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id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Início</div> </a> </li> <li id="toc-Obtenção" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Obtenção"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Obtenção</span> </div> </a> <ul id="toc-Obtenção-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Propriedades" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Propriedades"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Propriedades</span> </div> </a> <ul id="toc-Propriedades-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referências" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referências"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Referências</span> </div> </a> <ul id="toc-Referências-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Ligações_externas" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Ligações_externas"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Ligações externas</span> </div> </a> <ul id="toc-Ligações_externas-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="Conteúdo" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Alternar o índice" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Alternar o índice</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Óxido de alumínio</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ir para um artigo noutra língua. Disponível em 67 línguas" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-67" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">67 línguas</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Aluminiumoksied" title="Aluminiumoksied — africanês" lang="af" hreflang="af" data-title="Aluminiumoksied" data-language-autonym="Afrikaans" data-language-local-name="africanês" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A3%D9%83%D8%B3%D9%8A%D8%AF_%D8%A7%D9%84%D8%A3%D9%84%D9%88%D9%85%D9%86%D9%8A%D9%88%D9%85" title="أكسيد الألومنيوم — árabe" lang="ar" hreflang="ar" data-title="أكسيد الألومنيوم" data-language-autonym="العربية" data-language-local-name="árabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Al%C3%BAmina" title="Alúmina — asturiano" lang="ast" hreflang="ast" data-title="Alúmina" data-language-autonym="Asturianu" data-language-local-name="asturiano" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Al%C3%BCminium_oksid" title="Alüminium oksid — azerbaijano" lang="az" hreflang="az" data-title="Alüminium oksid" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaijano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%A2%D9%84%D9%88%D9%85%DB%8C%D9%86%DB%8C%D9%88%D9%85_%D8%A7%D9%88%DA%A9%D8%B3%DB%8C%D8%AF" title="آلومینیوم اوکسید — South Azerbaijani" lang="azb" hreflang="azb" data-title="آلومینیوم اوکسید" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%90%D0%BB%D1%83%D0%BC%D0%B8%D0%BD%D0%B8%D0%B5%D0%B2_%D0%BE%D0%BA%D1%81%D0%B8%D0%B4" title="Алуминиев оксид — búlgaro" lang="bg" hreflang="bg" data-title="Алуминиев оксид" data-language-autonym="Български" data-language-local-name="búlgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%85%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%B2%E0%A7%81%E0%A6%AE%E0%A6%BF%E0%A6%A8%E0%A6%BF%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%AE_%E0%A6%85%E0%A6%95%E0%A7%8D%E0%A6%B8%E0%A6%BE%E0%A6%87%E0%A6%A1" title="অ্যালুমিনিয়াম অক্সাইড — bengalês" lang="bn" hreflang="bn" data-title="অ্যালুমিনিয়াম অক্সাইড" data-language-autonym="বাংলা" data-language-local-name="bengalês" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Aluminij-oksid" title="Aluminij-oksid — bósnio" lang="bs" hreflang="bs" data-title="Aluminij-oksid" data-language-autonym="Bosanski" data-language-local-name="bósnio" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/%C3%92xid_d%27alumini" title="Òxid d'alumini — catalão" lang="ca" hreflang="ca" data-title="Òxid d'alumini" data-language-autonym="Català" data-language-local-name="catalão" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Oxid_hlinit%C3%BD" title="Oxid hlinitý — checo" lang="cs" hreflang="cs" data-title="Oxid hlinitý" data-language-autonym="Čeština" data-language-local-name="checo" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%90%D0%BB%D1%8E%D0%BC%D0%B8%D0%BD%D0%B8%D0%B9_%D0%BE%D0%BA%D1%81%D0%B8%D1%87%C4%95" title="Алюминий