mechanically stressed. Fe50Rh50 binary system is one of the exceptional BCC structures (ordered-B2) that has not been yet showing such transformation upon application of thermal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.01351v2-abstract-full').style.display = 'inline'; document.getElementById('2305.01351v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.01351v2-abstract-full" style="display: none;"> Metallic/intermetalic materials with BCC structures hold an intrinsic instability due to phonon softening along [110] dirrection, causing BCC to lower-symmetry phases transformation when the BCC structures are thermally or mechanically stressed. Fe50Rh50 binary system is one of the exceptional BCC structures (ordered-B2) that has not been yet showing such transformation upon application of thermal stress, although mechanical deformation results in B2 to disordered FCC (gamma) and L10 phases transformation. Here, a comprehensive transmission electron microscopy (TEM) study is conducted on thermally-stressed samples of Fe50Rh50 aged at water and liquid nitrogen from 1150 degree C and 1250 degree C. The results show that, samples quenched from 1150 degree C into water and liquid nitrogen show presence of 1/4{110} and 1/2{110} satellite reflections, the latter of which is expected from phonon dispersion curves obtained by density functional theory calculation. Therefore, it is believed that Fe50Rh50 maintains the B2 structure that is in premartensite state. Once Fe50Rh50 is quenched from 1250 degree C into liquid nitrogen, formation of two short-range ordered tetragonal phases with various c/a ratios (~1.15 and 1.4) is observed in line with phases formed from mechanically deformed (30%) sample. According to our observations, an accurate atomistic shear model ({110}<1-10>) is presented that describes the martensitic transformation of B2 to these tetragonal phases. These findings offer implications useful for understanding of magnetic and physical characteristics of metallic/intermetallic materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.01351v2-abstract-full').style.display = 'none'; document.getElementById('2305.01351v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.14958">arXiv:2304.14958</a> <span> [<a href="https://arxiv.org/pdf/2304.14958">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Towards engineering the perfect defect in high-performing permanent magnets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Giron%2C+S">S. Giron</a>, <a href="/search/cond-mat?searchtype=author&query=Polin%2C+N">N. Polin</a>, <a href="/search/cond-mat?searchtype=author&query=Adabifiroozjaei%2C+E">E. Adabifiroozjaei</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+Y">Y. Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Kov%C3%A1cs%2C+A">A. Kov谩cs</a>, <a href="/search/cond-mat?searchtype=author&query=Almeida%2C+T+P">T. P. Almeida</a>, <a href="/search/cond-mat?searchtype=author&query=Ohmer%2C+D">D. Ohmer</a>, <a href="/search/cond-mat?searchtype=author&query=%C3%9Cst%C3%BCner%2C+K">K. 脺st眉ner</a>, <a href="/search/cond-mat?searchtype=author&query=Saxena%2C+A">A. Saxena</a>, <a href="/search/cond-mat?searchtype=author&query=Katter%2C+M">M. Katter</a>, <a href="/search/cond-mat?searchtype=author&query=Radulov%2C+I+A">I. A. Radulov</a>, <a href="/search/cond-mat?searchtype=author&query=Freysoldt%2C+C">C. Freysoldt</a>, <a href="/search/cond-mat?searchtype=author&query=Dunin-Borkowski%2C+R+E">R. E. Dunin-Borkowski</a>, <a href="/search/cond-mat?searchtype=author&query=Farle%2C+M">M. Farle</a>, <a href="/search/cond-mat?searchtype=author&query=Durst%2C+K">K. Durst</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">H. Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Alff%2C+L">L. Alff</a>, <a href="/search/cond-mat?searchtype=author&query=Ollefs%2C+K">K. Ollefs</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+B+-">B. -X. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Gutfleisch%2C+O">O. Gutfleisch</a>, <a href="/search/cond-mat?searchtype=author&query=Molina-Luna%2C+L">L. Molina-Luna</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">B. Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Skokov%2C+K+P">K. P. Skokov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.14958v2-abstract-short" style="display: inline;"> Permanent magnets draw their properties from a complex interplay, across multiple length scales, of the composition and distribution of their constituting phases, that act as building blocks, each with their associated intrinsic properties. Gaining a fundamental understanding of these interactions is hence key to decipher the origins of their magnetic performance and facilitate the engineering of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.14958v2-abstract-full').style.display = 'inline'; document.getElementById('2304.14958v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.14958v2-abstract-full" style="display: none;"> Permanent magnets draw their properties from a complex interplay, across multiple length scales, of the composition and distribution of their constituting phases, that act as building blocks, each with their associated intrinsic properties. Gaining a fundamental understanding of these interactions is hence key to decipher the origins of their magnetic performance and facilitate the engineering of better-performing magnets, through unlocking the design of the "perfect defects" for ultimate pinning of magnetic domains. Here, we deployed advanced multiscale microscopy and microanalysis on a bulk Sm2(CoFeCuZr)17 pinning-type high-performance magnet with outstanding thermal and chemical stability. Making use of regions with different chemical compositions, we showcase how both a change in the composition and distribution of copper, along with the atomic arrangements enforce the pinning of magnetic domains, as imaged by nanoscale magnetic induction mapping. Micromagnetic simulations bridge the scales to provide an understanding of how these peculiarities of micro- and nanostructure change the hard magnetic behaviour of Sm2(CoFeCuZr)17 magnets. Unveiling the origins of the reduced coercivity allows us to propose an atomic-scale defect and chemistry manipulation strategy to define ways toward future hard magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.14958v2-abstract-full').style.display = 'none'; document.getElementById('2304.14958v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.08761">arXiv:2304.08761</a> <span> [<a href="https://arxiv.org/pdf/2304.08761">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/micmic/ozad086">10.1093/micmic/ozad086 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A machine learning framework for quantifying chemical segregation and microstructural features in atom probe tomography data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Saxena%2C+A">Alaukik Saxena</a>, <a href="/search/cond-mat?searchtype=author&query=Polin%2C+N">Nikita Polin</a>, <a href="/search/cond-mat?searchtype=author&query=Kusampudi%2C+N">Navyanth Kusampudi</a>, <a href="/search/cond-mat?searchtype=author&query=Katnagallu%2C+S">Shyam Katnagallu</a>, <a href="/search/cond-mat?searchtype=author&query=Molina-Luna%2C+L">Leopoldo Molina-Luna</a>, <a href="/search/cond-mat?searchtype=author&query=Gutfleisch%2C+O">Oliver Gutfleisch</a>, <a href="/search/cond-mat?searchtype=author&query=Berkels%2C+B">Benjamin Berkels</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+J">J枚rg Neugebauer</a>, <a href="/search/cond-mat?searchtype=author&query=Freysoldt%2C+C">Christoph