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class="vector-toc-link" href="#Delta"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1.4</span> <span>Delta</span> </div> </a> <ul id="toc-Delta-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Epsilon" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Epsilon"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1.5</span> <span>Epsilon</span> </div> </a> <ul id="toc-Epsilon-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-High_pressure_form" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#High_pressure_form"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1.6</span> <span>High pressure form</span> </div> </a> <ul id="toc-High_pressure_form-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Hydrates" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Hydrates"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1.7</span> <span>Hydrates</span> </div> </a> <ul id="toc-Hydrates-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Molecular_forms" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Molecular_forms"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Molecular forms</span> </div> </a> <ul id="toc-Molecular_forms-sublist" class="vector-toc-list"> <li id="toc-Gas_phase" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Gas_phase"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2.1</span> <span>Gas phase</span> </div> </a> <ul id="toc-Gas_phase-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Matrix_isolation" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Matrix_isolation"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2.2</span> <span>Matrix isolation</span> </div> </a> <ul id="toc-Matrix_isolation-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Computational_study" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Computational_study"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2.3</span> <span>Computational study</span> </div> </a> <ul id="toc-Computational_study-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Cubic_form_of_uranium_trioxide" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cubic_form_of_uranium_trioxide"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Cubic form of uranium trioxide</span> </div> </a> <ul id="toc-Cubic_form_of_uranium_trioxide-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Reactivity" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Reactivity"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Reactivity</span> </div> </a> <button aria-controls="toc-Reactivity-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Reactivity subsection</span> </button> <ul id="toc-Reactivity-sublist" class="vector-toc-list"> <li id="toc-Electrochemical_modification" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Electrochemical_modification"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Electrochemical modification</span> </div> </a> <ul id="toc-Electrochemical_modification-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Amphoterism_and_reactivity_to_form_related_uranium(VI)_anions_and_cations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Amphoterism_and_reactivity_to_form_related_uranium(VI)_anions_and_cations"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Amphoterism and reactivity to form related uranium(VI) anions and cations</span> </div> </a> <ul id="toc-Amphoterism_and_reactivity_to_form_related_uranium(VI)_anions_and_cations-sublist" class="vector-toc-list"> <li id="toc-As_an_acid" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#As_an_acid"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.1</span> <span>As an acid</span> </div> </a> <ul id="toc-As_an_acid-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-As_a_base" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#As_a_base"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2.2</span> <span>As a base</span> </div> </a> <ul id="toc-As_a_base-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Uranium_oxides_in_ceramics" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Uranium_oxides_in_ceramics"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Uranium oxides in ceramics</span> </div> </a> <ul id="toc-Uranium_oxides_in_ceramics-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" 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class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Oxid_uranov%C3%BD" title="Oxid uranový – Czech" lang="cs" hreflang="cs" data-title="Oxid uranový" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Uran(VI)-oxid" title="Uran(VI)-oxid – German" lang="de" hreflang="de" data-title="Uran(VI)-oxid" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AA%D8%B1%DB%8C%E2%80%8C%D8%A7%DA%A9%D8%B3%DB%8C%D8%AF_%D8%A7%D9%88%D8%B1%D8%A7%D9%86%DB%8C%D9%85" title="تری‌اکسید اورانیم – Persian" lang="fa" hreflang="fa" data-title="تری‌اکسید اورانیم" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Trioxyde_d%27uranium" title="Trioxyde d'uranium – French" lang="fr" hreflang="fr" data-title="Trioxyde d'uranium" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Triossido_di_uranio" title="Triossido di uranio – Italian" lang="it" hreflang="it" data-title="Triossido di uranio" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Ur%C3%A1n-trioxid" title="Urán-trioxid – Hungarian" lang="hu" hreflang="hu" data-title="Urán-trioxid" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%85%B8%E5%8C%96%E3%82%A6%E3%83%A9%E3%83%B3(VI)" title="酸化ウラン(VI) – Japanese" lang="ja" hreflang="ja" data-title="酸化ウラン(VI)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Tri%C3%B3xido_de_ur%C3%A2nio" title="Trióxido de urânio – Portuguese" lang="pt" hreflang="pt" data-title="Trióxido de urânio" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Trioxid_de_uraniu" title="Trioxid de uraniu – Romanian" lang="ro" hreflang="ro" data-title="Trioxid de uraniu" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9E%D0%BA%D1%81%D0%B8%D0%B4_%D1%83%D1%80%D0%B0%D0%BD%D0%B0(VI)" title="Оксид урана(VI) – Russian" lang="ru" hreflang="ru" data-title="Оксид урана(VI)" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Uranium_trioxide" title="Uranium trioxide – Simple English" lang="en-simple" hreflang="en-simple" data-title="Uranium trioxide" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Uraanitrioksidi" title="Uraanitrioksidi – Finnish" lang="fi" hreflang="fi" data-title="Uraanitrioksidi" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Urani(VI)_oxide" title="Urani(VI) oxide – Vietnamese" lang="vi" hreflang="vi" data-title="Urani(VI) oxide" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E4%B8%89%E6%B0%A7%E5%8C%96%E9%93%80" title="三氧化铀 – Chinese" lang="zh" hreflang="zh" data-title="三氧化铀" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet 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id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p> <style data-mw-deduplicate="TemplateStyles:r1084375498">.mw-parser-output .ib-chembox{border-collapse:collapse;text-align:left}.mw-parser-output .ib-chembox td,.mw-parser-output .ib-chembox th{border:1px solid #a2a9b1;width:40%}.mw-parser-output .ib-chembox td+td{width:60%}</style> </p> <table class="infobox ib-chembox"> <caption>Uranium trioxide </caption> <tbody><tr> <td colspan="2" style="text-align:center; padding:2px;"><span typeof="mw:File"><a href="/wiki/File:UO3_gamma_lattice.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/UO3_gamma_lattice.png/220px-UO3_gamma_lattice.png" decoding="async" width="220" height="139" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/UO3_gamma_lattice.png/330px-UO3_gamma_lattice.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/UO3_gamma_lattice.png/440px-UO3_gamma_lattice.png 2x" data-file-width="851" data-file-height="539" /></a></span> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Names </th></tr> <tr> <td colspan="2" style="text-align:left;"><a href="/wiki/Chemical_nomenclature" title="Chemical nomenclature">IUPAC names</a> <div style="max-width:22em; word-wrap:break-word; padding-left:1.7em;">Uranium trioxide<br />Uranium(VI) oxide</div> </td></tr> <tr> <td colspan="2" style="text-align:left;">Other names <div style="max-width:22em; word-wrap:break-word; padding-left:1.7em;">Uranyl oxide<br />Uranic oxide</div> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Identifiers </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/CAS_Registry_Number" title="CAS Registry Number">CAS Number</a></div> </td> <td><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><span title="commonchemistry.cas.org"><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=1344-58-7">1344-58-7</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></li></ul></div> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">3D model (<a href="/wiki/JSmol" class="mw-redirect" title="JSmol">JSmol</a>)</div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="chemapps.stolaf.edu (3D interactive model)"><a rel="nofollow" class="external text" href="https://chemapps.stolaf.edu/jmol/jmol.php?model=O%3D%5BU%5D%28%3DO%29%3DO">Interactive image</a></span></li></ul></div> </td></tr> <tr> <td><a href="/wiki/ChemSpider" title="ChemSpider">ChemSpider</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="www.chemspider.com"><a rel="nofollow" class="external text" href="https://www.chemspider.com/Chemical-Structure.66635.html">66635</a></span></li></ul></div> </td></tr> <tr> <td><a href="/wiki/ECHA_InfoCard" class="mw-redirect" title="ECHA InfoCard"><span title="echa.europa.eu">ECHA InfoCard</span></a> </td> <td><a rel="nofollow" class="external text" href="https://echa.europa.eu/substance-information/-/substanceinfo/100.014.274">100.014.274</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q425420#P2566" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span> </td></tr> <tr> <td><a href="/wiki/European_Community_number" title="European Community number"><span title="European Community number (chemical identifier)">EC Number</span></a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li>215-701-9</li></ul></div> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/PubChem" title="PubChem">PubChem</a> <abbr title="Compound ID">CID</abbr></div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="pubchem.ncbi.nlm.nih.gov"><a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov/compound/74013">74013</a></span></li></ul></div> </td></tr> <tr> <td><a href="/wiki/Unique_Ingredient_Identifier" title="Unique Ingredient Identifier">UNII</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="precision.fda.gov"><a rel="nofollow" class="external text" href="https://precision.fda.gov/uniisearch/srs/unii/Q47SFG7DIQ">Q47SFG7DIQ</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></li></ul></div> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/CompTox_Chemicals_Dashboard" title="CompTox Chemicals Dashboard">CompTox Dashboard</a> <span style="font-weight:normal">(<abbr title="U.S. Environmental Protection Agency">EPA</abbr>)</span></div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="comptox.epa.gov"><a rel="nofollow" class="external text" href="https://comptox.epa.gov/dashboard/chemical/details/DTXSID901014433">DTXSID901014433</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q425420#P3117" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></li></ul></div> </td></tr> <tr> <td colspan="2"><div class="collapsible-list mw-collapsible mw-collapsed" style="text-align: left;"> <div style="line-height: 1.6em; font-weight: bold; text-align:left; font-weight:normal; background:transparent;"><div><a href="/wiki/International_Chemical_Identifier" title="International Chemical Identifier">InChI</a></div></div> <ul class="mw-collapsible-content" style="margin-top: 0; margin-bottom: 0; line-height: inherit; list-style: none; margin-left: 0; word-break:break-all;"><li style="line-height: inherit; margin: 0"><div style="border-top:1px solid #ccc; padding:0.2em 0 0.2em 1.5em; text-align:left;"><div style="word-wrap:break-word; text-indent:-1.5em; font-size:97%; line-height:120%;">InChI=1S/3O.U</div><div style="word-wrap:break-word; text-indent:-1.5em; font-size:97%; line-height:120%;">Key: JCMLRUNDSXARRW-UHFFFAOYSA-N</div></div></li></ul> </div> </td></tr> <tr> <td colspan="2"><div class="collapsible-list mw-collapsible mw-collapsed" style="text-align: left;"> <div