Search results for: S. Nqayi

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Nqayi</title> <meta name="description" content="Search results for: S. Nqayi"> <meta name="keywords" content="S. Nqayi"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler ml-auto" type="button" data-toggle="collapse" data-target="#navbarMenu" aria-controls="navbarMenu" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="w-100"> <div class="d-none d-lg-flex flex-row-reverse"> <form method="get" action="https://waset.org/search" class="form-inline my-2 my-lg-0"> <input class="form-control mr-sm-2" type="search" placeholder="Search Conferences" value="S. 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Nqayi"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 3</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: S. Nqayi</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">3</span> Intermediate Valence Effect of Ce in Structural and Magnetic Properties of Ceramic Sm₂MnCeO₆+δ</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sibusiso%20Nqayi">Sibusiso Nqayi</a>, <a href="https://publications.waset.org/abstracts/search?q=Buyisiwe%20Sondezi"> Buyisiwe Sondezi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This investigation concentrates on the complex interrelations of intermediate valence states of cerium (Ce³⁺/Ce⁴⁺) and their respective contributions to distinctive magnetic phenomena, including antiferromagnetic (AFM) and ferromagnetic (FM) orderings, in addition to Griffith's phase. The Sm₂MnCeO₆+δ (SMCO) ceramic was prepared using the high-temperature solid-state method and crystallized in a cubic crystal structure with an Ia3d space group, possessing a uniform distribution of constituent elements. Magnetic susceptibility measurements reveal a Néel temperature (TN) of 13.8 K, indicating AFM behaviour, alongside evidence of Griffith's phase (GP) dynamics, 46.2 ≤T≤139.1 K. This phase follows a ferromagnetic (FM) ordering at Curie temperature (TC) of 43.7 K, which is an indication of the presence of short-range ordering of spins. The simultaneous presence of various oxidation states and their influence on both magnetic and structural characteristics positions SMCO as a versatile material proficient in functioning under elevated temperature conditions. This research paves the way for innovative applications of magnetic ceramics in the realms of catalysis, solid oxide fuel cells (SOFCs), and spintronics devices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sm%E2%82%82MnCeO%E2%82%86%2B%CE%B4" title="Sm₂MnCeO₆+δ">Sm₂MnCeO₆+δ</a>, <a href="https://publications.waset.org/abstracts/search?q=ceramics" title=" ceramics"> ceramics</a>, <a href="https://publications.waset.org/abstracts/search?q=Ne%CC%81el%20temperature" title=" Néel temperature"> Néel temperature</a>, <a href="https://publications.waset.org/abstracts/search?q=Curie%20temperature" title=" Curie temperature"> Curie temperature</a>, <a href="https://publications.waset.org/abstracts/search?q=Griffith%27s%20phase" title=" Griffith's phase"> Griffith's phase</a> </p> <a href="https://publications.waset.org/abstracts/197366/intermediate-valence-effect-of-ce-in-structural-and-magnetic-properties-of-ceramic-sm2mnceo6d" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/197366.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">11</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2</span> Structural, Magnetic, and Dielectric Studies of Tetragonally Ordered Sm₂Fe₂O₇ Pyrochlore Nanostructures for Spintronic Application</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Nqayi">S. Nqayi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Understanding the structural, electronic, and magnetic properties of nanomaterials is essential for developing next-generation electronic and spintronic devices, contributing to the progress of nanoscience and nanotechnology applications. Multiferroic materials, with intimately coupled ferroic-order parameters, are widely considered to breed fascinating physical properties and provide unique opportunities for the development of next-generation devices, like multistate non-volatile memory. In this study, we are set to investigate the structural, electronic, and magnetic properties of the frustrated Feᴵᴵ/Smⱽᴵ sublattice in relation to the widely studied perovskites for spintronics applications. The atomic composition, microstructure, crystallography, magnetization, thermal, and dielectric properties of a pyrochlore Sm₂Fe₂O₇ system synthesized using sol-gel methods are currently being investigated. Precursor powders were dissolved in citric acid monohydrate to obtain a solution. The obtained solution was stirred and heated using a magnetic stirrer to obtain the gel phase. Then, the gel was dried at 200°C to remove water and organic compounds and form an orange powder. The X-ray diffraction analysis confirms that the structure crystallized as a pyrochlore structure with a tetragonal F4mm (107) symmetry. The presence of Fe³⁺/Fe⁴⁺ mixed states is also revealed by XPS analysis. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nanostructures" title="nanostructures">nanostructures</a>, <a href="https://publications.waset.org/abstracts/search?q=multiferroic%20materials" title=" multiferroic materials"> multiferroic materials</a>, <a href="https://publications.waset.org/abstracts/search?q=pyrochlores" title=" pyrochlores"> pyrochlores</a>, <a href="https://publications.waset.org/abstracts/search?q=spintronics" title=" spintronics"> spintronics</a> </p> <a href="https://publications.waset.org/abstracts/181464/structural-magnetic-and-dielectric-studies-of-tetragonally-ordered-sm2fe2o7-pyrochlore-nanostructures-for-spintronic-application" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/181464.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">60</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1</span> Super-Exchange Coupling in Oxygen Rich Rare-Earth Based Sm₂MnRuO₆₊δ Double Perovskite</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Nqayi">S. Nqayi</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Sondezi"> B. Sondezi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A rare-earth-based Sm₂MnRuO₆₊δ (SMRO) double perovskite was prepared using a high-temperature solid-state reaction. The structural, morphological, chemical, thermodynamic, and magnetic properties were measured with X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), X-ray photoemission spectroscopy (XPS), and vibrating sample magnetometer (VSM), respectively. The XRD revealed a tetragonal structure belonging to the I4/mmm space group, number 139, with linear Mn−O−Ru bonds. Replacing the well-studied alkaline earth metal with a rare-earth element increased the Mn-O bond length difference between the shorter equatorial (Mn-Oab) and the axial (Mn-Oc) bonds by approximately 6.3%. The elemental composition showed an O-rich double perovskite with a Ru deficit, which encourages the formation of a Ru⁶⁺ (d²) state. XPS spectra of Sm-3d, Ru-3d, and Mn-2p revealed the coexistence of a double oxidation state for each cation; Sm²⁺, Sm³⁺, Ru³⁺, Ru⁶⁺, Mn²⁺ , and Mn³⁺, in varying proportions. Entropy studies showed drastic ordering of spins at low temperatures (up to 12.4 K), whilst increasing temperatures above this point resulted in a drastic increase of disorder of the spins (up to 43.26 K), beyond which a constant slope of entropy is observed. Magnetic measurements revealed two magnetic ground states at TN = 12.4 K and TC = 43.3 K ordering antiferromagnetically (AFM) and ferromagnetically (FM), respectively. Kneller fit further showed that the materials become completely paramagnetic at TB = 88.1 K, (the blocking temperature). The existence of ferromagnetic (FM) super-exchange coupling in this work originating from Mn³⁺ (t³₂𝓰e¹𝓰)−O−Ru³⁺ (t⁵₂𝓰e⁰𝓰) and Mn²⁺ (t³₂𝓰e²𝓰−O−Ru⁶⁺ (t²₂𝓰e⁰𝓰) which plays an important role in suppressing the Mn/Ru−O−Mn/Ru antiferromagnetic (AFM) interactions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=solid-state%20reaction" title="solid-state reaction">solid-state reaction</a>, <a href="https://publications.waset.org/abstracts/search?q=super-exchange%20coupling" title=" super-exchange coupling"> super-exchange coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=ferromagnetic" title=" ferromagnetic"> ferromagnetic</a>, <a href="https://publications.waset.org/abstracts/search?q=Kneller%E2%80%99s%20law" title=" Kneller’s law"> Kneller’s law</a>, <a href="https://publications.waset.org/abstracts/search?q=entropy" title=" entropy"> entropy</a> </p> <a href="https://publications.waset.org/abstracts/191534/super-exchange-coupling-in-oxygen-rich-rare-earth-based-sm2mnruo6d-double-perovskite" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/191534.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">25</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates its 16th foundational anniversary</a></li> </ul> </div> <div 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Search results for: S. Nqayi