оксичĕ — chuvash" lang="cv" hreflang="cv" data-title="Алюминий оксичĕ" data-language-autonym="Чӑвашла" data-language-local-name="chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Aluminiumoxid" title="Aluminiumoxid — dinamarquês" lang="da" hreflang="da" data-title="Aluminiumoxid" data-language-autonym="Dansk" data-language-local-name="dinamarquês" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Aluminiumoxid" title="Aluminiumoxid — alemão" lang="de" hreflang="de" data-title="Aluminiumoxid" data-language-autonym="Deutsch" data-language-local-name="alemão" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9F%CE%BE%CE%B5%CE%AF%CE%B4%CE%B9%CE%BF_%CF%84%CE%BF%CF%85_%CE%B1%CF%81%CE%B3%CE%B9%CE%BB%CE%AF%CE%BF%CF%85" title="Οξείδιο του αργιλίου — grego" lang="el" hreflang="el" data-title="Οξείδιο του αργιλίου" data-language-autonym="Ελληνικά" data-language-local-name="grego" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Aluminium_oxide" title="Aluminium oxide — inglês" lang="en" hreflang="en" data-title="Aluminium oxide" data-language-autonym="English" data-language-local-name="inglês" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Aluminia_oksido" title="Aluminia oksido — esperanto" lang="eo" hreflang="eo" data-title="Aluminia oksido" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Al%C3%BAmina" title="Alúmina — espanhol" lang="es" hreflang="es" data-title="Alúmina" data-language-autonym="Español" data-language-local-name="espanhol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Alumiiniumoksiid" title="Alumiiniumoksiid — estónio" lang="et" hreflang="et" data-title="Alumiiniumoksiid" data-language-autonym="Eesti" data-language-local-name="estónio" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Alumina" title="Alumina — basco" lang="eu" hreflang="eu" data-title="Alumina" data-language-autonym="Euskara" data-language-local-name="basco" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A2%D9%84%D9%88%D9%85%DB%8C%D9%86%DB%8C%D9%88%D9%85_%D8%A7%DA%A9%D8%B3%DB%8C%D8%AF" title="آلومینیوم اکسید — persa" lang="fa" hreflang="fa" data-title="آلومینیوم اکسید" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi badge-Q17559452 badge-recommendedarticle mw-list-item" title="artigo recomendado"><a href="https://fi.wikipedia.org/wiki/Alumiinioksidi" title="Alumiinioksidi — finlandês" lang="fi" hreflang="fi" data-title="Alumiinioksidi" data-language-autonym="Suomi" data-language-local-name="finlandês" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Alumine" title="Alumine — francês" lang="fr" hreflang="fr" data-title="Alumine" data-language-autonym="Français" data-language-local-name="francês" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Ocsa%C3%ADd_al%C3%BAmanaim" title="Ocsaíd alúmanaim — irlandês" lang="ga" hreflang="ga" data-title="Ocsaíd alúmanaim" data-language-autonym="Gaeilge" data-language-local-name="irlandês" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/%C3%93xido_de_aluminio" title="Óxido de aluminio — galego" lang="gl" hreflang="gl" data-title="Óxido de aluminio" data-language-autonym="Galego" data-language-local-name="galego" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gv mw-list-item"><a href="https://gv.wikipedia.org/wiki/Ocseed_ollymin" title="Ocseed ollymin — manx" lang="gv" hreflang="gv" data-title="Ocseed ollymin" data-language-autonym="Gaelg" data-language-local-name="manx" class="interlanguage-link-target"><span>Gaelg</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/Y%C3%B2ng-fa-l%C3%AE" title="Yòng-fa-lî — hacá" lang="hak" hreflang="hak" data-title="Yòng-fa-lî" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="hacá" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%90%D7%9C%D7%95%D7%9E%D7%99%D7%A0%D7%94" title="אלומינה — hebraico" lang="he" hreflang="he" data-title="אלומינה" data-language-autonym="עברית" data-language-local-name="hebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%8F%E0%A4%B2%E0%A5%8D%E0%A4%AF%E0%A5%81%E0%A4%AE%E0%A4%BF%E0%A4%A8%E0%A4%BF%E0%A4%AF%E0%A4%AE_%E0%A4%86%E0%A4%95%E0%A5%8D%E0%A4%B8%E0%A4%BE%E0%A4%87%E0%A4%A1" title="एल्युमिनियम