style="line-height: 1.6em; font-weight: bold; text-align:left; font-weight:normal; background:transparent;"><div><a href="/wiki/Simplified_molecular-input_line-entry_system" class="mw-redirect" title="Simplified molecular-input line-entry system">SMILES</a></div></div> <ul class="mw-collapsible-content" style="margin-top: 0; margin-bottom: 0; line-height: inherit; list-style: none; margin-left: 0; word-break:break-all;"><li style="line-height: inherit; margin: 0"><div style="border-top:1px solid #ccc; padding:0.2em 0 0.2em 1.6em; word-wrap:break-word; text-indent:-1.5em; text-align:left; font-size:97%; line-height:120%;">O=[U](=O)=O</div></li></ul> </div> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Properties </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Chemical_formula" title="Chemical formula">Chemical formula</a></div> </td> <td>UO<sub>3</sub>  </td></tr> <tr> <td><a href="/wiki/Molar_mass" title="Molar mass">Molar mass</a> </td> <td>286.29 g/mol    </td></tr> <tr> <td>Appearance </td> <td>yellow-orange powder </td></tr> <tr> <td><a href="/wiki/Density" title="Density">Density</a> </td> <td>5.5–8.7 g/cm<sup>3</sup> </td></tr> <tr> <td><a href="/wiki/Melting_point" title="Melting point">Melting point</a> </td> <td>~200–650 °C (decomposes) </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Aqueous_solution" title="Aqueous solution">Solubility in water</a></div> </td> <td>insoluble </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Structure </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Crystal_structure" title="Crystal structure">Crystal structure</a></div> </td> <td><i>see text</i> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Space_group" title="Space group">Space group</a></div> </td> <td><i>I</i>4<sub>1</sub>/amd (<i>γ</i>-UO<sub>3</sub>) </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Thermochemistry </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Standard_molar_entropy" title="Standard molar entropy">Std molar<br />entropy</a> <span style="font-size:112%;">(<i>S</i><sup>⦵</sup><sub>298</sub>)</span></div> </td> <td>99 J·mol<sup>−1</sup>·K<sup>−1</sup><sup id="cite_ref-b1_1-0" class="reference"><a href="#cite_note-b1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Standard_enthalpy_change_of_formation" class="mw-redirect" title="Standard enthalpy change of formation">Std enthalpy of<br />formation</a> <span style="font-size:112%;">(Δ<sub>f</sub><i>H</i><sup>⦵</sup><sub>298</sub>)</span></div> </td> <td>−1230 kJ·mol<sup>−1</sup><sup id="cite_ref-b1_1-1" class="reference"><a href="#cite_note-b1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Hazards </th></tr> <tr> <td colspan="2" style="text-align:left; background-color:#eaeaea;"><a href="/wiki/Globally_Harmonized_System_of_Classification_and_Labelling_of_Chemicals" title="Globally Harmonized System of Classification and Labelling of Chemicals"><b>GHS</b> labelling</a>: </td></tr> <tr> <td style="padding-left:1em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/GHS_hazard_pictograms" title="GHS hazard pictograms">Pictograms</a></div> </td> <td><span typeof="mw:File"><a href="/wiki/File:GHS-pictogram-skull.svg" class="mw-file-description" title="GHS06: Toxic"><img alt="GHS06: Toxic" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/58/GHS-pictogram-skull.svg/50px-GHS-pictogram-skull.svg.png" decoding="async" width="50" height="50" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/58/GHS-pictogram-skull.svg/75px-GHS-pictogram-skull.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/58/GHS-pictogram-skull.svg/100px-GHS-pictogram-skull.svg.png 2x" data-file-width="724" data-file-height="724" /></a></span><span typeof="mw:File"><a href="/wiki/File:GHS-pictogram-silhouette.svg" class="mw-file-description" title="GHS08: Health hazard"><img alt="GHS08: Health hazard" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/GHS-pictogram-silhouette.svg/50px-GHS-pictogram-silhouette.svg.png" decoding="async" width="50" height="50" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/GHS-pictogram-silhouette.svg/75px-GHS-pictogram-silhouette.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/21/GHS-pictogram-silhouette.svg/100px-GHS-pictogram-silhouette.svg.png 2x" data-file-width="724" data-file-height="724" /></a></span><span typeof="mw:File"><a href="/wiki/File:GHS-pictogram-pollu.svg" class="mw-file-description" title="GHS09: Environmental hazard"><img alt="GHS09: Environmental hazard" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b9/GHS-pictogram-pollu.svg/50px-GHS-pictogram-pollu.svg.png" decoding="async" width="50" height="50" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b9/GHS-pictogram-pollu.svg/75px-GHS-pictogram-pollu.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b9/GHS-pictogram-pollu.svg/100px-GHS-pictogram-pollu.svg.png 2x" data-file-width="724" data-file-height="724" /></a></span> </td></tr> <tr> <td style="padding-left:1em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Globally_Harmonized_System_of_Classification_and_Labelling_of_Chemicals#Signal_word" title="Globally Harmonized System of Classification and Labelling of Chemicals">Signal word</a></div> </td> <td><b>Danger</b> </td></tr> <tr> <td style="padding-left:1em;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/GHS_hazard_statements" title="GHS hazard statements">Hazard statements</a></div> </td> <td><abbr class="abbr" title="H300: Fatal if swallowed">H300</abbr>, <abbr class="abbr" title="H330: Fatal if inhaled">H330</abbr>, <abbr class="abbr" title="H373: May cause damage to organs through prolonged or repeated exposure">H373</abbr>, <abbr class="abbr" title="H411: Toxic to aquatic life with long lasting effects">H411</abbr> </td></tr> <tr> <td><a href="/wiki/NFPA_704" title="NFPA 704"><b>NFPA 704</b></a> (fire diamond) </td> <td><style data-mw-deduplicate="TemplateStyles:r1170367383">.mw-parser-output .nfpa-704-diamond-ref{float:right;padding:1px;text-align:right}.mw-parser-output .nfpa-704-diamond-container{width:82px;font-family:sans-serif;margin:0 auto}.mw-parser-output .nfpa-704-diamond-container-ref{float:left;margin-left:1em}.mw-parser-output .nfpa-704-diamond-images{float:left;font-size:20px;text-align:center;position:relative;height:80px;width:80px;padding:1px}.mw-parser-output .nfpa-704-diamond-map{position:absolute;height:80px;width:80px}.mw-parser-output .nfpa-704-diamond .noresize{margin:0 auto}.mw-parser-output .nfpa-704-diamond-code{line-height:1em;text-align:center;position:absolute}.mw-parser-output .nfpa-704-diamond-code>a{color:black}.mw-parser-output .nfpa-704-diamond-blue{width:13px;top:31px;left:15px}.mw-parser-output .nfpa-704-diamond-red{width:12px;top:12px;left:35px}.mw-parser-output .nfpa-704-diamond-yellow{width:13px;top:31px;left:54px}.mw-parser-output .nfpa-704-diamond-white-image{position:relative;top:51px;left:0}.mw-parser-output .nfpa-704-diamond-white-text{vertical-align:middle;text-align:center;line-height:80%;position:absolute;top:52px}.mw-parser-output .nfpa-704-diamond-white-text a>span{position:absolute;color:black}.mw-parser-output .nfpa-704-diamond-white-wors{font-size:15px;width:23px;left:29px}.mw-parser-output .nfpa-704-diamond-white-wox{font-size:15px;font-stretch:condensed;width:21px;line-height:80%;top:-4px;left:29px}.mw-parser-output .nfpa-704-diamond-white-abcp{font-size:13.5px;font-stretch:condensed;width:28px;left:26px}.mw-parser-output .nfpa-704-diamond-white-ac{font-size:10px;width:30px;left:25px}.mw-parser-output .nfpa-704-diamond-white-strike{text-decoration:line-through}</style><div class="nfpa-704-diamond notheme"><div class="nfpa-704-diamond-container"><div class="nfpa-704-diamond-images nounderlines"> <div class="nfpa-704-diamond-map"><figure class="noresize" typeof="mw:File"><span><img alt="NFPA 704 four-colored diamond" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/80px-NFPA_704.svg.png" decoding="async" width="80" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/120px-NFPA_704.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/160px-NFPA_704.svg.png 2x" data-file-width="512" data-file-height="512" usemap="#ImageMap_ddaaba9e4636807a" /></span><map name="ImageMap_ddaaba9e4636807a"><area href="/wiki/NFPA_704#Blue" shape="poly" coords="23,23,47,47,23,70,0,47" alt="Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas" title="Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas" /><area href="/wiki/NFPA_704#Red" shape="poly" coords="47,0,70,23,47,47,23,23" alt="Flammability 0: Will not burn. E.g. water" title="Flammability 0: Will not burn. E.g. water" /><area href="/wiki/NFPA_704#Yellow" shape="poly" coords="70,23,94,47,70,70,47,47" alt="Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium" title="Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium" /><area href="/wiki/NFPA_704#White" shape="poly" coords="47,47,70,70,47,94,23,70" alt="Special hazard OX: Oxidizer. E.g. potassium perchlorate" title="Special hazard OX: Oxidizer. E.g. potassium perchlorate" /></map><figcaption></figcaption></figure></div><div class="nfpa-704-diamond-code nfpa-704-diamond-blue"> <a href="/wiki/NFPA_704#Blue" title="NFPA 704"><span title="Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas" class="notheme mw-no-invert">4</span></a></div><div class="nfpa-704-diamond-code nfpa-704-diamond-red"> <a href="/wiki/NFPA_704#Red" title="NFPA 704"><span title="Flammability 0: Will not burn. E.g. water" class="notheme mw-no-invert">0</span></a></div><div class="nfpa-704-diamond-code nfpa-704-diamond-yellow"> <a href="/wiki/NFPA_704#Yellow" title="NFPA 704"><span title="Instability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calcium" class="notheme mw-no-invert">1</span></a></div><div class="nfpa-704-diamond-white-text mw-no-invert"><a href="/wiki/NFPA_704#White" title="NFPA 704"><span class="nfpa-704-diamond-white-wors" title="Special hazard OX: Oxidizer. E.g. potassium perchlorate">OX</span></a></div></div></div></div> </td></tr> <tr> <td><a href="/wiki/Flash_point" title="Flash point">Flash point</a> </td> <td>Non-flammable </td></tr> <tr> <td><a href="/wiki/Safety_data_sheet" title="Safety data sheet">Safety data sheet</a> (SDS) </td> <td><a rel="nofollow" class="external text" href="http://www.ibilabs.com/UO3-MSDS.htm">External MSDS</a> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Related compounds </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Related <a href="/wiki/Uranium" title="Uranium">uranium</a> <a href="/wiki/Oxide" title="Oxide">oxides</a></div> </td> <td><a href="/wiki/Uranium_dioxide" title="Uranium dioxide">Uranium dioxide</a><br /><a href="/wiki/Triuranium_octoxide" title="Triuranium octoxide">Triuranium octoxide</a> </td></tr> <tr> <td colspan="2" style="text-align:left; background:#f8eaba; border:1px solid #a2a9b1;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Except where otherwise noted, data are given for materials in their <a href="/wiki/Standard_state" title="Standard state">standard state</a> (at 25 °C [77 °F], 100 kPa).