Freysoldt</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2304.08761v1-abstract-short" style="display: inline;"> Atom probe tomography (APT) is ideally suited to characterize and understand the interplay of chemical segregation and microstructure in modern multicomponent materials. Yet, the quantitative analysis typically relies on human expertise to define regions of interest. We introduce a computationally efficient, multistage machine learning strategy to identify chemically distinct domains in a semi aut… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08761v1-abstract-full').style.display = 'inline'; document.getElementById('2304.08761v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.08761v1-abstract-full" style="display: none;"> Atom probe tomography (APT) is ideally suited to characterize and understand the interplay of chemical segregation and microstructure in modern multicomponent materials. Yet, the quantitative analysis typically relies on human expertise to define regions of interest. We introduce a computationally efficient, multistage machine learning strategy to identify chemically distinct domains in a semi automated way, and subsequently quantify their geometric and compositional characteristics. In our algorithmic pipeline, we first coarse grain the APT data into voxels, collect the composition statistics, and decompose it via clustering in composition space. The composition classification then enables the real space segmentation via a density based clustering algorithm, thus revealing the microstructure at voxel resolution. Our approach is demonstrated for a Sm(Co,Fe)ZrCu alloy. The alloy exhibits two precipitate phases with a plate-like, but intertwined morphology. The primary segmentation is further refined to disentangle these geometrically complex precipitates into individual plate like parts by an unsupervised approach based on principle component analysis, or a U-Net based semantic segmentation trained on the former. Following the chemical and geometric analysis, detailed chemical distribution and segregation effects relative to the predominant plate-like geometry can be readily mapped without resorting to the initial voxelization. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.08761v1-abstract-full').style.display = 'none'; document.getElementById('2304.08761v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.18048">arXiv:2303.18048</a> <span> [<a href="https://arxiv.org/pdf/2303.18048">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> A versatile and reproducible cryo-sample preparation methodology for atom probe studies </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Woods%2C+E+V">Eric V. Woods</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+M+P">Mahander P. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Schwarz%2C+T+M">Tim M. Schwarz</a>, <a href="/search/cond-mat?searchtype=author&query=Douglas%2C+J+O">James O. Douglas</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A">Ayman El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Giulani%2C+F">Finn Giulani</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.18048v1-abstract-short" style="display: inline;"> Repeatable and reliable site-specific preparation of specimens for atom probe tomography (APT) at cryogenic temperatures has proven challenging. A generalized workflow is required for cryogenic-specimen preparation including lift-out via focused-ion beam and in-situ deposition of capping layers, to strengthen specimens that will be exposed to high electric field and stresses during field evaporati… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.18048v1-abstract-full').style.display = 'inline'; document.getElementById('2303.18048v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.18048v1-abstract-full" style="display: none;"> Repeatable and reliable site-specific preparation of specimens for atom probe tomography (APT) at cryogenic temperatures has proven challenging. A generalized workflow is required for cryogenic-specimen preparation including lift-out via focused-ion beam and in-situ deposition of capping layers, to strengthen specimens that will be exposed to high electric field and stresses during field evaporation in APT, and protect them from environment during transfer into the atom probe. Here, we build on existing protocols, and showcase preparation and analysis of a variety of metals, oxides and supported frozen liquids and battery materials. We demonstrate reliable in-situ deposition of a metallic capping layer that significantly improve the atom probe data quality for challenging material systems, particularly battery cathode materials which are subjected to delithiation during the atom probe analysis itself. Our workflow designed is versatile and transferable widely to other instruments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.18048v1-abstract-full').style.display = 'none'; document.getElementById('2303.18048v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.13433">arXiv:2303.13433</a> <span> [<a href="https://arxiv.org/pdf/2303.13433">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Machine learning-enabled tomographic imaging of chemical short-range atomic ordering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yue Li</a>, <a href="/search/cond-mat?searchtype=author&query=Colnaghi%2C+T">Timoteo Colnaghi</a>, <a href="/search/cond-mat?searchtype=author&query=Gong%2C+Y">Yilun Gong</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+H">Huaide Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+Y">Yuan Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Wei%2C+Y">Ye Wei</a>, <a href="/search/cond-mat?searchtype=author&query=Gan%2C+B">Bin Gan</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+M">Min Song</a>, <a href="/search/cond-mat?searchtype=author&query=Marek%2C+A">Andreas Marek</a>, <a href="/search/cond-mat?searchtype=author&query=Rampp%2C+M">Markus Rampp</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Siyuan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Pei%2C+Z">Zongrui Pei</a>, <a href="/search/cond-mat?searchtype=author&query=Wuttig%2C+M">Matthias Wuttig</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+J">J枚rg Neugebauer</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Zhangwei Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.13433v1-abstract-short" style="display: inline;"> In solids, chemical short-range order (CSRO) refers to the self-organisation of atoms of certain species occupying specific crystal sites. CSRO is increasingly being envisaged as a lever to tailor the mechanical and functional properties of materials. Yet quantitative relationships between properties and the morphology, number density, and atomic configurations of CSRO domains remain elusive. Here… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.13433v1-abstract-full').style.display = 'inline'; document.getElementById('2303.13433v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.13433v1-abstract-full" style="display: none;"> In solids, chemical short-range order (CSRO) refers to the self-organisation of atoms of certain species occupying specific crystal sites. CSRO is increasingly being envisaged as a lever to tailor the mechanical and functional properties of materials. Yet quantitative relationships between properties and the morphology, number density, and atomic configurations of CSRO domains remain elusive. Herein, we showcase how machine learning-enhanced atom probe tomography (APT) can mine the near-atomically resolved APT data and jointly