आक्साइड — hindi" lang="hi" hreflang="hi" data-title="एल्युमिनियम आक्साइड" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Aluminijev_oksid" title="Aluminijev oksid — croata" lang="hr" hreflang="hr" data-title="Aluminijev oksid" data-language-autonym="Hrvatski" data-language-local-name="croata" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Alum%C3%ADnium-oxid" title="Alumínium-oxid — húngaro" lang="hu" hreflang="hu" data-title="Alumínium-oxid" data-language-autonym="Magyar" data-language-local-name="húngaro" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D5%AC%D5%B5%D5%B8%D6%82%D5%B4%D5%AB%D5%B6%D5%AB_%D6%85%D6%84%D5%BD%D5%AB%D5%A4" title="Ալյումինի օքսիդ — arménio" lang="hy" hreflang="hy" data-title="Ալյումինի օքսիդ" data-language-autonym="Հայերեն" data-language-local-name="arménio" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Aluminium_oksida" title="Aluminium oksida — indonésio" lang="id" hreflang="id" data-title="Aluminium oksida" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonésio" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Alumino" title="Alumino — ido" lang="io" hreflang="io" data-title="Alumino" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/%C3%81lox%C3%AD%C3%B0" title="Áloxíð — islandês" lang="is" hreflang="is" data-title="Áloxíð" data-language-autonym="Íslenska" data-language-local-name="islandês" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Ossido_di_alluminio" title="Ossido di alluminio — italiano" lang="it" hreflang="it" data-title="Ossido di alluminio" data-language-autonym="Italiano" data-language-local-name="italiano" class="interlanguage-link-target"><span>Italiano</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%A2%E3%83%AB%E3%83%9F%E3%83%8B%E3%82%A6%E3%83%A0" title="酸化アルミニウム — japonês" lang="ja" hreflang="ja" data-title="酸化アルミニウム" data-language-autonym="日本語" data-language-local-name="japonês" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%90%D0%BB%D1%8E%D0%BC%D0%B8%D0%BD%D0%B8%D0%B9_%D0%BE%D0%BA%D1%81%D0%B8%D0%B4%D1%96" title="Алюминий оксиді — cazaque" lang="kk" hreflang="kk" data-title="Алюминий оксиді" data-language-autonym="Қазақша" data-language-local-name="cazaque" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%82%B0%ED%99%94_%EC%95%8C%EB%A3%A8%EB%AF%B8%EB%8A%84" title="산화 알루미늄 — coreano" lang="ko" hreflang="ko" data-title="산화 알루미늄" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Baf%C3%BBnoks%C3%AEd" title="Bafûnoksîd — curdo" lang="ku" hreflang="ku" data-title="Bafûnoksîd" data-language-autonym="Kurdî" data-language-local-name="curdo" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%90%D0%BB%D1%8E%D0%BC%D0%B8%D0%BD%D0%B8%D0%B9_%D0%BE%D0%BA%D1%81%D0%B8%D0%B4%D0%B8" title="Алюминий оксиди — quirguiz" lang="ky" hreflang="ky" data-title="Алюминий оксиди" data-language-autonym="Кыргызча" data-language-local-name="quirguiz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Alum%C4%ABnija_oks%C4%ABds" title="Alumīnija oksīds — letão" lang="lv" hreflang="lv" data-title="Alumīnija oksīds" data-language-autonym="Latviešu" data-language-local-name="letão" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%90%D0%BB%D1%83%D0%BC%D0%B8%D0%BD%D0%B8%D1%83%D0%BC_%D0%BE%D0%BA%D1%81%D0%B8%D0%B4" title="Алуминиум оксид — macedónio" lang="mk" hreflang="mk" data-title="Алуминиум оксид" data-language-autonym="Македонски" data-language-local-name="macedónio" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%85%E0%B4%B2%E0%B5%82%E0%B4%AE%E0%B4%BF%E0%B4%A8%E0%B4%BF%E0%B4%AF%E0%B4%82_%E0%B4%93%E0%B4%95%E0%B5%8D%E0%B4%B8%E0%B5%88%E0%B4%A1%E0%B5%8D" title="അലൂമിനിയം ഓക്സൈഡ് — malaiala" lang="ml" hreflang="ml" data-title="അലൂമിനിയം ഓക്സൈഡ്" data-language-autonym="മലയാളം" data-language-local-name="malaiala" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Aluminium_oksida" title="Aluminium oksida — malaio" lang="ms" hreflang="ms" data-title="Aluminium oksida" data-language-autonym="Bahasa Melayu" data-language-local-name="malaio" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Aluminiumoxide" title="Aluminiumoxide — neerlandês" lang="nl" hreflang="nl" data-title="Aluminiumoxide" data-language-autonym="Nederlands" data-language-local-name="neerlandês" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Aluminiumoksid" title="Aluminiumoksid — norueguês nynorsk" lang="nn" hreflang="nn" data-title="Aluminiumoksid" data-language-autonym="Norsk nynorsk" data-language-local-name="norueguês nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Aluminiumoksid" title="Aluminiumoksid — norueguês bokmål" lang="nb" hreflang="nb" data-title="Aluminiumoksid" data-language-autonym="Norsk bokmål" data-language-local-name="norueguês bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Tritlenek_diglinu" title="Tritlenek diglinu — polaco" lang="pl" hreflang="pl" data-title="Tritlenek diglinu" data-language-autonym="Polski" data-language-local-name="polaco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Oxid_de_aluminiu" title="Oxid de aluminiu — romeno" lang="ro" hreflang="ro" data-title="Oxid de aluminiu" data-language-autonym="Română" data-language-local-name="romeno" 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_%D0%B0%D0%BB%D1%8E%D0%BC%D0%B8%D0%BD%D0%B8%D1%8F" title="Оксид алюминия — russo" lang="ru" hreflang="ru" data-title="Оксид алюминия" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Aluminijum_oksid" title="Aluminijum oksid — servo-croata" lang="sh" hreflang="sh" data-title="Aluminijum oksid" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="servo-croata" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Aluminium_oxide" title="Aluminium oxide — Simple English" lang="en-simple" hreflang="en-simple" data-title="Aluminium oxide" 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-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Oxid_hlinit%C3%BD" title="Oxid hlinitý — eslovaco" lang="sk" hreflang="sk" data-title="Oxid hlinitý" data-language-autonym="Slovenčina" data-language-local-name="eslovaco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Aluminijev_oksid" title="Aluminijev oksid — esloveno" lang="sl" hreflang="sl" data-title="Aluminijev oksid" data-language-autonym="Slovenščina" data-language-local-name="esloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%90%D0%BB%D1%83%D0%BC%D0%B8%D0%BD%D0%B8%D1%98%D1%83%D0%BC_%D0%BE%D0%BA%D1%81%D0%B8%D0%B4" title="Алуминијум оксид — sérvio" lang="sr" hreflang="sr" data-title="Алуминијум оксид" data-language-autonym="Српски / srpski" data-language-local-name="sérvio" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Aluminiumoxid" title="Aluminiumoxid — sueco" lang="sv" hreflang="sv" data-title="Aluminiumoxid" data-language-autonym="Svenska" data-language-local-name="sueco" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%85%E0%B0%B2%E0%B1%8D%E0%B0%AF%E0%B1%82%E0%B0%AE%E0%B0%BF%E0%B0%A8%E0%B0%BF%E0%B0%AF%E0%B0%82_%E0%B0%86%E0%B0%95%E0%B1%8D%E0%B0%B8%E0%B1%88%E0%B0%A1%E0%B1%8D" title="అల్యూమినియం ఆక్సైడ్ — telugu" lang="te" hreflang="te" data-title="అల్యూమినియం ఆక్సైడ్" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B0%E0%B8%A5%E0%B8%B9%E0%B8%A1%E0%B8%B4%E0%B9%80%E0%B8%99%E0%B8%B5%E0%B8%A2%E0%B8%A1%E0%B8%AD%E0%B8%AD%E0%B8%81%E0%B9%84%E0%B8%8B%E0%B8%94%E0%B9%8C" title="อะลูมิเนียมออกไซด์ — tailandês" lang="th" hreflang="th" data-title="อะลูมิเนียมออกไซด์" data-language-autonym="ไทย" data-language-local-name="tailandês" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Al%C3%BCminyum_oksit" title="Alüminyum oksit — turco" lang="tr" hreflang="tr" data-title="Alüminyum oksit" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9E%D0%BA%D1%81%D0%B8%D0%B4_%D0%B0%D0%BB%D1%8E%D0%BC%D1%96%D0%BD%D1%96%D1%8E" title="Оксид алюмінію — ucraniano" lang="uk" hreflang="uk" data-title="Оксид алюмінію" data-language-autonym="Українська" data-language-local-name="ucraniano" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%A7%DB%8C%D9%84%D9%88%D9%85%DB%8C%D9%86%D8%A7" title="ایلومینا — urdu" lang="ur" hreflang="ur" data-title="ایلومینا" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Aluminiy_oksidi" title="Aluminiy oksidi — usbeque" lang="uz" hreflang="uz" data-title="Aluminiy oksidi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="usbeque" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Nh%C3%B4m_oxide" title="Nhôm oxide — vietnamita" lang="vi" hreflang="vi" data-title="Nhôm