</div> <div style="margin-top: 0.3em;"><div style="text-align:center;"><span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/12px-Yes_check.svg.png" decoding="async" width="12" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/18px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/24px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span> <span class="reflink plainlinks nourlexpansion"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Special:ComparePages&rev1=452010868&page2=Uranium+trioxide">verify</a></span> (<a href="/wiki/Wikipedia:WikiProject_Chemicals/Chembox_validation" title="Wikipedia:WikiProject Chemicals/Chembox validation">what is</a> <sup><span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span><span typeof="mw:File"><span><img alt="☒" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/7px-X_mark.svg.png" decoding="async" width="7" height="8" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/11px-X_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/14px-X_mark.svg.png 2x" data-file-width="525" data-file-height="600" /></span></span><span style="display:none">N</span></sup> ?) </div></div> <div style="margin-top: 0.3em; text-align: center;"><a href="/wiki/Wikipedia:Chemical_infobox#References" title="Wikipedia:Chemical infobox">Infobox references</a></div> </td></tr> </tbody></table><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Chemical compound</div> <p><b>Uranium trioxide (UO<sub>3</sub>)</b>, also called <b><a href="/wiki/Uranyl" title="Uranyl">uranyl</a> oxide</b>, <b>uranium(VI) oxide</b>, and <b>uranic oxide</b>, is the hexavalent <a href="/wiki/Oxide" title="Oxide">oxide</a> of <a href="/wiki/Uranium" title="Uranium">uranium</a>. The solid may be obtained by heating <a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">uranyl nitrate</a> to 400 °C. Its most commonly encountered <a href="/wiki/Polymorphism_(materials_science)" class="mw-redirect" title="Polymorphism (materials science)">polymorph</a> is amorphous UO<sub>3</sub>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Production_and_use">Production and use</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=1" title="Edit section: Production and use"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are three methods to generate uranium trioxide. As noted below, two are used industrially in the reprocessing of nuclear fuel and uranium enrichment. </p><p><span typeof="mw:File"><a href="/wiki/File:Uranium-trioxide-formation.png" class="mw-file-description" title="Methods of forming uranium trioxide"><img alt="Methods of forming uranium trioxide" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Uranium-trioxide-formation.png/500px-Uranium-trioxide-formation.png" decoding="async" width="500" height="231" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Uranium-trioxide-formation.png/750px-Uranium-trioxide-formation.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Uranium-trioxide-formation.png/1000px-Uranium-trioxide-formation.png 2x" data-file-width="1088" data-file-height="502" /></a></span> </p> <ol><li>U<sub>3</sub>O<sub>8</sub> can be oxidized at 500 °C with oxygen.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Note that above 750 °C even in 5 atm O<sub>2</sub> UO<sub>3</sub> decomposes into <a href="/wiki/Triuranium_octoxide" title="Triuranium octoxide">U<sub>3</sub>O<sub>8</sub></a>.<sup id="cite_ref-wheeler_3-0" class="reference"><a href="#cite_note-wheeler-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">Uranyl nitrate</a>, UO<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O can be heated to yield UO<sub>3</sub>. This occurs during the <a href="/wiki/Nuclear_reprocessing" title="Nuclear reprocessing">reprocessing of nuclear fuel</a>. Fuel rods are dissolved in <a href="/wiki/Nitric_acid" title="Nitric acid">HNO<sub>3</sub></a> to separate <a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">uranyl nitrate</a> from <a href="/wiki/Plutonium" title="Plutonium">plutonium</a> and the fission products (the <a href="/wiki/PUREX" title="PUREX">PUREX</a> method). The pure uranyl nitrate is converted to solid UO<sub>3</sub> by heating at 400 °C. After reduction with hydrogen (with other inert gas present) to <a href="/wiki/Uranium_dioxide" title="Uranium dioxide">uranium dioxide</a>, the uranium can be used in new <a href="/wiki/MOX_fuel" title="MOX fuel">MOX fuel</a> rods.</li> <li><a href="/wiki/Ammonium_diuranate" title="Ammonium diuranate">Ammonium diuranate</a> or <a href="/wiki/Sodium_diuranate" title="Sodium diuranate">sodium diuranate</a> (Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub>·6H<sub>2</sub>O) may be decomposed. <a href="/wiki/Sodium_diuranate" title="Sodium diuranate">Sodium diuranate</a>, also known as <a href="/wiki/Yellowcake" title="Yellowcake">yellowcake</a>, is converted to uranium trioxide in the <a href="/wiki/Enriched_uranium" title="Enriched uranium">enrichment of uranium</a>. <a href="/wiki/Uranium_dioxide" title="Uranium dioxide">Uranium dioxide</a> and <a href="/wiki/Uranium_tetrafluoride" title="Uranium tetrafluoride">uranium tetrafluoride</a> are intermediates in the process which ends in <a href="/wiki/Uranium_hexafluoride" title="Uranium hexafluoride">uranium hexafluoride</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></li></ol> <p>Uranium trioxide is shipped between processing facilities in the form of a gel, most often from <a href="/wiki/Mining" title="Mining">mines</a> to conversion plants. </p><p><a href="/wiki/Cameco_Corporation" class="mw-redirect" title="Cameco Corporation">Cameco Corporation</a>, which operates at the world's largest uranium refinery at <a href="/wiki/Blind_River,_Ontario" title="Blind River, Ontario">Blind River, Ontario</a>, produces high-purity uranium trioxide. </p><p>It has been reported that the corrosion of uranium in a silica rich aqueous solution forms <a href="/wiki/Uranium_dioxide" title="Uranium dioxide">uranium dioxide</a>, uranium trioxide,<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/Coffinite" title="Coffinite">coffinite</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> In pure water, <a href="/wiki/Schoepite" title="Schoepite">schoepite</a> (UO<sub>2</sub>)<sub>8</sub>O<sub>2</sub>(OH)<sub>12</sub>·12(H<sub>2</sub>O) is formed<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> in the first week and then after four months <a href="/wiki/Studtite" title="Studtite">studtite</a> (UO<sub>2</sub>)O<sub>2</sub>·4(H<sub>2</sub>O) was produced. This alteration of uranium oxide also leads to the formation of <a href="/wiki/Metastudtite" class="mw-redirect" title="Metastudtite">metastudtite</a>,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> a more stable uranyl peroxide, often found in the surface of spent nuclear fuel exposed to water. Reports on the corrosion of uranium metal have been published by the <a href="/wiki/Royal_Society" title="Royal Society">Royal Society</a>.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Health_and_safety_hazards">Health and safety hazards</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=2" title="Edit section: Health and safety hazards"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Like all hexavalent uranium compounds, UO<sub>3</sub> is hazardous by inhalation, ingestion, and through skin contact. It is a poisonous, slightly radioactive substance, which may cause shortness of breath, coughing, acute arterial lesions, and changes in the chromosomes of <a href="/wiki/White_blood_cell" title="White blood cell">white blood cells</a> and <a href="/wiki/Gonads" class="mw-redirect" title="Gonads">gonads</a> leading to <a href="/wiki/Congenital_disorder" class="mw-redirect" title="Congenital disorder">congenital malformations</a> if inhaled.<sup id="cite_ref-morrow_12-0" class="reference"><a href="#cite_note-morrow-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> However, once ingested, uranium is mainly toxic for the <a href="/wiki/Kidney" title="Kidney">kidneys</a> and may severely affect their function. </p> <div class="mw-heading mw-heading2"><h2 id="Structure">Structure</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=3" title="Edit section: Structure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Solid_state_structure">Solid state structure</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=4" title="Edit section: Solid state structure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The only well characterized binary trioxide of any <a href="/wiki/Actinide" title="Actinide">actinide</a> is UO<sub>3</sub>, of which several <a href="/wiki/Polymorphism_(materials_science)" class="mw-redirect" title="Polymorphism (materials science)">polymorphs</a> are known. Solid UO<sub>3</sub> loses O<sub>2</sub> on heating to give green-colored <a href="/wiki/Triuranium_octaoxide" class="mw-redirect" title="Triuranium octaoxide">U<sub>3</sub>O<sub>8</sub></a>: reports of the decomposition temperature in air vary from 200 to 650 °C. Heating at 700 °C under H<sub>2</sub> gives dark brown <a href="/wiki/Uranium_dioxide" title="Uranium dioxide">uranium dioxide</a> (UO<sub>2</sub>), which is used in <a href="/wiki/MOX_fuel" title="MOX fuel">MOX</a> <a href="/wiki/Nuclear_fuel" title="Nuclear fuel">nuclear fuel</a> rods. </p> <div class="mw-heading mw-heading4"><h4 id="Alpha">Alpha</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=5" title="Edit section: Alpha"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table border="1" cellpadding="3" cellspacing="0"> <tbody><tr> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:UO3alphalattice.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/UO3alphalattice.jpg/100px-UO3alphalattice.jpg" decoding="async" width="100" height="138" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fe/UO3alphalattice.jpg/150px-UO3alphalattice.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fe/UO3alphalattice.jpg/200px-UO3alphalattice.jpg 2x" data-file-width="533" data-file-height="734" /></a><figcaption></figcaption></figure> </td> <td><i>The α (alpha) form: a layered solid where the 2D layers are linked by oxygen atoms (shown in red)</i> </td> <td>Hydrated uranyl peroxide formed by the addition of <a href="/wiki/Hydrogen_peroxide" title="Hydrogen peroxide">hydrogen peroxide</a> to an aqueous solution of <a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">uranyl nitrate</a> when heated to 200–225 °C forms an amorphous uranium trioxide which on heating to 400–450 °C will form alpha-uranium trioxide.<sup id="cite_ref-wheeler_3-1" class="reference"><a href="#cite_note-wheeler-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It has been stated that the presence of nitrate will lower the temperature at which the <a href="/wiki/Exothermic" class="mw-redirect" title="Exothermic">exothermic</a> change from the <a href="/wiki/Amorphous" class="mw-redirect" title="Amorphous">amorphous</a> form to the alpha form occurs.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Beta">Beta</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=6" title="Edit section: Beta"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table border="1" cellpadding="3" cellspacing="0"> <tbody><tr> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:UO3betalattice.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/UO3betalattice.jpg/150px-UO3betalattice.jpg" decoding="async" width="150" height="148" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/UO3betalattice.jpg/225px-UO3betalattice.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/UO3betalattice.jpg/300px-UO3betalattice.jpg 2x" data-file-width="735" data-file-height="727" /></a><figcaption></figcaption></figure> </td> <td><i>The β (beta) UO<sub>3</sub> form: This solid contains multiple unique uranium sites and distorted polyhedra.</i> </td> <td>This form can be formed by heating ammonium diuranate, while P.C. Debets and B.O. Loopstra, found four solid phases in the UO<sub>3</sub>-H<sub>2</sub>O-NH<sub>3</sub> system that they could all be considered as being UO<sub>2</sub>(OH)<sub>2</sub>·H<sub>2</sub>O where some of the water has been replaced with ammonia.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> It was found that <a href="/wiki/Calcination" title="Calcination">calcination</a> at 500 °C in air forms the beta form of uranium trioxide.<sup id="cite_ref-wheeler_3-2" class="reference"><a href="#cite_note-wheeler-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Later experiments found the most reliable method for synthesizing pure β-UO<sub>3</sub> was to calcinate uranyl nitrate hexahydrate at 450 °C for 6 days and cool slowly over 24 hours.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Gamma">Gamma</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=7" title="Edit section: Gamma"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table border="1" cellpadding="3" cellspacing="0"> <tbody><tr> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:UO3_gamma_lattice.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/UO3_gamma_lattice.jpg/150px-UO3_gamma_lattice.jpg" decoding="async" width="150" height="95" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/UO3_gamma_lattice.jpg/225px-UO3_gamma_lattice.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/03/UO3_gamma_lattice.jpg/300px-UO3_gamma_lattice.jpg 2x" data-file-width="851" data-file-height="539" /></a><figcaption></figcaption></figure> </td> <td><i>The γ (gamma) form: with the different uranium environments in green and yellow</i> </td> <td>The most frequently encountered polymorph is γ-UO<sub>3</sub>, whose <a href="/wiki/X-ray_crystallography" title="X-ray crystallography">x-ray structure</a> has been solved from powder diffraction data. The compound crystallizes in the space group <i>I4<sub>1</sub>/amd</i> with two uranium atoms in the asymmetric unit. Both are surrounded by somewhat distorted octahedra of oxygen atoms. One uranium atom has two closer and four more distant oxygen atoms whereas the other has four close and two more distant oxygen atoms as neighbors. Thus it is not incorrect to describe the structure as [UO<sub>2</sub>]<sup>2+</sup>[UO<sub>4</sub>]<sup>2− </sup>, that is uranyl uranate.