exploit the technique's high elemental sensitivity to provide a 3D quantitative analysis of CSRO in a CoCrNi medium-entropy alloy. We reveal multiple CSRO configurations, with their formation supported by state-of-the-art Monte-Carlo simulations. Quantitative analysis of these CSROs allows us to establish relationships between processing parameters and physical properties. The unambiguous characterization of CSRO will help refine strategies for designing advanced materials by manipulating atomic-scale architectures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.13433v1-abstract-full').style.display = 'none'; document.getElementById('2303.13433v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.10548">arXiv:2303.10548</a> <span> [<a href="https://arxiv.org/pdf/2303.10548">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Exploring the Surface Segregation of Rh Dopant in PtNi Nanoparticles through Atom Probe Tomography Analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Jun%2C+H">Hosun Jun</a>, <a href="/search/cond-mat?searchtype=author&query=Jang%2C+K">Kyuseon Jang</a>, <a href="/search/cond-mat?searchtype=author&query=Choi%2C+P">Pyuck-Pa Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Jung%2C+C">Chanwon Jung</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.10548v1-abstract-short" style="display: inline;"> Proton exchange membrane fuel cells hold promise as energy conversion devices for hydrogen-based power generation and storage. However, the slow kinetics of the oxygen reduction at the cathode imposes the need for highly active catalysts, typically Pt or Pt-based, with a large available area. The scarcity of Pt increases deployment and operational cost, driving the development of novel highly-acti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.10548v1-abstract-full').style.display = 'inline'; document.getElementById('2303.10548v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.10548v1-abstract-full" style="display: none;"> Proton exchange membrane fuel cells hold promise as energy conversion devices for hydrogen-based power generation and storage. However, the slow kinetics of the oxygen reduction at the cathode imposes the need for highly active catalysts, typically Pt or Pt-based, with a large available area. The scarcity of Pt increases deployment and operational cost, driving the development of novel highly-active material systems. As an alternative, Rh-doped PtNi nanoparticle has been suggested as promising oxygen reduction catalyst, but the 3D distributions of constituent elements in the nanoparticles have remained unclear, making it difficult to guide property optimization. Here, a combination of advanced microscopy and microanalysis techniques is used to study the Rh distribution in the PtNi nanoparticles, and Rh surface segregation is revealed, even with an overall Rh content below 2 at. %. Our findings suggest that doping and surface chemistry must be carefully investigated to establish a clear link with catalytic activity can truly be established. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.10548v1-abstract-full').style.display = 'none'; document.getElementById('2303.10548v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.04625">arXiv:2303.04625</a> <span> [<a href="https://arxiv.org/pdf/2303.04625">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Nanoscale perspective on the stress-corrosion cracking behavior of a peak-aged 7XXX-Al alloy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Freixes%2C+M+L">Mart铆 L贸pez Freixes</a>, <a href="/search/cond-mat?searchtype=author&query=Peguet%2C+L">Lionel Peguet</a>, <a href="/search/cond-mat?searchtype=author&query=Warner%2C+T">Timothy Warner</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.04625v1-abstract-short" style="display: inline;"> High strength 7xxx Al-alloys are currently commonly used in aerospace and are expected to be increasingly employed in the automotive sector for weight reduction purposes. These alloys can however be sensitive to stress-corrosion cracking (SCC) depending on temper and loading conditions. Both the alloy's grain structure and composition are believed to play a key role in determining sensitivity to S… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04625v1-abstract-full').style.display = 'inline'; document.getElementById('2303.04625v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.04625v1-abstract-full" style="display: none;"> High strength 7xxx Al-alloys are currently commonly used in aerospace and are expected to be increasingly employed in the automotive sector for weight reduction purposes. These alloys can however be sensitive to stress-corrosion cracking (SCC) depending on temper and loading conditions. Both the alloy's grain structure and composition are believed to play a key role in determining sensitivity to SCC. Here, we study at the nanometer scale the evolution of the microstructure near stress corrosion cracks on two different model variants of the 7140 aluminum alloy. We performed double cantilever beam (DCB) crack growth tests in hot (70掳C) humid air, on samples extracted at quarter-thickness (T/4) and mid-thickness (T/2) and heat treated to a non-industrial, SCC sensitive T6 condition. The sample at T/4 shows a lower KISCC along with flatter grains and a higher solute content, whereas both samples exhibit similar crack growth rates at higher stress intensities. We report on precipitate dissolution and matrix solute enrichment near the crack tips, with the T/4 position presenting the higher increase in solute levels. The near grain boundary microstructure ahead of the crack is modified, with evidence of precipitate dissolution and transport of solutes towards the stress-corrosion crack tip. These results agree with a recent report on another 7xxx Al-alloy after SCC in Cl-solution, supporting the possibility that these mechanisms are generally occurring. We relate our findings with the measured SCC behavior and provide an array of possible mechanisms that could be widely applicable in SCC of high strength Al-alloys. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.04625v1-abstract-full').style.display = 'none'; document.getElementById('2303.04625v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.06317">arXiv:2302.06317</a> <span> [<a href="https://arxiv.org/pdf/2302.06317">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Atomic scale understanding of the role of hydrogen and oxygen segregation in the embrittlement of grain boundaries in a twinning induced plasticity steel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Khanchandani%2C+H">Heena Khanchandani</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.06317v2-abstract-short" style="display: inline;"> Twinning induced plasticity (TWIP) steels are high strength metallic materials with potential for structural components in e.g. automotive applications. However, they are prone to hydrogen embrittlement (HE) and galvanic corrosion. We investigated the susceptibility of a model Fe 27Mn 0.3C (wt%) TWIP steel towards HE and oxidation at the sub-nanometer scale by atom probe tomography. We measured se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.06317v2-abstract-full').style.display = 'inline'; document.getElementById('2302.06317v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.06317v2-abstract-full" style="display: none;"> Twinning induced plasticity (TWIP) steels are high strength metallic materials with potential for structural components in e.g. automotive applications. However, they are prone to hydrogen embrittlement (HE) and galvanic corrosion. We investigated the susceptibility of a model Fe 27Mn 0.3C (wt%) TWIP steel towards HE and oxidation at the sub-nanometer scale by atom probe tomography. We measured segregation of hydrogen and oxygen at grain boundaries, which appears to be associated to a strong manganese depletion. Our study suggests a correlation between HE and oxidation mechanisms in TWIP steels, which we argue can combine to favor the previously reported hydrogen enhanced decohesion (HEDE) of grain boundaries. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.06317v2-abstract-full').style.display = 'none'; document.getElementById('2302.06317v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.02588">arXiv:2302.02588</a> <span> [<a href="https://arxiv.org/pdf/2302.02588">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> B dopant evolution in Pd catalysts after H evolution/oxidation reaction in alkaline environment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Yoo%2C+S">Su-Hyun Yoo</a>, <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo Shoji Aota</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A">Ayman El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Kang%2C+P">Philwoong Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+Y">Yonghyuk Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.02588v1-abstract-short" style="display: inline;"> Introduction of interstitial dopants has opened a new pathway to optimize nanoparticle catalytic activity for, e.g., hydrogen evolution/oxidation and other reactions. Here, we discuss the stability of a property-enhancing dopant, B, introduced through controlled synthesis of an electrocatalyst Pd aerogel. We observe significant removal of B after the hydrogen evolution/oxidation reaction. Ab-initi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02588v1-abstract-full').style.display = 'inline'; document.getElementById('2302.02588v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.02588v1-abstract-full" style="display: none;"> Introduction of interstitial dopants has opened a new pathway to optimize nanoparticle catalytic activity for, e.g., hydrogen evolution/oxidation and other reactions. Here, we discuss the stability of a property-enhancing dopant, B, introduced through controlled synthesis of an electrocatalyst Pd aerogel. We observe significant removal of B after the hydrogen evolution/oxidation reaction. Ab-initio calculations show that the high stability of sub-surface B in Pd is substantially reduced when H is ad/absorbed on the surface, favoring its departure from the host nanostructure. The destabilization of sub-surface B is more pronounced as more H occupies surface sites and empty interstitial sites. We hence demonstrate that the H2 fuel/product itself favors the microstructural degradation of the electrocatalyst and an associated drop in activity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02588v1-abstract-full').style.display = 'none'; document.getElementById('2302.02588v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.02578">arXiv:2302.02578</a> <span> [<a href="https://arxiv.org/pdf/2302.02578">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Revealing compositional evolution of PdAu electrocatalyst by atom probe tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Aota%2C+L+S">Leonardo Shoji Aota</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Jung%2C+C">Chanwon Jung</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Siyuan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.02578v2-abstract-short" style="display: inline;"> Pd-based electro-catalysts are a key component to improve the methanol oxidation reaction (MOR) kinetics from alcohol fuel cells. However, the performance of such catalysts is degraded over time. To understand the microstructural/atomic scale chemical changes responsible for such effect, scanning (transmission) electron microscopies and atom probe tomography (APT) were performed after accelerated… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02578v2-abstract-full').style.display = 'inline'; document.getElementById('2302.02578v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.02578v2-abstract-full" style="display: none;"> Pd-based electro-catalysts are a key component to improve the methanol oxidation reaction (MOR) kinetics from alcohol fuel cells. However, the performance of such catalysts is degraded over time. To understand the microstructural/atomic scale chemical changes responsible for such effect, scanning (transmission) electron microscopies and atom probe tomography (APT) were performed after accelerated degradation tests (ADT). No morphological changes are observed after 1000 MOR cycles. Contrastingly, (1) Pd and B are leached from PdAu nanoparticles and (2) Au-rich regions are formed at the surface of the catalyst. These insights highlight the importance of understanding the chemical modification undergoing upon MOR to design superior catalysts. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02578v2-abstract-full').style.display = 'none'; document.getElementById('2302.02578v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.02577">arXiv:2302.02577</a> <span> [<a href="https://arxiv.org/pdf/2302.02577">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Atom probe analysis of BaTiO3 enabled by metallic shielding </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Shin%2C+K">Kihyun Shin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Jung%2C+C">Chanwon Jung</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+H+Y">Hyun You Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Pedrazzini%2C+S">Stella Pedrazzini</a>, <a href="/search/cond-mat?searchtype=author&query=Conroy%2C+M">Michele Conroy</a>, <a href="/search/cond-mat?searchtype=author&query=Henkelman%2C+G">Graeme Henkelman</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.02577v1-abstract-short" style="display: inline;"> Atom probe tomography has been raising in prominence as a microscopy and microanalysis technique to gain sub-nanoscale information from technologically-relevant materials. However, the analysis of some functional ceramics, particularly perovskites, has remained challenging with extremely low yield and success rate. This seems particularly problematic for materials with high piezoelectric activity,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02577v1-abstract-full').style.display = 'inline'; document.getElementById('2302.02577v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.02577v1-abstract-full" style="display: none;"> Atom probe tomography has been raising in prominence as a microscopy and microanalysis technique to gain sub-nanoscale information from technologically-relevant materials. However, the analysis of some functional ceramics, particularly perovskites, has remained challenging with extremely low yield and success rate. This seems particularly problematic for materials with high piezoelectric activity, which may be difficult to express at the low temperatures necessary for satisfactory atom probe analysis. Here, we demonstrate the analysis of commercial BaTiO3 particles embedded in a metallic matrix. Density-functional theory shows that a metallic coating prevents charge penetration of the electrostatic field, and thereby suppresses the associated volume associated change linked to the piezoelectric effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.02577v1-abstract-full').style.display = 'none'; document.getElementById('2302.02577v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.06391">arXiv:2301.06391</a> <span> [<a