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <table border="1" cellpadding="3" cellspacing="0"> <tbody><tr> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:UO3_gamma_env1.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/UO3_gamma_env1.jpg/150px-UO3_gamma_env1.jpg" decoding="async" width="150" height="113" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/UO3_gamma_env1.jpg/225px-UO3_gamma_env1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2a/UO3_gamma_env1.jpg/300px-UO3_gamma_env1.jpg 2x" data-file-width="1024" data-file-height="768" /></a><figcaption></figcaption></figure> </td> <td><i>The environment of the uranium atoms shown as yellow in the gamma form</i> </td> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:UO3_gamma_rings.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/34/UO3_gamma_rings.jpg/150px-UO3_gamma_rings.jpg" decoding="async" width="150" height="83" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/34/UO3_gamma_rings.jpg/225px-UO3_gamma_rings.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/34/UO3_gamma_rings.jpg/300px-UO3_gamma_rings.jpg 2x" data-file-width="859" data-file-height="473" /></a><figcaption></figcaption></figure> </td> <td><i>The chains of U<sub>2</sub>O<sub>2</sub> rings in the gamma form in layers, alternate layers running at 90 degrees to each other. These chains are shown as containing the yellow uranium atoms, in an octahedral environment which are distorted towards square planar by an elongation of the <a href="/wiki/Axis_of_rotation" class="mw-redirect" title="Axis of rotation">axial</a> <a href="/wiki/Oxygen" title="Oxygen">oxygen</a>-<a href="/wiki/Uranium" title="Uranium">uranium</a> bonds.</i> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Delta">Delta</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=8" title="Edit section: Delta"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table border="1" cellpadding="3" cellspacing="0"> <tbody><tr> <td><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:UO3lattice.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/UO3lattice.jpg/150px-UO3lattice.jpg" decoding="async" width="150" height="113" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/UO3lattice.jpg/225px-UO3lattice.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ee/UO3lattice.jpg/300px-UO3lattice.jpg 2x" data-file-width="1024" data-file-height="768" /></a><figcaption></figcaption></figure> </td> <td><i>The delta (δ) form is a <a href="/wiki/Cubic_(crystal_system)" class="mw-redirect" title="Cubic (crystal system)">cubic</a> solid where the oxygen atoms are arranged between the uranium atoms.</i><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Epsilon">Epsilon</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=9" title="Edit section: Epsilon"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table border="1" cellpadding="3" cellspacing="0"> <tbody><tr> <td> <figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:EpsilonUO3.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/EpsilonUO3.jpg/150px-EpsilonUO3.jpg" decoding="async" width="150" height="137" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/EpsilonUO3.jpg/225px-EpsilonUO3.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/92/EpsilonUO3.jpg/300px-EpsilonUO3.jpg 2x" data-file-width="969" data-file-height="882" /></a><figcaption></figcaption></figure> </td> <td><i>The proposed crystal structure of the epsilon (ε) form consists of sheets of uranium hexagonal bipyramids connected through edge-sharing polyhedra. These sheets are connected through the axial uranyl oxygen atoms. The proposed structure is in the <a href="/wiki/Triclinic_crystal_system" title="Triclinic crystal system">triclinic</a> </i>P-1<i> space group.</i><sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="High_pressure_form">High pressure form</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=10" title="Edit section: High pressure form"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There is a high-pressure solid form with U<sub>2</sub>O<sub>2</sub> and U<sub>3</sub>O<sub>3</sub> rings in it.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> <sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Hydrates">Hydrates</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=11" title="Edit section: Hydrates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Uranium_Trioxides.jpg" class="mw-file-description" title="Hydrous and anhydrous forms of UO3"><img alt="Hydrous and anhydrous forms of UO3" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Uranium_Trioxides.jpg/120px-Uranium_Trioxides.jpg" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Uranium_Trioxides.jpg/180px-Uranium_Trioxides.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Uranium_Trioxides.jpg/240px-Uranium_Trioxides.jpg 2x" data-file-width="2048" data-file-height="1536" /></a></span></div> <div class="gallerytext">Hydrous and anhydrous forms of UO<sub>3</sub></div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:UO3_Anhydrous.jpg" class="mw-file-description" title="Anhydrous forms of UO3"><img alt="Anhydrous forms of UO3" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/UO3_Anhydrous.jpg/120px-UO3_Anhydrous.jpg" decoding="async" width="120" height="110" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ee/UO3_Anhydrous.jpg/180px-UO3_Anhydrous.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ee/UO3_Anhydrous.jpg/240px-UO3_Anhydrous.jpg 2x" data-file-width="1640" data-file-height="1510" /></a></span></div> <div class="gallerytext">Anhydrous forms of UO<sub>3</sub></div> </li> </ul> <p>Several <a href="/wiki/Hydrates" class="mw-redirect" title="Hydrates">hydrates</a> of uranium trioxide are known, e.g., UO<sub>3</sub>·6H<sub>2</sub>O, which are commonly known as "uranic acid" in older literature due to their similarity in formula to various metal <a href="/wiki/Oxyacids" class="mw-redirect" title="Oxyacids">oxyacids</a>, although they are not in fact particularly acidic.<sup id="cite_ref-wheeler_3-3" class="reference"><a href="#cite_note-wheeler-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Molecular_forms">Molecular forms</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=12" title="Edit section: Molecular forms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>While uranium trioxide is encountered as a polymeric solid under ambient conditions, some work has been done on the molecular form in the gas phase, in matrix isolations studies, and computationally. </p> <div class="mw-heading mw-heading4"><h4 id="Gas_phase">Gas phase</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=13" title="Edit section: Gas phase"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>At elevated temperatures gaseous UO<sub>3</sub> is in <a href="/wiki/Chemical_equilibrium" title="Chemical equilibrium">equilibrium</a> with solid <a href="/wiki/Triuranium_octaoxide" class="mw-redirect" title="Triuranium octaoxide">U<sub>3</sub>O<sub>8</sub></a> and molecular <a href="/wiki/Oxygen" title="Oxygen">oxygen</a>. </p> <dl><dd><dl><dd>2 U<sub>3</sub>O<sub>8</sub>(s) + O<sub>2</sub>(g) ⇌ 6 UO<sub>3</sub>(g)</dd></dl></dd></dl> <p>With increasing temperature the equilibrium is shifted to the right. This system has been studied at temperatures between 900 °C and 2500 °C. The vapor pressure of monomeric UO<sub>3</sub> in equilibrium with air and solid U<sub>3</sub>O<sub>8</sub> at ambient pressure, about 10<sup>−5</sup> mbar (1 mPa) at 980 °C, rising to 0.1 mbar (10 Pa) at 1400 °C, 0.34 mbar (34 Pa) at 2100 °C, 1.9 mbar (193 Pa) at 2300 °C, and 8.1 mbar (809 Pa) at 2500 °C.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Matrix_isolation">Matrix isolation</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=14" title="Edit section: Matrix isolation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Infrared spectroscopy of molecular UO<sub>3</sub> isolated in an argon matrix indicates a T-shaped structure (<a href="/wiki/Point_group" title="Point group">point group</a> <i>C<sub>2v</sub></i>) for the molecule. This is in contrast to the commonly encountered <i>D<sub>3h</sub></i> <a href="/wiki/Molecular_symmetry" title="Molecular symmetry">molecular symmetry</a> exhibited by most trioxides. From the force constants the authors deduct the U-O bond lengths to be between 1.76 and 1.79 <a href="/wiki/%C3%85ngstr%C3%B6m" class="mw-redirect" title="Ångström">Å</a> (176 to 179 <a href="/wiki/1_E-12_m" class="mw-redirect" title="1 E-12 m">pm</a>).<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Computational_study">Computational study</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=15" title="Edit section: Computational study"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Uranium-trioxide-Pyykko-3D-balls-B.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/13/Uranium-trioxide-Pyykko-3D-balls-B.png/200px-Uranium-trioxide-Pyykko-3D-balls-B.png" decoding="async" width="200" height="149" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/13/Uranium-trioxide-Pyykko-3D-balls-B.png/300px-Uranium-trioxide-Pyykko-3D-balls-B.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/13/Uranium-trioxide-Pyykko-3D-balls-B.png/400px-Uranium-trioxide-Pyykko-3D-balls-B.png 2x" data-file-width="1100" data-file-height="821" /></a><figcaption>The calculated geometry of molecular uranium trioxide has C<sub>2v</sub> symmetry.</figcaption></figure> <p>Calculations predict that the point group of molecular UO<sub>3</sub> is <i>C<sub>2v</sub></i>, with an axial bond length of 1.75 Å, an equatorial bond length of 1.83 Å and an angle of 161° between the axial oxygens. The more symmetrical <i>D<sub>3h</sub></i> species is a saddle point, 49 kJ/mol above the <i>C<sub>2v</sub></i> minimum. The authors invoke a second-order <a href="/wiki/Jahn%E2%80%93Teller_effect" title="Jahn–Teller effect">Jahn–Teller effect</a> as explanation.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Cubic_form_of_uranium_trioxide">Cubic form of uranium trioxide</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=16" title="Edit section: Cubic form of uranium trioxide"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The crystal structure of a uranium trioxide phase of composition UO<sub>2·82</sub> has been determined by X-ray powder diffraction techniques using a Guinier-type focusing camera. The unit cell is cubic with a = 4·138 ± 0·005 kX. A uranium atom is located at (000) and oxygens at (View the MathML source), (View the MathML source), and (View the MathML source) with some anion vacancies. The compound is isostructural with ReO<sub>3</sub>. The U-O bond distance of 2·073 Å agrees with that predicted by Zachariasen for a bond strength S = 1.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Reactivity">Reactivity</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=17" title="Edit section: Reactivity"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Uranium trioxide reacts at 400 °C with <a href="/wiki/Freon-12" class="mw-redirect" title="Freon-12">freon-12</a> to form <a href="/wiki/Chlorine" title="Chlorine">chlorine</a>, <a href="/wiki/Phosgene" title="Phosgene">phosgene</a>, <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a> and <a href="/wiki/Uranium_tetrafluoride" title="Uranium tetrafluoride">uranium tetrafluoride</a>. The freon-12 can be replaced with <a href="/wiki/Freon-11" class="mw-redirect" title="Freon-11">freon-11</a> which forms <a href="/wiki/Carbon_tetrachloride" title="Carbon tetrachloride">carbon tetrachloride</a> instead of carbon dioxide. This is a case of a hard perhalogenated <a href="/wiki/Freon" title="Freon">freon</a> which is normally considered to be inert being converted chemically at a moderate temperature.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p> <dl><dd>2 CF<sub>2</sub>Cl<sub>2</sub> + UO<sub>3</sub> → UF<sub>4</sub> + CO<sub>2</sub> + COCl<sub>2</sub> + Cl<sub>2</sub></dd></dl> <dl><dd>4 CFCl<sub>3</sub> + UO<sub>3</sub> → UF<sub>4</sub> + 3 COCl<sub>2</sub> + CCl<sub>4</sub> + Cl<sub>2</sub></dd></dl> <p>Uranium trioxide can be dissolved in a mixture of <a href="/wiki/Tributyl_phosphate" title="Tributyl phosphate">tributyl phosphate</a> and <a href="/wiki/Thenoyltrifluoroacetone" title="Thenoyltrifluoroacetone">thenoyltrifluoroacetone</a> in <a href="/wiki/Supercritical_carbon_dioxide" title="Supercritical carbon dioxide">supercritical carbon dioxide</a>, ultrasound was employed during the dissolution.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Electrochemical_modification">Electrochemical modification</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=18" title="Edit section: Electrochemical modification"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The reversible insertion of <a href="/wiki/Magnesium" title="Magnesium">magnesium</a> cations into the <a href="/wiki/Crystal_structure" title="Crystal structure">lattice</a> of uranium trioxide by <a href="/wiki/Cyclic_voltammetry" title="Cyclic voltammetry">cyclic voltammetry</a> using a <a href="/wiki/Graphite" title="Graphite">graphite</a> electrode modified with microscopic particles of the uranium oxide has been investigated. This experiment has also been done for U<sub>3</sub>O<sub>8</sub>. This is an example of <a href="/wiki/Electrochemistry" title="Electrochemistry">electrochemistry</a> of a solid modified <a href="/wiki/Electrode" title="Electrode">electrode</a>, the experiment which used for uranium trioxide is related to a <a href="/wiki/Carbon_paste_electrode" title="Carbon paste electrode">carbon paste electrode</a> experiment. It is also possible to reduce uranium trioxide with <a href="/wiki/Sodium" title="Sodium">sodium</a> metal to form sodium uranium oxides.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> </p><p>It has been the case that it is possible to insert <a href="/wiki/Lithium" title="Lithium">lithium</a><sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> into the uranium trioxide lattice by electrochemical means, this is similar to the way that some <a href="/wiki/Rechargeable" class="mw-redirect" title="Rechargeable">rechargeable</a> <a href="/wiki/Lithium_ion_batteries" class="mw-redirect" title="Lithium ion batteries">lithium ion batteries</a> work. In these rechargeable cells one of the electrodes is a metal oxide which contains a metal such as <a href="/wiki/Cobalt" title="Cobalt">cobalt</a> which can be reduced, to maintain the electroneutrality for each electron which is added to the electrode material a lithium ion enters the lattice of this oxide electrode. </p> <div class="mw-heading mw-heading3"><h3 id="Amphoterism_and_reactivity_to_form_related_uranium(VI)_anions_and_cations"><span id="Amphoterism_and_reactivity_to_form_related_uranium.28VI.29_anions_and_cations"></span>Amphoterism and reactivity to form related uranium(VI) anions and cations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=19" title="Edit section: Amphoterism and reactivity to form related uranium(VI) anions and cations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Uranium oxide is <a href="/wiki/Amphoteric_(chemistry)" class="mw-redirect" title="Amphoteric (chemistry)">amphoteric</a> and reacts as <a href="/wiki/Acid" title="Acid">acid</a> and as a <a href="/wiki/Base_(chemistry)" title="Base (chemistry)">base</a>, depending on the conditions. </p> <div class="mw-heading mw-heading4"><h4 id="As_an_acid">As an acid</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=20" title="Edit section: As an acid"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dd>UO<sub>3</sub> + H<sub>2</sub>O → <span class="chemf nowrap">UO<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2−</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline">4</sub></span></span></span> + 2 H<sup>+</sup></dd></dl> <p>Dissolving uranium oxide in a strong <a href="/wiki/Base_(chemistry)" title="Base (chemistry)">base</a> like <a href="/wiki/Sodium_hydroxide" title="Sodium hydroxide">sodium hydroxide</a> forms the doubly negatively charged <a href="/wiki/Uranate" title="Uranate">uranate</a> <a href="/wiki/Anion" class="mw-redirect" title="Anion">anion</a> (<span class="chemf nowrap">UO<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2−</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline">4</sub></span></span></span>). Uranates tend to concatenate, forming <a href="/wiki/Diuranate" class="mw-redirect" title="Diuranate">diuranate</a>, <span class="chemf nowrap">U<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline"></sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline">2</sub></span></span>O<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2−</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline">7</sub></span></span></span>, or other poly-uranates. Important diuranates include <a href="/wiki/Ammonium_diuranate" title="Ammonium diuranate">ammonium diuranate</a> ((NH<sub>4</sub>)<sub>2</sub>U<sub>2</sub>O<sub>7</sub>), <a href="/wiki/Sodium_diuranate" title="Sodium diuranate">sodium diuranate</a> (Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub>) and <a href="/wiki/Magnesium_diuranate" title="Magnesium diuranate">magnesium diuranate</a> (MgU<sub>2</sub>O<sub>7</sub>), which forms part of some <a href="/wiki/Yellowcake" title="Yellowcake">yellowcakes</a>. It is worth noting that uranates of the form M<sub>2</sub>UO<sub>4</sub> do <i>not</i> contain <span class="chemf nowrap">UO<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2−</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline">4</sub></span></span></span> ions, but rather flattened UO<sub>6</sub> octahedra, containing a uranyl group and bridging oxygens.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="As_a_base">As a base</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=21" title="Edit section: As a base"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dd>UO<sub>3</sub> + H<sub>2</sub>O → <span class="chemf nowrap">UO<span class="nowrap"><span style="display:inline-block;margin-bottom:-0.3em;vertical-align:-0.4em;line-height:1em;font-size:80%;text-align:left"><sup style="font-size:inherit;line-height:inherit;vertical-align:baseline">2+</sup><br /><sub style="font-size:inherit;line-height:inherit;vertical-align:baseline">2</sub></span></span></span> + 2 OH<sup>−</sup></dd></dl> <p>Dissolving uranium oxide in a strong acid like <a href="/wiki/Sulfuric_acid" title="Sulfuric acid">sulfuric</a> or <a href="/wiki/Nitric_acid" title="Nitric acid">nitric acid</a> forms the double positive charged <a href="/wiki/Uranyl" title="Uranyl">uranyl</a> <a href="/wiki/Cation" class="mw-redirect" title="Cation">cation</a>. The <a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">uranyl nitrate</a> formed (UO<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O) is soluble in <a href="/wiki/Ether" title="Ether">ethers</a>, <a href="/wiki/Alcohol_(chemistry)" title="Alcohol (chemistry)">alcohols</a>, <a href="/wiki/Ketone" title="Ketone">ketones</a> and <a href="/wiki/Ester" title="Ester">esters</a>; for example, <a href="/wiki/Tributylphosphate" class="mw-redirect" title="Tributylphosphate">tributylphosphate</a>. This solubility is used to separate uranium from other elements in <a href="/wiki/Nuclear_reprocessing" title="Nuclear reprocessing">nuclear reprocessing</a>, which begins with the dissolution of <a href="/wiki/Nuclear_fuel" title="Nuclear fuel">nuclear fuel</a> rods in <a href="/wiki/Nitric_acid" title="Nitric acid">nitric acid</a> to form this salt. The <a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">uranyl nitrate</a> is then converted to uranium trioxide by heating. </p><p>From <a href="/wiki/Nitric_acid" title="Nitric acid">nitric acid</a> one obtains <a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">uranyl nitrate</a>, <i>trans</i>-UO<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>·2H<sub>2</sub>O, consisting of eight-coordinated uranium with two <a href="/wiki/Bidentate" class="mw-redirect" title="Bidentate">bidentate</a> nitrato ligands and two water ligands as well as the familiar O=U=O core. </p> <div class="mw-heading mw-heading2"><h2 id="Uranium_oxides_in_ceramics">Uranium oxides in ceramics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=22" title="Edit section: Uranium oxides in ceramics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>UO<sub>3</sub>-based ceramics become green or black when fired in a reducing atmosphere and yellow to orange when fired with oxygen. Orange-coloured <a href="/wiki/Fiestaware" class="mw-redirect" title="Fiestaware">Fiestaware</a> is a well-known example of a product with a uranium-based glaze. UO<sub>3</sub>-has also been used in formulations of <a href="/wiki/Vitreous_enamel" title="Vitreous enamel">enamel</a>, <a href="/wiki/Uranium_glass" title="Uranium glass">uranium glass</a>, and <a href="/wiki/Porcelain" title="Porcelain">porcelain</a>. </p><p>Prior to 1960, UO<sub>3</sub> was used as an agent of crystallization in crystalline coloured glazes. It is possible to determine with a <a href="/wiki/Geiger_counter" title="Geiger counter">Geiger counter</a> if a glaze or glass was made from UO<sub>3</sub>. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Uranium_trioxide&action=edit&section=23" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-b1-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-b1_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-b1_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFZumdahl2009" class="citation book cs1">Zumdahl SS (2009). <i>Chemical Principles 6th Ed</i>. Houghton Mifflin Company. p. A23. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-618-94690-7" title="Special:BookSources/978-0-618-94690-7"><bdi>978-0-618-94690-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Chemical+Principles+6th+Ed.&rft.pages=A23&rft.pub=Houghton+Mifflin+Company&rft.date=2009&rft.isbn=978-0-618-94690-7&rft.aulast=Zumdahl&rft.aufirst=SS&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUranium+trioxide" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSheftFriedDavidson1950" class="citation journal cs1">Sheft I, Fried S, Davidson N (1950). 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href="/wiki/Template:Uranium_compounds" title="Template:Uranium compounds"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Uranium_compounds" title="Template talk:Uranium compounds"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Uranium_compounds" title="Special:EditPage/Template:Uranium compounds"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Uranium_compounds" style="font-size:114%;margin:0 4em"><a href="/wiki/Uranium_compounds" title="Uranium compounds">Uranium compounds</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(II)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Uranium_diboride" title="Uranium diboride">UB<sub>2</sub></a></li> <li><a href="/wiki/Uranium_monosulfide" title="Uranium monosulfide">US</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(III)</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Uranium_trifluoride" title="Uranium trifluoride">UF<sub>3</sub></a></li> <li><a href="/wiki/Uranium(III)_chloride" title="Uranium(III) chloride">UCl<sub>3</sub></a></li> <li><a href="/wiki/Uranium(III)_bromide" title="Uranium(III) bromide">UBr<sub>3</sub></a></li> <li><a href="/wiki/Uranium(III)_iodide" title="Uranium(III) iodide">UI<sub>3</sub></a></li> <li><a href="/wiki/Uranium_monophosphide" title="Uranium monophosphide">UP</a></li> <li><a href="/w/index.php?title=Uranium(III)_hydroxide&action=edit&redlink=1" class="new" title="Uranium(III) hydroxide (page does not exist)">U(OH)<sub>3</sub></a></li> <li><a href="/wiki/Uranium(III)_hydride" title="Uranium(III) hydride">UH<sub>3</sub></a></li> <li><a href="/wiki/Uranium_nitrides" title="Uranium nitrides">UN</a></li></ul></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Organouranium(III)_compounds" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Organouranium_chemistry" title="Organouranium chemistry">Organouranium</a>(III) compounds</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <li><a href="/wiki/Organouranium_chemistry" title="Organouranium chemistry">U(C<sub>5</sub>H<sub>5</sub>)<sub>3</sub></a></li> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Uranium(IV)_compounds" title="Uranium(IV) compounds">U(IV)</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Uranium_borohydride" title="Uranium