href="https://arxiv.org/pdf/2301.06391">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> The fate of water in hydrogen-based iron oxide reduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A+A">Ayman A. El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Stephenson%2C+L+T">Leigh T. Stephenson</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.06391v1-abstract-short" style="display: inline;"> Gas-solid reactions are cornerstones of many catalytic and redox processes that will underpin the energy and sustainability transition. The specific case of hydrogen-based iron oxide reduction is the foundation to render the global steel industry fossil-free, an essential target as iron production is the largest single industrial emitter of carbon dioxide. Our perception of gas-solid reactions has… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.06391v1-abstract-full').style.display = 'inline'; document.getElementById('2301.06391v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.06391v1-abstract-full" style="display: none;"> Gas-solid reactions are cornerstones of many catalytic and redox processes that will underpin the energy and sustainability transition. The specific case of hydrogen-based iron oxide reduction is the foundation to render the global steel industry fossil-free, an essential target as iron production is the largest single industrial emitter of carbon dioxide. Our perception of gas-solid reactions has not only been limited by the availability of state-of-the-art techniques which can delve into the reacted solids in great structural and chemical detail, but we continue to miss an important reaction partner that defines the thermodynamics and kinetics of gas phase reactions: the gas molecules. In this investigation, we use the latest development in cryogenic atom probe tomography to study the quasi in-situ evolution of gas phase heavy water at iron-iron oxide interfaces resulting from the direct reduction of iron oxide by deuterium gas at 700掳C. The findings provide new insights into the formation kinetics and location of water formed during hydrogen-based reduction of FeO, an its interaction with the ongoing redox reaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.06391v1-abstract-full').style.display = 'none'; document.getElementById('2301.06391v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.06362">arXiv:2212.06362</a> <span> [<a href="https://arxiv.org/pdf/2212.06362">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/micmic/ozad029">10.1093/micmic/ozad029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transmission Kikuchi diffraction mapping induces structural damage in atom probe specimens </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Khanchandani%2C+H">Heena Khanchandani</a>, <a href="/search/cond-mat?searchtype=author&query=Prithiv%2C+T+S">T. S. Prithiv</a>, <a href="/search/cond-mat?searchtype=author&query=Antonov%2C+S">Stoichko Antonov</a>, <a href="/search/cond-mat?searchtype=author&query=Britton%2C+T+B">T. Ben Britton</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.06362v2-abstract-short" style="display: inline;"> Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is facilitated by using transmission Kikuchi diffraction (TKD) to help position them sufficiently close to the apex of the needle-shaped specimen. However, possible structural damage associated to the energetic electrons used to perform TKD is rarely considered and is hence not well-understood. Here, in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.06362v2-abstract-full').style.display = 'inline'; document.getElementById('2212.06362v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.06362v2-abstract-full" style="display: none;"> Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is facilitated by using transmission Kikuchi diffraction (TKD) to help position them sufficiently close to the apex of the needle-shaped specimen. However, possible structural damage associated to the energetic electrons used to perform TKD is rarely considered and is hence not well-understood. Here, in two case studies, we evidence damage in APT specimens from TKD mapping. First, we analyze a solid solution, metastable \b{eta}-Ti-12Mo alloy, in which the Mo is expected to be homogenously distributed. Following TKD, APT reveals a planar segregation of Mo amongst other elements. Second, specimens were prepared near 危3 twin boundaries in a high manganese twinning-induced plasticity steel, and subsequently charged with deuterium gas. Beyond a similar planar segregation, voids containing a high concentration of deuterium, i.e. bubbles, are detected in the specimen on which TKD was performed. Both examples showcase damage from TKD mapping leading to artefacts in the compositional distribution of solutes. We propose that the structural damage is created by surface species, including H and C, subjected to recoil from incoming energetic electrons during mapping, thereby getting implanted and causing cascades of structural damage in the sample. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.06362v2-abstract-full').style.display = 'none'; document.getElementById('2212.06362v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.15216">arXiv:2211.15216</a> <span> [<a href="https://arxiv.org/pdf/2211.15216">pdf</a>, <a href="https://arxiv.org/format/2211.15216">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Interstitial segregation has the potential to mitigate liquid metal embrittlement in iron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ahmadian%2C+A">Ali Ahmadian</a>, <a href="/search/cond-mat?searchtype=author&query=Scheiber%2C+D">Daniel Scheiber</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Kamachali%2C+R+D">Reza Darvishi Kamachali</a>, <a href="/search/cond-mat?searchtype=author&query=Ecker%2C+W">Werner Ecker</a>, <a href="/search/cond-mat?searchtype=author&query=Romaner%2C+L">Lorenz Romaner</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Liebscher%2C+C+H">Christian H. Liebscher</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.15216v1-abstract-short" style="display: inline;"> The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. The weakening of grain boundaries by the ingress of liquid metal and preceding segregation in the solid are thought to promote early fracture. However, the potential of balancing between the segregation of cohesion-enhancing interstitial solutes and embrittl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.15216v1-abstract-full').style.display = 'inline'; document.getElementById('2211.15216v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.15216v1-abstract-full" style="display: none;"> The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. The weakening of grain boundaries by the ingress of liquid metal and preceding segregation in the solid are thought to promote early fracture. However, the potential of balancing between the segregation of cohesion-enhancing interstitial solutes and embrittling elements inducing grain boundary decohesion is not understood. Here, we unveil the mechanisms of how boron segregation mitigates the detrimental effects of the prime embrittler, zinc, in a $危5\,[0\,0\,1]$ tilt grain boundary in $伪-$Fe ($4~at.