borohydride">U(BH<sub>4</sub>)<sub>4</sub></a></li> <li><a href="/wiki/Uranium_carbide" title="Uranium carbide">UC</a></li> <li><a href="/wiki/Uranium_tetrachloride" title="Uranium tetrachloride">UCl<sub>4</sub></a></li> <li><a href="/wiki/Uranium_tetrafluoride" title="Uranium tetrafluoride">UF<sub>4</sub></a></li> <li><a href="/wiki/Uranium_tetrabromide" title="Uranium tetrabromide">UBr<sub>4</sub></a></li> <li><a href="/wiki/Uranium(IV)_iodide" title="Uranium(IV) iodide">UI<sub>4</sub></a></li> <li><a href="/wiki/Uranium_dioxide" title="Uranium dioxide">UO<sub>2</sub></a></li> <li><a href="/wiki/Uranium(IV)_hydride" title="Uranium(IV) hydride">UH<sub>4</sub></a></li> <li><a href="/wiki/Uranium_disilicide" title="Uranium disilicide">USi<sub>2</sub></a></li> <li><a href="/wiki/Uranium_disulfide" title="Uranium disulfide">US<sub>2</sub></a></li> <li><a href="/wiki/Uranium_diselenide" title="Uranium diselenide">USe<sub>2</sub></a></li> <li><a href="/wiki/Uranium_ditelluride" title="Uranium ditelluride">UTe<sub>2</sub></a></li> <li><a href="/wiki/Uranium(IV)_sulfate" title="Uranium(IV) sulfate">U(SO<sub>4</sub>)<sub>2</sub></a></li></ul></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Organouranium(IV)_compounds" scope="row" class="navbox-group" style="width:1%">Organouranium(IV) compounds</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <li><a href="/wiki/Uranocene" title="Uranocene">U(C<sub>8</sub>H<sub>8</sub>)<sub>2</sub></a></li> <li><a href="/wiki/Tetrakis(cyclopentadienyl)uranium(IV)" title="Tetrakis(cyclopentadienyl)uranium(IV)">U(C<sub>5</sub>H<sub>5</sub>)<sub>4</sub></a></li> <li><a href="/wiki/Organouranium_chemistry" title="Organouranium chemistry">U(C<sub>5</sub>H<sub>5</sub>)<sub>3</sub>Cl</a></li> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(IV,V)</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Uranium_nitrides" title="Uranium nitrides">U<sub>2</sub>N<sub>3</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(IV,VI)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Triuranium_octoxide" title="Triuranium octoxide">U<sub>3</sub>O<sub>8</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(V)</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Uranium_pentachloride" title="Uranium pentachloride">UCl<sub>5</sub></a></li> <li><a href="/wiki/Uranium_pentafluoride" title="Uranium pentafluoride">UF<sub>5</sub></a></li> <li><a href="/wiki/Uranium_pentabromide" title="Uranium pentabromide">UBr<sub>5</sub></a></li> <li><i><a href="/wiki/Uranium#Halides" title="Uranium">UI<sub>5</sub></a></i></li> <li><a href="/wiki/Diuranium_pentoxide" title="Diuranium pentoxide">U<sub>2</sub>O<sub>5</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(VI)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ammonium_diuranate" title="Ammonium diuranate">(NH<sub>4</sub>)<sub>2</sub>U<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Sodium_diuranate" title="Sodium diuranate">Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Uranium_hexachloride" title="Uranium hexachloride">UCl<sub>6</sub></a></li> <li><a href="/wiki/Uranium_hexafluoride" title="Uranium hexafluoride">UF<sub>6</sub></a></li> <li><a href="/wiki/Uranium_phosphate" class="mw-redirect" title="Uranium phosphate">U(PO<sub>4</sub>)<sub>2</sub></a></li> <li><a class="mw-selflink selflink">UO<sub>3</sub></a></li> <li><a href="/wiki/Uranyl_peroxide" title="Uranyl peroxide">UO<sub>4</sub></a></li> <li><a href="/wiki/Uranyl_acetate" title="Uranyl acetate">UO<sub>2</sub>(CH<sub>3</sub>COO)<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_formate" title="Uranyl formate">UO<sub>2</sub>(CHO<sub>2</sub>)<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_carbonate" title="Uranyl carbonate">UO<sub>2</sub>CO<sub>3</sub></a></li> <li><a href="/wiki/Ammonium_uranyl_carbonate" title="Ammonium uranyl carbonate">UO<sub>2</sub>CO<sub>3</sub>·2(NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub></a></li> <li><a href="/wiki/Uranyl_chloride" title="Uranyl chloride">UO<sub>2</sub>Cl<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_fluoride" title="Uranyl fluoride">UO<sub>2</sub>F<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_nitrate" title="Uranyl nitrate">UO<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_hydroxide" title="Uranyl hydroxide">UO<sub>2</sub>(OH)<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_hydroxide" title="Uranyl hydroxide">(UO<sub>2</sub>)<sub>2</sub>(OH)<sub>4</sub></a></li> <li><a href="/wiki/Uranyl_sulfate" title="Uranyl sulfate">UO<sub>2</sub>(SO<sub>4</sub>)<sub>2</sub></a></li> <li><a href="/wiki/Uranyl_zinc_acetate" title="Uranyl zinc acetate">ZnUO<sub>2</sub>(CH<sub>3</sub>COO)<sub>4</sub></a></li> <li><a href="/wiki/Uranium_nitrides" title="Uranium nitrides">UN<sub>2</sub></a></li> <li><a href="/w/index.php?title=Uranic_acid&action=edit&redlink=1" class="new" title="Uranic acid (page does not exist)">H<sub>2</sub>UO<sub>4</sub></a></li> <li><a href="/w/index.php?title=Tetrasodium_tricarbonatodioxouranate&action=edit&redlink=1" class="new" title="Tetrasodium tricarbonatodioxouranate (page does not exist)">Na<sub>4</sub>UO<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">U(XII)</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Uranium_hexoxide" title="Uranium hexoxide">UO<sub>6</sub></a> (hypothetical)</i></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Oxides" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Oxides" title="Template:Oxides"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Oxides" title="Template talk:Oxides"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Oxides" title="Special:EditPage/Template:Oxides"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Oxides" style="font-size:114%;margin:0 4em"><a href="/wiki/Oxide" title="Oxide">Oxides</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Mixed oxidation states</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Antimony_tetroxide" title="Antimony tetroxide">Antimony tetroxide</a> (<a href="/wiki/Antimony" title="Antimony">Sb</a><sub>2</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Boron_suboxide" title="Boron suboxide">Boron suboxide</a> (<a href="/wiki/Boron" title="Boron">B</a><sub>12</sub>O<sub>2</sub>)</li> <li><a href="/wiki/Carbon_suboxide" title="Carbon suboxide">Carbon suboxide</a> (<a href="/wiki/Carbon" title="Carbon">C</a><sub>3</sub>O<sub>2</sub>)</li> <li><a href="/wiki/Chlorine_perchlorate" title="Chlorine perchlorate">Chlorine perchlorate</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a><sub>2</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Chloryl_perchlorate" class="mw-redirect" title="Chloryl perchlorate">Chloryl perchlorate</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a><sub>2</sub>O<sub>6</sub>)</li> <li><a href="/wiki/Cobalt(II,III)_oxide" title="Cobalt(II,III) oxide">Cobalt(II,III) oxide</a> (<a href="/wiki/Cobalt" title="Cobalt">Co</a><sub>3</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Dichlorine_pentoxide" title="Dichlorine pentoxide">Dichlorine pentoxide</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Iron(II,III)_oxide" title="Iron(II,III) oxide">Iron(II,III) oxide</a> (<a href="/wiki/Iron" title="Iron">Fe</a><sub>3</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Lead(II,IV)_oxide" title="Lead(II,IV) oxide">Lead(II,IV) oxide</a> (<a href="/wiki/Lead" title="Lead">Pb</a><sub>3</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Manganese(II,III)_oxide" title="Manganese(II,III) oxide">Manganese(II,III) oxide</a> (<a href="/wiki/Manganese" title="Manganese">Mn</a><sub>3</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Mellitic_anhydride" title="Mellitic anhydride">Mellitic anhydride</a> (<a href="/wiki/Carbon" title="Carbon">C</a><sub>12</sub>O<sub>9</sub>)</li> <li><a href="/wiki/Praseodymium(III,IV)_oxide" title="Praseodymium(III,IV) oxide">Praseodymium(III,IV) oxide</a> (<a href="/wiki/Praseodymium" title="Praseodymium">Pr</a><sub>6</sub>O<sub>11</sub>)</li> <li><a href="/wiki/Silver(I,III)_oxide" title="Silver(I,III) oxide">Silver(I,III) oxide</a> (<a href="/wiki/Silver" title="Silver">Ag</a><sub>2</sub>O<sub>2</sub>)</li> <li><a href="/wiki/Terbium(III,IV)_oxide" title="Terbium(III,IV) oxide">Terbium(III,IV) oxide</a> (<a href="/wiki/Terbium" title="Terbium">Tb</a><sub>4</sub>O<sub>7</sub>)</li> <li><a href="/wiki/Tribromine_octoxide" title="Tribromine octoxide">Tribromine octoxide</a> (<a href="/wiki/Bromine" title="Bromine">Br</a><sub>3</sub>O<sub>8</sub>)</li> <li><a href="/wiki/Triuranium_octoxide" title="Triuranium octoxide">Triuranium octoxide</a> (<a href="/wiki/Uranium" title="Uranium">U</a><sub>3</sub>O<sub>8</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+1 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aluminium(I)_oxide" title="Aluminium(I) oxide">Aluminium(I) oxide</a> (<a href="/wiki/Aluminium" title="Aluminium">Al</a><sub>2</sub>O)</li> <li><a href="/wiki/Copper(I)_oxide" title="Copper(I) oxide">Copper(I) oxide</a> (<a href="/wiki/Copper" title="Copper">Cu</a><sub>2</sub>O)</li> <li><a href="/wiki/Caesium_monoxide" title="Caesium monoxide">Caesium monoxide</a> (<a href="/wiki/Caesium" title="Caesium">Cs</a><sub>2</sub>O)</li> <li><a href="/wiki/Dibromine_monoxide" title="Dibromine monoxide">Dibromine monoxide</a> (<a href="/wiki/Bromine" title="Bromine">Br</a><sub>2</sub>O)</li> <li><a href="/wiki/Dicarbon_monoxide" title="Dicarbon monoxide">Dicarbon monoxide</a> (<a href="/wiki/Carbon" title="Carbon">C</a><sub>2</sub>O)</li> <li><a href="/wiki/Dichlorine_monoxide" title="Dichlorine monoxide">Dichlorine monoxide</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a><sub>2</sub>O)</li> <li><a href="/wiki/Gallium(I)_oxide" title="Gallium(I) oxide">Gallium(I) oxide</a> (<a href="/wiki/Gallium" title="Gallium">Ga</a><sub>2</sub>O)</li> <li><a href="/wiki/Iodine(I)_oxide" class="mw-redirect" title="Iodine(I) oxide">Iodine(I) oxide</a> (<a href="/wiki/Iodine" title="Iodine">I</a><sub>2</sub>O)</li> <li><a href="/wiki/Lithium_oxide" title="Lithium oxide">Lithium oxide</a> (<a href="/wiki/Lithium" title="Lithium">Li</a><sub>2</sub>O)</li> <li><a href="/wiki/Mercury(I)_oxide" title="Mercury(I) oxide">Mercury(I) oxide</a> (<a href="/wiki/Mercury_(element)" title="Mercury (element)">Hg</a><sub>2</sub>O)</li> <li><a href="/wiki/Nitrous_oxide" title="Nitrous oxide">Nitrous oxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a><sub>2</sub>O)</li> <li><a href="/wiki/Potassium_oxide" title="Potassium oxide">Potassium oxide</a> (<a href="/wiki/Potassium" title="Potassium">K</a><sub>2</sub>O)</li> <li><a href="/wiki/Rubidium_oxide" title="Rubidium oxide">Rubidium oxide</a> (<a href="/wiki/Rubidium" title="Rubidium">Rb</a><sub>2</sub>O)</li> <li><a href="/wiki/Silver_oxide" title="Silver oxide">Silver oxide</a> (<a href="/wiki/Silver" title="Silver">Ag</a><sub>2</sub>O)</li> <li><a href="/wiki/Thallium(I)_oxide" title="Thallium(I) oxide">Thallium(I) oxide</a> (<a href="/wiki/Thallium" title="Thallium">Tl</a><sub>2</sub>O)</li> <li><a href="/wiki/Sodium_oxide" title="Sodium oxide">Sodium oxide</a> (<a href="/wiki/Sodium" title="Sodium">Na</a><sub>2</sub>O)</li> <li><a href="/wiki/Properties_of_water" title="Properties of water">Water (hydrogen oxide)</a> (<a href="/wiki/Hydrogen" title="Hydrogen">H</a><sub>2</sub>O)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+2 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aluminium(II)_oxide" title="Aluminium(II) oxide">Aluminium(II) oxide</a> (<a href="/wiki/Aluminium" title="Aluminium">Al</a>O)</li> <li><a href="/wiki/Barium_oxide" title="Barium oxide">Barium oxide</a> (<a href="/wiki/Barium" title="Barium">Ba</a>O)</li> <li><a href="/wiki/Berkelium_monoxide" class="mw-redirect" title="Berkelium monoxide">Berkelium monoxide</a> (<a href="/wiki/Berkelium" title="Berkelium">Bk</a>O)</li> <li><a href="/wiki/Beryllium_oxide" title="Beryllium oxide">Beryllium oxide</a> (<a href="/wiki/Beryllium" title="Beryllium">Be</a>O)</li> <li><a href="/wiki/Boron_monoxide" title="Boron monoxide">Boron monoxide</a> (<a href="/wiki/Boron" title="Boron">B</a>O)</li> <li><a href="/wiki/Bromine_monoxide" class="mw-redirect" title="Bromine monoxide">Bromine monoxide</a> (<a href="/wiki/Bromine" title="Bromine">Br</a>O)</li> <li><a href="/wiki/Cadmium_oxide" title="Cadmium oxide">Cadmium oxide</a> (<a href="/wiki/Cadmium" title="Cadmium">Cd</a>O)</li> <li><a href="/wiki/Calcium_oxide" title="Calcium oxide">Calcium oxide</a> (<a href="/wiki/Calcium" title="Calcium">Ca</a>O)</li> <li><a href="/wiki/Carbon_monoxide" title="Carbon monoxide">Carbon monoxide</a> (<a href="/wiki/Carbon" title="Carbon">C</a>O)</li> <li><a href="/wiki/Chlorine_monoxide" title="Chlorine monoxide">Chlorine monoxide</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a>O)</li> <li><a href="/wiki/Chromium(II)_oxide" title="Chromium(II) oxide">Chromium(II) oxide</a> (<a href="/wiki/Chromium" title="Chromium">Cr</a>O)</li> <li><a href="/wiki/Cobalt(II)_oxide" title="Cobalt(II) oxide">Cobalt(II) oxide</a> (<a href="/wiki/Cobalt" title="Cobalt">Co</a>O)</li> <li><a href="/wiki/Copper(II)_oxide" title="Copper(II) oxide">Copper(II) oxide</a> (<a href="/wiki/Copper" title="Copper">Cu</a>O)</li> <li><a href="/wiki/Dinitrogen_dioxide" title="Dinitrogen dioxide">Dinitrogen dioxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a><sub>2</sub>O<sub>2</sub>)</li> <li><a href="/wiki/Europium(II)_oxide" title="Europium(II) oxide">Europium(II) oxide</a> (<a href="/wiki/Europium" title="Europium">Eu</a>O)</li> <li><a href="/wiki/Germanium_monoxide" title="Germanium monoxide">Germanium monoxide</a> (<a href="/wiki/Germanium" title="Germanium">Ge</a>O)</li> <li><a href="/wiki/Iron(II)_oxide" title="Iron(II) oxide">Iron(II) oxide</a> (<a href="/wiki/Iron" title="Iron">Fe</a>O)</li> <li><a href="/wiki/Iodine_monoxide" title="Iodine monoxide">Iodine monoxide</a> (<a href="/wiki/Iodine" title="Iodine">I</a>O)</li> <li><a href="/wiki/Lead(II)_oxide" title="Lead(II) oxide">Lead(II) oxide</a> (<a href="/wiki/Lead" title="Lead">Pb</a>O)</li> <li><a href="/wiki/Magnesium_oxide" title="Magnesium oxide">Magnesium oxide</a> (<a href="/wiki/Magnesium" title="Magnesium">Mg</a>O)</li> <li><a href="/wiki/Manganese(II)_oxide" title="Manganese(II) oxide">Manganese(II) oxide</a> (<a href="/wiki/Manganese" title="Manganese">Mn</a>O)</li> <li><a href="/wiki/Mercury(II)_oxide" title="Mercury(II) oxide">Mercury(II) oxide</a> (<a href="/wiki/Mercury_(element)" title="Mercury (element)">Hg</a>O)</li> <li><a href="/wiki/Nickel(II)_oxide" title="Nickel(II) oxide">Nickel(II) oxide</a> (<a href="/wiki/Nickel" title="Nickel">Ni</a>O)</li> <li><a href="/wiki/Nitric_oxide" title="Nitric oxide">Nitric oxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a>O)</li> <li><a href="/wiki/Niobium_monoxide" title="Niobium monoxide">Niobium monoxide</a> (<a href="/wiki/Niobium" title="Niobium">Nb</a>O)</li> <li><a href="/wiki/Palladium(II)_oxide" title="Palladium(II) oxide">Palladium(II) oxide</a> (<a href="/wiki/Palladium" title="Palladium">Pd</a>O)</li> <li><a href="/wiki/Phosphorus_monoxide" title="Phosphorus monoxide">Phosphorus monoxide</a> (<a href="/wiki/Phosphorus" title="Phosphorus">P</a>O)</li> <li><a href="/wiki/Polonium_monoxide" title="Polonium monoxide">Polonium monoxide</a> (<a href="/wiki/Polonium" title="Polonium">Po</a>O)</li> <li><a href="/wiki/Protactinium_monoxide" title="Protactinium monoxide">Protactinium monoxide</a> (<a href="/wiki/Protactinium" title="Protactinium">Pa</a>O)</li> <li><a href="/wiki/Radium_oxide" title="Radium oxide">Radium oxide</a> (<a href="/wiki/Radium" title="Radium">Ra</a>O)</li> <li><a href="/wiki/Silicon_monoxide" title="Silicon monoxide">Silicon monoxide</a> (<a href="/wiki/Silicon" title="Silicon">Si</a>O)</li> <li><a href="/wiki/Strontium_oxide" title="Strontium oxide">Strontium oxide</a> (<a href="/wiki/Strontium" title="Strontium">Sr</a>O)</li> <li><a href="/wiki/Sulfur_monoxide" title="Sulfur monoxide">Sulfur monoxide</a> (<a href="/wiki/Sulfur" title="Sulfur">S</a>O)</li> <li><a href="/wiki/Disulfur_dioxide" title="Disulfur dioxide">Disulfur dioxide</a> (<a href="/wiki/Sulfur" title="Sulfur">S</a><sub>2</sub>O<sub>2</sub>)</li> <li><a href="/wiki/Thorium_monoxide" title="Thorium monoxide">Thorium monoxide</a> (<a href="/wiki/Thorium" title="Thorium">Th</a>O)</li> <li><a href="/wiki/Tin(II)_oxide" title="Tin(II) oxide">Tin(II) oxide</a> (<a href="/wiki/Tin" title="Tin">Sn</a>O)</li> <li><a href="/wiki/Titanium(II)_oxide" title="Titanium(II) oxide">Titanium(II) oxide</a> (<a href="/wiki/Titanium" title="Titanium">Ti</a>O)</li> <li><a href="/wiki/Vanadium(II)_oxide" title="Vanadium(II) oxide">Vanadium(II) oxide</a> (<a href="/wiki/Vanadium" title="Vanadium">V</a>O)</li> <li><a href="/wiki/Yttrium(II)_oxide" title="Yttrium(II) oxide">Yttrium(II) oxide</a> (<a href="/wiki/Yttrium" title="Yttrium">Y</a>O)</li> <li><a href="/wiki/Zirconium_monoxide" class="mw-redirect" title="Zirconium monoxide">Zirconium monoxide</a> (<a href="/wiki/Zirconium" title="Zirconium">Zr</a>O)</li> <li><a href="/wiki/Zinc_oxide" title="Zinc oxide">Zinc oxide</a> (<a href="/wiki/Zinc" title="Zinc">Zn</a>O)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+3 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Actinium(III)_oxide" title="Actinium(III) oxide">Actinium(III) oxide</a> (<a href="/wiki/Actinium" title="Actinium">Ac</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Aluminium_oxide" title="Aluminium oxide">Aluminium oxide</a> (<a href="/wiki/Aluminium" title="Aluminium">Al</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Americium(III)_oxide" title="Americium(III) oxide">Americium(III) oxide</a> (<a href="/wiki/Americium" title="Americium">Am</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Antimony_trioxide" title="Antimony trioxide">Antimony trioxide</a> (<a href="/wiki/Antimony" title="Antimony">Sb</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Arsenic_trioxide" title="Arsenic trioxide">Arsenic trioxide</a> (<a href="/wiki/Arsenic" title="Arsenic">As</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Berkelium(III)_oxide" title="Berkelium(III) oxide">Berkelium(III) oxide</a> (<a href="/wiki/Berkelium" title="Berkelium">Bk</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Bismuth(III)_oxide" title="Bismuth(III) oxide">Bismuth(III) oxide</a> (<a href="/wiki/Bismuth" title="Bismuth">Bi</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Boron_trioxide" title="Boron trioxide">Boron trioxide</a> (<a href="/wiki/Boron" title="Boron">B</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Caesium_sesquioxide" title="Caesium sesquioxide">Caesium sesquioxide</a> (<a href="/wiki/Caesium" title="Caesium">Cs</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Californium(III)_oxide" title="Californium(III) oxide">Californium(III) oxide</a> (<a href="/wiki/Californium" title="Californium">Cf</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Cerium(III)_oxide" title="Cerium(III) oxide">Cerium(III) oxide</a> (<a href="/wiki/Cerium" title="Cerium">Ce</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Chromium(III)_oxide" title="Chromium(III) oxide">Chromium(III) oxide</a> (<a href="/wiki/Chromium" title="Chromium">Cr</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Cobalt(III)_oxide" title="Cobalt(III) oxide">Cobalt(III) oxide</a> (<a href="/wiki/Cobalt" title="Cobalt">Co</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Dinitrogen_trioxide" title="Dinitrogen trioxide">Dinitrogen trioxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Dysprosium(III)_oxide" title="Dysprosium(III) oxide">Dysprosium(III) oxide</a> (<a href="/wiki/Dysprosium" title="Dysprosium">Dy</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Einsteinium(III)_oxide" title="Einsteinium(III) oxide">Einsteinium(III) oxide</a> (<a href="/wiki/Einsteinium" title="Einsteinium">Es</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Erbium(III)_oxide" title="Erbium(III) oxide">Erbium(III) oxide</a> (<a href="/wiki/Erbium" title="Erbium">Er</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Europium(III)_oxide" title="Europium(III) oxide">Europium(III) oxide</a> (<a href="/wiki/Europium" title="Europium">Eu</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Gadolinium(III)_oxide" title="Gadolinium(III) oxide">Gadolinium(III) oxide</a> (<a href="/wiki/Gadolinium" title="Gadolinium">Gd</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Gallium(III)_oxide" title="Gallium(III) oxide">Gallium(III) oxide</a> (<a href="/wiki/Gallium" title="Gallium">Ga</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Gold(III)_oxide" title="Gold(III) oxide">Gold(III) oxide</a> (<a href="/wiki/Gold" title="Gold">Au</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Holmium(III)_oxide" title="Holmium(III) oxide">Holmium(III) oxide</a> (<a href="/wiki/Holmium" title="Holmium">Ho</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Indium(III)_oxide" title="Indium(III) oxide">Indium(III) oxide</a> (<a href="/wiki/Indium" title="Indium">In</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Iron(III)_oxide" title="Iron(III) oxide">Iron(III) oxide</a> (<a href="/wiki/Iron" title="Iron">Fe</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Lanthanum_oxide" title="Lanthanum oxide">Lanthanum oxide</a> (<a href="/wiki/Lanthanum" title="Lanthanum">La</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Lutetium(III)_oxide" title="Lutetium(III) oxide">Lutetium(III) oxide</a> (<a href="/wiki/Lutetium" title="Lutetium">Lu</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Manganese(III)_oxide" title="Manganese(III) oxide">Manganese(III) oxide</a> (<a href="/wiki/Manganese" title="Manganese">Mn</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Neodymium(III)_oxide" title="Neodymium(III) oxide">Neodymium(III) oxide</a> (<a href="/wiki/Neodymium" title="Neodymium">Nd</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Nickel(III)_oxide" title="Nickel(III) oxide">Nickel(III) oxide</a> (<a href="/wiki/Nickel" title="Nickel">Ni</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Phosphorus_trioxide" title="Phosphorus trioxide">Phosphorus trioxide</a> (<a href="/wiki/Phosphorus" title="Phosphorus">P</a><sub>4</sub>O<sub>6</sub>)</li> <li><a href="/wiki/Praseodymium(III)_oxide" title="Praseodymium(III) oxide">Praseodymium(III) oxide</a> (<a href="/wiki/Praseodymium" title="Praseodymium">Pr</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Promethium(III)_oxide" title="Promethium(III) oxide">Promethium(III) oxide</a> (<a href="/wiki/Promethium" title="Promethium">Pm</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Rhodium(III)_oxide" title="Rhodium(III) oxide">Rhodium(III) oxide</a> (<a href="/wiki/Rhodium" title="Rhodium">Rh</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Samarium(III)_oxide" title="Samarium(III) oxide">Samarium(III) oxide</a> (<a href="/wiki/Samarium" title="Samarium">Sm</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Scandium_oxide" title="Scandium oxide">Scandium oxide</a> (<a href="/wiki/Scandium" title="Scandium">Sc</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Terbium(III)_oxide" title="Terbium(III) oxide">Terbium(III) oxide</a> (<a href="/wiki/Terbium" title="Terbium">Tb</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Thallium(III)_oxide" title="Thallium(III) oxide">Thallium(III) oxide</a> (<a href="/wiki/Thallium" title="Thallium">Tl</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Thulium(III)_oxide" title="Thulium(III) oxide">Thulium(III) oxide</a> (<a href="/wiki/Thulium" title="Thulium">Tm</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Titanium(III)_oxide" title="Titanium(III) oxide">Titanium(III) oxide</a> (<a href="/wiki/Titanium" title="Titanium">Ti</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Tungsten(III)_oxide" title="Tungsten(III) oxide">Tungsten(III) oxide</a> (<a href="/wiki/Tungsten" title="Tungsten">W</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Vanadium(III)_oxide" title="Vanadium(III) oxide">Vanadium(III) oxide</a> (<a href="/wiki/Vanadium" title="Vanadium">V</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Ytterbium(III)_oxide" title="Ytterbium(III) oxide">Ytterbium(III) oxide</a> (<a href="/wiki/Ytterbium" title="Ytterbium">Yb</a><sub>2</sub>O<sub>3</sub>)</li> <li><a href="/wiki/Yttrium(III)_oxide" title="Yttrium(III) oxide">Yttrium(III) oxide</a> (<a href="/wiki/Yttrium" title="Yttrium">Y</a><sub>2</sub>O<sub>3</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+4 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Americium_dioxide" title="Americium dioxide">Americium