\%$ Al). Zinc forms nanoscale segregation patterns inducing structurally and compositionally complex grain boundary states. Ab-initio simulations reveal that boron hinders zinc segregation and compensates for the zinc induced loss in grain boundary cohesion. Our work sheds new light on how interstitial solutes intimately modify grain boundaries, thereby opening pathways to use them as dopants for preventing disastrous material failure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.15216v1-abstract-full').style.display = 'none'; document.getElementById('2211.15216v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages, 6 figures in the main text and 10 figures in the supplementary</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.09347">arXiv:2211.09347</a> <span> [<a href="https://arxiv.org/pdf/2211.09347">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.scriptamat.2022.115187">10.1016/j.scriptamat.2022.115187 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hydrogen embrittlement of twinning-induced plasticity steels: contribution of segregation to twin boundaries </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Khanchandani%2C+H">Heena Khanchandani</a>, <a href="/search/cond-mat?searchtype=author&query=Rolli%2C+R">Rolf Rolli</a>, <a href="/search/cond-mat?searchtype=author&query=Schneider%2C+H">Hans-Christian Schneider</a>, <a href="/search/cond-mat?searchtype=author&query=Kirchlechner%2C+C">Christoph Kirchlechner</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.09347v2-abstract-short" style="display: inline;"> Metallic materials, especially steel, underpin transportation technologies. High-manganese twinning induced plasticity (TWIP) austenitic steels exhibit exceptional strength and ductility from twins, low-energy microstructural defects that form during plastic loading. Their high-strength could help light-weighting vehicles, and hence cut carbon emissions. TWIP steels are however very sensitive to h… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09347v2-abstract-full').style.display = 'inline'; document.getElementById('2211.09347v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09347v2-abstract-full" style="display: none;"> Metallic materials, especially steel, underpin transportation technologies. High-manganese twinning induced plasticity (TWIP) austenitic steels exhibit exceptional strength and ductility from twins, low-energy microstructural defects that form during plastic loading. Their high-strength could help light-weighting vehicles, and hence cut carbon emissions. TWIP steels are however very sensitive to hydrogen embrittlement that causes dramatic losses of ductility and toughness leading to catastrophic failure of engineering parts. Here, we examine the atomic-scale chemistry and interaction of hydrogen with twin boundaries in a model TWIP steel by using isotope-labelled atom probe tomography, using tritium to avoid overlap with residual hydrogen. We reveal co-segregation of tritium and, unexpectedly, oxygen to coherent twin boundaries, and discuss their combined role in the embrittlement of these promising steels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09347v2-abstract-full').style.display = 'none'; document.getElementById('2211.09347v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.08261">arXiv:2211.08261</a> <span> [<a href="https://arxiv.org/pdf/2211.08261">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-023-39302-x">10.1038/s41467-023-39302-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Atomic motifs govern the decoration of grain boundaries by interstitial solutes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Ahmadian%2C+A">Ali Ahmadian</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Ophus%2C+C">Colin Ophus</a>, <a href="/search/cond-mat?searchtype=author&query=Liebscher%2C+C+H">Christian H. Liebscher</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.08261v2-abstract-short" style="display: inline;"> Grain boundaries, the two-dimensional (2D) defects between differently oriented crystals, control mechanical and transport properties of materials. Our fundamental understanding of grain boundaries is still incomplete even after nearly a century and a half of research since Sorby first imaged grains. Here, we present a systematic study, over 9 orders of magnitude of size scales, in which we analyz… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.08261v2-abstract-full').style.display = 'inline'; document.getElementById('2211.08261v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.08261v2-abstract-full" style="display: none;"> Grain boundaries, the two-dimensional (2D) defects between differently oriented crystals, control mechanical and transport properties of materials. Our fundamental understanding of grain boundaries is still incomplete even after nearly a century and a half of research since Sorby first imaged grains. Here, we present a systematic study, over 9 orders of magnitude of size scales, in which we analyze 2D defects between two neighboring crystals across five hierarchy levels and investigate their crystallographic, compositional, and electronic features. The levels are (a) the macroscale interface alignment and grain misorientation (held constant here); (b) the systematic mesoscopic change in the inclination of the grain boundary plane for the same orientation difference; (c) the facets, atomic motifs (structural units), and internal nanoscopic defects within the boundary plane; (d) the grain boundary chemistry; and (e) the electronic structure of the atomic motifs. As a model material, we use Fe alloyed with B and C, exploiting the strong interdependence of interface structure and chemistry in this system. This model system is the basis of the 1.9 billion tons of steel produced annually and has an eminent role as a catalyst. Surprisingly, we find that even a change in the inclination of the GB plane with identical misorientation impacts GB composition and atomic arrangement. Thus, it is the smallest structural hierarchical level, the atomic motifs, which control the most important chemical properties of the grain boundaries. This finding not only closes a missing link between the structure and chemical composition of such defects but also enables the targeted design and passivation of the chemical state of grain boundaries to free them from their role as entry gates for corrosion, hydrogen embrittlement, or mechanical failure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.08261v2-abstract-full').style.display = 'none'; document.getElementById('2211.08261v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.06877">arXiv:2211.06877</a> <span> [<a href="https://arxiv.org/pdf/2211.06877">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/micmic/ozad020">10.1093/micmic/ozad020 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-situ sputtering from the micromanipulator to enable cryogenic preparation of specimens for atom probe tomography by focused-ion beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Douglas%2C+J+O">James O. Douglas</a>, <a href="/search/cond-mat?searchtype=author&query=Conroy%2C+M">Michele Conroy</a>, <a href="/search/cond-mat?searchtype=author&query=Giuliani%2C+F">Finn Giuliani</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.06877v1-abstract-short" style="display: inline;"> Workflows have been developed in the past decade to enable atom probe tomography analysis at cryogenic temperatures. The inability to control the local deposition of the metallic precursor from the gas-injection system (GIS) at cryogenic temperature makes the preparation of site-specific specimens by using lift-out extremely challenging in the focused-ion beam. Schreiber et al. exploited redeposit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.06877v1-abstract-full').style.display = 'inline'; document.getElementById('2211.06877v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.06877v1-abstract-full" style="display: none;"> Workflows have been developed in the past decade to enable atom probe tomography analysis at cryogenic temperatures. The inability to control the local deposition of the metallic precursor from the gas-injection system (GIS) at cryogenic temperature makes the preparation of site-specific specimens by using lift-out extremely challenging in the focused-ion beam. Schreiber et al. exploited redeposition to weld the lifted-out sample to a support. Here we build on their approach to attach the region-of-interest and additionally strengthen the interface with locally sputtered metal from the micromanipulator. Following standard focused-ion beam annular milling, we demonstrate atom probe analysis of Si in both laser pulsing and voltage mode, with comparable analytical performance as a pre-sharpened microtip coupon. Our welding approach is versatile, as various metals could be used for sputtering, and allows similar flexibility as the GIS in principle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.06877v1-abstract-full').style.display = 'none'; document.getElementById('2211.06877v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.13166">arXiv:2209.13166</a> <span> [<a href="https://arxiv.org/pdf/2209.13166">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Chemical Partitioning at Crystalline Defects in PtAu as a Pathway to Stabilize Electrocatalysts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Kasian%2C+O">Olga Kasian</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+T">Ting Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chenyu Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Siyuan Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S">Subin Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Thompson%2C+G+B">Gregory B. Thompson</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.13166v1-abstract-short" style="display: inline;"> Dissolution of electrocatalysts during long-term and dynamic operation is a challenging problem in energy conversion and storage devices such as fuel cells and electrolyzers. To develop stable electrocatalysts, we adopt the design concept of segregation engineering, which uses solute segregation prone to electrochemical dissolution at internal defects, i.e., grain boundaries and dislocations. We s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.13166v1-abstract-full').style.display = 'inline'; document.getElementById('2209.13166v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.13166v1-abstract-full" style="display: none;"> Dissolution of electrocatalysts during long-term and dynamic operation is a challenging problem in energy conversion and storage devices such as fuel cells and electrolyzers. To develop stable electrocatalysts, we adopt the design concept of segregation engineering, which uses solute segregation prone to electrochemical dissolution at internal defects, i.e., grain boundaries and dislocations. We showcase the feasibility of this approach by stabilizing a model Pt catalyst with an addition of more noble Au (approximately 5 atomic percent). We characterized the defects' nanoscale structure and chemistry, and monitored the electrochemical dissolution of Pt and PtAu alloys by online inductively coupled plasma mass spectrometry. Once segregated to defects, Au atoms can stabilize and hence passivate the most vulnerable sites against electrochemical dissolution and improve the stability and longevity of the Pt electrocatalysts by more than an order of magnitude. This opens pathways to use solute segregation to defects for the development of more stable nanoscale electrocatalysts, a concept applicable for a wide range of catalytic systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.13166v1-abstract-full').style.display = 'none'; document.getElementById('2209.13166v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.09789">arXiv:2209.09789</a> <span> [<a href="https://arxiv.org/pdf/2209.09789">pdf</a>, <a href="https://arxiv.org/format/2209.09789">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Tailoring negative pressure by crystal defects: Crack induced hydride formation in Al alloys </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tehranchi%2C+A">A. Tehranchi</a>, <a href="/search/cond-mat?searchtype=author&query=Chakraborty%2C+P">P. Chakraborty</a>, <a href="/search/cond-mat?searchtype=author&query=Freixes%2C+M+L">M. L. Freixes</a>, <a href="/search/cond-mat?searchtype=author&query=McEniry%2C+E">E. McEniry</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">B. Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Hickel%2C+T">T. Hickel</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+J">J. Neugebauer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.09789v1-abstract-short" style="display: inline;"> Climate change motivates the search for non-carbon-emitting energy generation and storage solutions. Metal hydrides show promising characteristics for this purpose. They can be further stabilized by tailoring the negative pressure of microstructural and structural defects. Using systematic ab initio and atomistic simulations, we demonstrate that an enhancement in the formation of hydrides at the n… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.09789v1-abstract-full').style.display = 'inline'; document.getElementById('2209.09789v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.09789v1-abstract-full" style="display: none;"> Climate change motivates the search for non-carbon-emitting energy generation and storage solutions. Metal hydrides show promising characteristics for this purpose. They can be further stabilized by tailoring the negative pressure of microstructural and structural defects. Using systematic ab initio and atomistic simulations, we demonstrate that an enhancement in the formation of hydrides at the negatively pressurized crack tip region is feasible by increasing the mechanical tensile load on the specimen. The theoretical predictions have been used to reassess and interpret atom probe tomography experiments for a high-strength 7XXX-aluminium alloy that show a substantial enhancement of hydrogen concentration at structural defects near a stress-corrosion crack tip. These results contain important implications for enhancing the capability of metals as H-storage materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.09789v1-abstract-full').style.display = 'none'; document.getElementById('2209.09789v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.09147">arXiv:2209.09147</a> <span> [<a href="https://arxiv.org/pdf/2209.09147">pdf</a>, <a href="https://arxiv.org/format/2209.09147">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Effect of Sn on generalized stacking fault energy surfaces in zirconium and its hydrides </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chakraborty%2C+P">P. Chakraborty</a>, <a href="/search/cond-mat?searchtype=author&query=Mouton%2C+I">I. Mouton</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">B. Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Tehranchi%2C+A">A. Tehranchi</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+J">J. Neugebauer</a>, <a href="/search/cond-mat?searchtype=author&query=Hickel%2C+T">T. Hickel</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.09147v1-abstract-short" style="display: inline;"> Hydrogen embrittlement in Zr alloy fuel cladding is a primary safety concern for water based nuclear reactors. Here we investigated the stabilisation of planar defects within the forming hydrides by Sn, the primary alloying element of Zircaloy-4 used in the cladding. In order to explain formation of hydrides and planar defects observed in our experiments, we performed atomic-scale ab initio calcul… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.09147v1-abstract-full').style.display = 'inline'; document.getElementById('2209.09147v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.09147v1-abstract-full" style="display: none;"> Hydrogen embrittlement in Zr alloy fuel cladding is a primary safety concern for water based nuclear reactors. Here we investigated the stabilisation of planar defects within the forming hydrides by Sn, the primary alloying element of Zircaloy-4 used in the cladding. In order to explain formation of hydrides and planar defects observed in our experiments, we performed atomic-scale ab initio calculations focusing on the solute interactions with generalized stacking faults in hcp $伪$-Zr and fcc zirconium hydrides. Our calculations showed that an increase in Sn concentration leads to a stabilisation of stacking faults in both $伪$-Zr and hydride phases. However, the solution enthalpy of Sn is lower in the $伪$-Zr as compared to the other hydride phases indicative of two competing processes of Sn depletion/enrichment at the Zr hydride/matrix interface. This is corroborated by experimental findings, where Sn is repelled by hydrides and is mostly found trapped at interfaces and planar defects indicative of stacking faults inside the hydride phases. Our systematic investigation enables us to understand the presence and distribution of solutes in the hydride phases, which provides a deeper insight into the microstructural evolution of such alloy's properties during its service lifetime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.09147v1-abstract-full').style.display = 'none'; document.getElementById('2209.09147v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.09069">arXiv:2209.09069</a> <span> [<a href="https://arxiv.org/pdf/2209.09069">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.168001">10.1103/PhysRevLett.130.168001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effect of Pore Formation on Redox-Driven Phase Transformation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xuyang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Bai%2C+Y">Yang Bai</a>, <a href="/search/cond-mat?searchtype=author&query=El-Zoka%2C+A+A">Ayman A. El-Zoka</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Se-Ho Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+Y">Yan Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Liebscher%2C+C+H">Christian H. Liebscher</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Mianroodi%2C+J+R">Jaber R. Mianroodi</a>, <a href="/search/cond-mat?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/cond-mat?searchtype=author&query=Raabe%2C+D">Dierk Raabe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.09069v2-abstract-short" style="display: inline;"> When solid-state redox-driven phase transformations are associated with mass loss, vacancies are produced that develop into pores. These pores can influence the kinetics of certain redox and phase transformation steps. We investigated the structural and chemical mechanisms in and at pores in a combined experimental-theoretical study, using the reduction of iron oxide by hydrogen as a model system.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.09069v2-abstract-full').style.display = 'inline'; document.getElementById('2209.09069v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.09069v2-abstract-full" style="display: none;"> When solid-state redox-driven phase transformations are associated with mass loss, vacancies are produced that develop into pores. These pores can influence the kinetics of certain redox and phase transformation steps. We investigated the structural and chemical mechanisms in and at pores in a combined experimental-theoretical study, using the reduction of iron oxide by hydrogen as a model system. The redox product (water) accumulates inside the pores and shifts the local equilibrium at the already reduced material back towards re-oxidation into cubic-Fe1-xO (where x refers to Fe deficiency, space group Fm3-m). This effect helps to understand the sluggish reduction of cubic-Fe1-xO by hydrogen, a key process for future sustainable steelmaking. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.09069v2-abstract-full').style.display = 'none'; document.getElementById('2209.09069v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.06533">arXiv:2209.06533</a> <span> [<a href="https://arxiv.org/pdf/2209.06533">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.107.L041406">10.1103/PhysRevB.107.L041406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ab initio vacancy formation energies and kinetics at metal surfaces under high electric field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Katnagallu%2C+S">Shyam Katnagallu</a>, <a href="/search/cond-mat?searchtype=author&query=Freysoldt%2C+C">Christoph Freysoldt</a>, <a href="/search/cond-mat?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/cond-mat?searchtype=author&query=Neugebauer%2C+J">J枚rg Neugebauer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.06533v1-abstract-short" style="display: inline;"> Recording field ion microscope images under field evaporating conditions and subsequently reconstructing the underlying atomic configuration, called three-dimensional field ion microscopy (3D-FIM) is one of the few techniques capable of resolving crystalline defects at an atomic scale. However, the quantification of the observed vacancies and their origins are still a matter of debate. It was sugg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.06533v1-abstract-full').style.display = 'inline'; document.getElementById('2209.06533v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.06533v1-abstract-full" style="display: none;"> Recording field ion microscope images under field evaporating conditions and subsequently reconstructing the underlying atomic configuration, called three-dimensional field ion microscopy (3D-FIM) is one of the few techniques capable of resolving crystalline defects at an atomic scale. However, the quantification of the observed vacancies and their origins are still a matter of debate. It was suggested that high electric fields (1-5 V/脜) used in 3D-FIM could introduce artefact vacancies. To investigate such effects, we used density functional theory (DFT) simulations. Stepped Ni and Pt surfaces with kinks were modelled in the repeated slab approach with a (971) surface orientation. An electrostatic field of up to 4 V/脜 was introduced on one side of the slab using the generalized dipole correction. Contrary to what was proposed, we show that the formation of vacancies on the electrified metal surface is more difficult compared to a field-free case. We also find that the electric field can introduce kinetic barriers to a potential vacancy-annihilation mechanism. We rationalize these findings by comparing to insights from field evaporation models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.06533v1-abstract-full').style.display = 'none'; document.getElementById('2209.06533v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Gault%2C+B&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Gault%2C+B&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> 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