dioxide</a> (<a href="/wiki/Americium" title="Americium">Am</a>O<sub>2</sub>)</li> <li><a href="/wiki/Berkelium(IV)_oxide" title="Berkelium(IV) oxide">Berkelium(IV) oxide</a> (<a href="/wiki/Berkelium" title="Berkelium">Bk</a>O<sub>2</sub>)</li> <li><a href="/wiki/Bromine_dioxide" title="Bromine dioxide">Bromine dioxide</a> (<a href="/wiki/Bromine" title="Bromine">Br</a>O<sub>2</sub>)</li> <li><a href="/wiki/Californium_dioxide" class="mw-redirect" title="Californium dioxide">Californium dioxide</a> (<a href="/wiki/Californium" title="Californium">Cf</a>O<sub>2</sub>)</li> <li><a href="/wiki/Carbon_dioxide" title="Carbon dioxide">Carbon dioxide</a> (<a href="/wiki/Carbon" title="Carbon">C</a>O<sub>2</sub>)</li> <li><a href="/wiki/Carbon_trioxide" title="Carbon trioxide">Carbon trioxide</a> (<a href="/wiki/Carbon" title="Carbon">C</a>O<sub>3</sub>)</li> <li><a href="/wiki/Cerium(IV)_oxide" title="Cerium(IV) oxide">Cerium(IV) oxide</a> (<a href="/wiki/Cerium" title="Cerium">Ce</a>O<sub>2</sub>)</li> <li><a href="/wiki/Chlorine_dioxide" title="Chlorine dioxide">Chlorine dioxide</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a>O<sub>2</sub>)</li> <li><a href="/wiki/Chromium(IV)_oxide" title="Chromium(IV) oxide">Chromium(IV) oxide</a> (<a href="/wiki/Chromium" title="Chromium">Cr</a>O<sub>2</sub>)</li> <li><a href="/wiki/Curium(IV)_oxide" title="Curium(IV) oxide">Curium(IV) oxide</a> (<a href="/wiki/Curium" title="Curium">Cm</a>O<sub>2</sub>)</li> <li><a href="/wiki/Dinitrogen_tetroxide" title="Dinitrogen tetroxide">Dinitrogen tetroxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a><sub>2</sub>O<sub>4</sub>)</li> <li><a href="/wiki/Germanium_dioxide" title="Germanium dioxide">Germanium dioxide</a> (<a href="/wiki/Germanium" title="Germanium">Ge</a>O<sub>2</sub>)</li> <li><a href="/wiki/Iodine_dioxide" title="Iodine dioxide">Iodine dioxide</a> (<a href="/wiki/Iodine" title="Iodine">I</a>O<sub>2</sub>)</li> <li><a href="/wiki/Iridium_dioxide" class="mw-redirect" title="Iridium dioxide">Iridium dioxide</a> (<a href="/wiki/Iridium" title="Iridium">Ir</a>O<sub>2</sub>)</li> <li><a href="/wiki/Hafnium(IV)_oxide" title="Hafnium(IV) oxide">Hafnium(IV) oxide</a> (<a href="/wiki/Hafnium" title="Hafnium">Hf</a>O<sub>2</sub>)</li> <li><a href="/wiki/Lead_dioxide" title="Lead dioxide">Lead dioxide</a> (<a href="/wiki/Lead" title="Lead">Pb</a>O<sub>2</sub>)</li> <li><a href="/wiki/Manganese_dioxide" title="Manganese dioxide">Manganese dioxide</a> (<a href="/wiki/Manganese" title="Manganese">Mn</a>O<sub>2</sub>)</li> <li><a href="/wiki/Molybdenum_dioxide" title="Molybdenum dioxide">Molybdenum dioxide</a> (<a href="/wiki/Molybdenum" title="Molybdenum">Mo</a>O<sub>2</sub>)</li> <li><a href="/wiki/Neptunium(IV)_oxide" title="Neptunium(IV) oxide">Neptunium(IV) oxide</a> (<a href="/wiki/Neptunium" title="Neptunium">Np</a>O<sub>2</sub>)</li> <li><a href="/wiki/Nitrogen_dioxide" title="Nitrogen dioxide">Nitrogen dioxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a>O<sub>2</sub>)</li> <li><a href="/wiki/Niobium_dioxide" title="Niobium dioxide">Niobium dioxide</a> (<a href="/wiki/Niobium" title="Niobium">Nb</a>O<sub>2</sub>)</li> <li><a href="/wiki/Osmium_dioxide" title="Osmium dioxide">Osmium dioxide</a> (<a href="/wiki/Osmium" title="Osmium">Os</a>O<sub>2</sub>)</li> <li><a href="/wiki/Platinum_dioxide" class="mw-redirect" title="Platinum dioxide">Platinum dioxide</a> (<a href="/wiki/Platinum" title="Platinum">Pt</a>O<sub>2</sub>)</li> <li><a href="/wiki/Plutonium(IV)_oxide" title="Plutonium(IV) oxide">Plutonium(IV) oxide</a> (<a href="/wiki/Plutonium" title="Plutonium">Pu</a>O<sub>2</sub>)</li> <li><a href="/wiki/Polonium_dioxide" title="Polonium dioxide">Polonium dioxide</a> (<a href="/wiki/Polonium" title="Polonium">Po</a>O<sub>2</sub>)</li> <li><a href="/wiki/Praseodymium(IV)_oxide" title="Praseodymium(IV) oxide">Praseodymium(IV) oxide</a> (<a href="/wiki/Praseodymium" title="Praseodymium">Pr</a>O<sub>2</sub>)</li> <li><a href="/wiki/Protactinium(IV)_oxide" title="Protactinium(IV) oxide">Protactinium(IV) oxide</a> (<a href="/wiki/Protactinium" title="Protactinium">Pa</a>O<sub>2</sub>)</li> <li><a href="/wiki/Rhenium(IV)_oxide" title="Rhenium(IV) oxide">Rhenium(IV) oxide</a> (<a href="/wiki/Rhenium" title="Rhenium">Re</a>O<sub>2</sub>)</li> <li><a href="/wiki/Rhodium(IV)_oxide" title="Rhodium(IV) oxide">Rhodium(IV) oxide</a> (<a href="/wiki/Rhodium" title="Rhodium">Rh</a>O<sub>2</sub>)</li> <li><a href="/wiki/Ruthenium(IV)_oxide" title="Ruthenium(IV) oxide">Ruthenium(IV) oxide</a> (<a href="/wiki/Ruthenium" title="Ruthenium">Ru</a>O<sub>2</sub>)</li> <li><a href="/wiki/Selenium_dioxide" title="Selenium dioxide">Selenium dioxide</a> (<a href="/wiki/Selenium" title="Selenium">Se</a>O<sub>2</sub>)</li> <li><a href="/wiki/Silicon_dioxide" title="Silicon dioxide">Silicon dioxide</a> (<a href="/wiki/Silicon" title="Silicon">Si</a>O<sub>2</sub>)</li> <li><a href="/wiki/Sulfur_dioxide" title="Sulfur dioxide">Sulfur dioxide</a> (<a href="/wiki/Sulfur" title="Sulfur">S</a>O<sub>2</sub>)</li> <li><a href="/wiki/Technetium(IV)_oxide" title="Technetium(IV) oxide">Technetium(IV) oxide</a> (<a href="/wiki/Technetium" title="Technetium">Tc</a>O<sub>2</sub>)</li> <li><a href="/wiki/Tellurium_dioxide" title="Tellurium dioxide">Tellurium dioxide</a> (<a href="/wiki/Tellurium" title="Tellurium">Te</a>O<sub>2</sub>)</li> <li><a href="/wiki/Terbium(IV)_oxide" title="Terbium(IV) oxide">Terbium(IV) oxide</a> (<a href="/wiki/Terbium" title="Terbium">Tb</a>O<sub>2</sub>)</li> <li><a href="/wiki/Thorium_dioxide" title="Thorium dioxide">Thorium dioxide</a> (<a href="/wiki/Thorium" title="Thorium">Th</a>O<sub>2</sub>)</li> <li><a href="/wiki/Tin(IV)_oxide" title="Tin(IV) oxide">Tin dioxide</a> (<a href="/wiki/Tin" title="Tin">Sn</a>O<sub>2</sub>)</li> <li><a href="/wiki/Titanium_dioxide" title="Titanium dioxide">Titanium dioxide</a> (<a href="/wiki/Titanium" title="Titanium">Ti</a>O<sub>2</sub>)</li> <li><a href="/wiki/Tungsten(IV)_oxide" title="Tungsten(IV) oxide">Tungsten(IV) oxide</a> (<a href="/wiki/Tungsten" title="Tungsten">W</a>O<sub>2</sub>)</li> <li><a href="/wiki/Uranium_dioxide" title="Uranium dioxide">Uranium dioxide</a> (<a href="/wiki/Uranium" title="Uranium">U</a>O<sub>2</sub>)</li> <li><a href="/wiki/Vanadium(IV)_oxide" title="Vanadium(IV) oxide">Vanadium(IV) oxide</a> (<a href="/wiki/Vanadium" title="Vanadium">V</a>O<sub>2</sub>)</li> <li><a href="/wiki/Zirconium_dioxide" title="Zirconium dioxide">Zirconium dioxide</a> (<a href="/wiki/Zirconium" title="Zirconium">Zr</a>O<sub>2</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+5 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Antimony_pentoxide" title="Antimony pentoxide">Antimony pentoxide</a> (<a href="/wiki/Antimony" title="Antimony">Sb</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Arsenic_pentoxide" title="Arsenic pentoxide">Arsenic pentoxide</a> (<a href="/wiki/Arsenic" title="Arsenic">As</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Bismuth_pentoxide" title="Bismuth pentoxide">Bismuth pentoxide</a> (<a href="/wiki/Bismuth" title="Bismuth">Bi</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Dinitrogen_pentoxide" title="Dinitrogen pentoxide">Dinitrogen pentoxide</a> (<a href="/wiki/Nitrogen" title="Nitrogen">N</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Niobium_pentoxide" title="Niobium pentoxide">Niobium pentoxide</a> (<a href="/wiki/Niobium" title="Niobium">Nb</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Phosphorus_pentoxide" title="Phosphorus pentoxide">Phosphorus pentoxide</a> (<a href="/wiki/Phosphorus" title="Phosphorus">P</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Protactinium(V)_oxide" title="Protactinium(V) oxide">Protactinium(V) oxide</a> (<a href="/wiki/Protactinium" title="Protactinium">Pa</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Tantalum_pentoxide" title="Tantalum pentoxide">Tantalum pentoxide</a> (<a href="/wiki/Tantalum" title="Tantalum">Ta</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Tungsten_pentoxide" title="Tungsten pentoxide">Tungsten pentoxide</a> (<a href="/wiki/Tungsten" title="Tungsten">W</a><sub>2</sub>O<sub>5</sub>)</li> <li><a href="/wiki/Vanadium(V)_oxide" title="Vanadium(V) oxide">Vanadium(V) oxide</a> (<a href="/wiki/Vanadium" title="Vanadium">V</a><sub>2</sub>O<sub>5</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+6 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chromium_trioxide" title="Chromium trioxide">Chromium trioxide</a> (<a href="/wiki/Chromium" title="Chromium">Cr</a>O<sub>3</sub>)</li> <li><a href="/wiki/Molybdenum_trioxide" title="Molybdenum trioxide">Molybdenum trioxide</a> (<a href="/wiki/Molybdenum" title="Molybdenum">Mo</a>O<sub>3</sub>)</li> <li><a href="/wiki/Polonium_trioxide" title="Polonium trioxide">Polonium trioxide</a> (<a href="/wiki/Polonium" title="Polonium">Po</a>O<sub>3</sub>)</li> <li><a href="/wiki/Rhenium_trioxide" title="Rhenium trioxide">Rhenium trioxide</a> (<a href="/wiki/Rhenium" title="Rhenium">Re</a>O<sub>3</sub>)</li> <li><a href="/wiki/Selenium_trioxide" title="Selenium trioxide">Selenium trioxide</a> (<a href="/wiki/Selenium" title="Selenium">Se</a>O<sub>3</sub>)</li> <li><a href="/wiki/Sulfur_trioxide" title="Sulfur trioxide">Sulfur trioxide</a> (<a href="/wiki/Sulfur" title="Sulfur">S</a>O<sub>3</sub>)</li> <li><a href="/wiki/Tellurium_trioxide" title="Tellurium trioxide">Tellurium trioxide</a> (<a href="/wiki/Tellurium" title="Tellurium">Te</a>O<sub>3</sub>)</li> <li><a href="/wiki/Tungsten_trioxide" title="Tungsten trioxide">Tungsten trioxide</a> (<a href="/wiki/Tungsten" title="Tungsten">W</a>O<sub>3</sub>)</li> <li><a class="mw-selflink selflink">Uranium trioxide</a> (<a href="/wiki/Uranium" title="Uranium">U</a>O<sub>3</sub>)</li> <li><a href="/wiki/Xenon_trioxide" title="Xenon trioxide">Xenon trioxide</a> (<a href="/wiki/Xenon" title="Xenon">Xe</a>O<sub>3</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+7 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dichlorine_heptoxide" title="Dichlorine heptoxide">Dichlorine heptoxide</a> (<a href="/wiki/Chlorine" title="Chlorine">Cl</a><sub>2</sub>O<sub>7</sub>)</li> <li><a href="/wiki/Manganese_heptoxide" title="Manganese heptoxide">Manganese heptoxide</a> (<a href="/wiki/Manganese" title="Manganese">Mn</a><sub>2</sub>O<sub>7</sub>)</li> <li><a href="/wiki/Rhenium(VII)_oxide" title="Rhenium(VII) oxide">Rhenium(VII) oxide</a> (<a href="/wiki/Rhenium" title="Rhenium">Re</a><sub>2</sub>O<sub>7</sub>)</li> <li><a href="/wiki/Technetium(VII)_oxide" title="Technetium(VII) oxide">Technetium(VII) oxide</a> (<a href="/wiki/Technetium" title="Technetium">Tc</a><sub>2</sub>O<sub>7</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">+8 oxidation state</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Iridium_tetroxide" title="Iridium tetroxide">Iridium tetroxide</a> (<a href="/wiki/Iridium" title="Iridium">Ir</a>O<sub>4</sub>)</li> <li><a href="/wiki/Osmium_tetroxide" title="Osmium tetroxide">Osmium tetroxide</a> (<a href="/wiki/Osmium" title="Osmium">Os</a>O<sub>4</sub>)</li> <li><a href="/wiki/Ruthenium_tetroxide" title="Ruthenium tetroxide">Ruthenium tetroxide</a> (<a href="/wiki/Ruthenium" title="Ruthenium">Ru</a>O<sub>4</sub>)</li> <li><a href="/wiki/Xenon_tetroxide" title="Xenon tetroxide">Xenon tetroxide</a> (<a href="/wiki/Xenon" title="Xenon">Xe</a>O<sub>4</sub>)</li> <li><a href="/wiki/Hassium_tetroxide" title="Hassium tetroxide">Hassium tetroxide</a> (<a href="/wiki/Hassium" title="Hassium">Hs</a>O<sub>4</sub>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Oxocarbon" title="Oxocarbon">Oxocarbon</a></li> <li><a href="/wiki/Suboxide" title="Suboxide">Suboxide</a></li> <li><a href="/wiki/Oxyanion" title="Oxyanion">Oxyanion</a></li> <li><a href="/wiki/Ozonide" title="Ozonide">Ozonide</a></li> <li><a href="/wiki/Peroxide" title="Peroxide">Peroxide</a></li> <li><a href="/wiki/Superoxide" title="Superoxide">Superoxide</a></li> <li><a href="/wiki/Oxypnictide" title="Oxypnictide">Oxypnictide</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>Oxides are sorted by <a href="/wiki/Oxidation_state" title="Oxidation state">oxidation state</a>. <a href="/wiki/Category:Oxides" title="Category:Oxides">Category:Oxides</a></div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div 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