oxide" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E6%B0%A7%E5%8C%96%E9%93%9D" title="氧化铝 — wu" lang="wuu" hreflang="wuu" data-title="氧化铝" data-language-autonym="吴语" data-language-local-name="wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%B0%A7%E5%8C%96%E9%93%9D" title="氧化铝 — chinês" lang="zh" hreflang="zh" data-title="氧化铝" data-language-autonym="中文" data-language-local-name="chinês" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Sng-h%C3%B2a_a-l%C3%BA-mih" title="Sng-hòa a-lú-mih — min nan" lang="nan" 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</div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Aluminium_oxide" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q177342" title="Hiperligação para o elemento do repositório de dados [g]" accesskey="g"><span>Elemento Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Ferramentas de página"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aspeto"> <div id="vector-appearance-pinned-container" 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class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Origem: Wikipédia, a enciclopédia livre.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom"><span style="color:#655900;font-weight:bold;">(Redirecionado de <u><a href="/w/index.php?title=Alumina&redirect=no" class="mw-redirect" title="Alumina">Alumina</a></u>)</span></span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="pt" dir="ltr"><table class="toccolours" style="width: 300px; float: right; clear: right; margin: 0 0 1em 1em; border-collapse: collapse;"> <tbody><tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Óxido de Alumínio<br /><small><a href="/wiki/Wikip%C3%A9dia:Aviso_m%C3%A9dico" title="Wikipédia:Aviso médico">Alerta sobre risco à saúde</a></small> </th></tr> <tr> <td align="center" colspan="2" bgcolor="#ffffff"><span typeof="mw:File"><a href="/wiki/Ficheiro:Corundum-3D-balls.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Corundum-3D-balls.png/250px-Corundum-3D-balls.png" decoding="async" width="250" height="143" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Corundum-3D-balls.png/375px-Corundum-3D-balls.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Corundum-3D-balls.png/500px-Corundum-3D-balls.png 2x" data-file-width="1100" data-file-height="629" /></a></span> </td></tr> <tr> <td align="center" colspan="2" bgcolor="#ffffff"><span typeof="mw:File"><a href="/wiki/Ficheiro:Aluminium_oxide2.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Aluminium_oxide2.png/250px-Aluminium_oxide2.png" decoding="async" width="250" height="237" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/27/Aluminium_oxide2.png/375px-Aluminium_oxide2.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/27/Aluminium_oxide2.png/500px-Aluminium_oxide2.png 2x" data-file-width="1137" data-file-height="1080" /></a></span> </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Identificadores </th></tr> <tr> <td bgcolor=""><a href="/wiki/Registro_CAS" class="mw-redirect" title="Registro CAS">Número CAS</a> </td> <td bgcolor=""><span class="reflink plainlinksneverexpand"><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=1344-28-1">1344-28-1</a></span> </td></tr> <tr> <td><a href="/wiki/ChemSpider" title="ChemSpider">ChemSpider</a> </td> <td><span class="reflink plainlinksneverexpand"><a rel="nofollow" class="external text" href="http://www.chemspider.com/Chemical-Structure.14086">14086</a></span> </td></tr> <tr> <td><a href="/wiki/N%C3%BAmero_RTECS" title="Número RTECS">Número RTECS</a> </td> <td>BD120000 </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Propriedades </th></tr> <tr> <td><a href="/wiki/F%C3%B3rmula_qu%C3%ADmica" title="Fórmula química">Fórmula molecular</a> </td> <td>Al<sub>2</sub>O<sub>3</sub> </td></tr> <tr> <td><a href="/wiki/Massa_molar" title="Massa molar">Massa molar</a> </td> <td>101.96 g/mol </td></tr> <tr> <td><a href="/wiki/Densidade" title="Densidade">Densidade</a> </td> <td>3,94 g·cm<sup>-3</sup><sup id="cite_ref-Merck_1-0" class="reference"><a href="#cite_note-Merck-1"><span>[</span>1<span>]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Ponto_de_fus%C3%A3o" title="Ponto de fusão">Ponto de fusão</a> </td> <td> <p>2072 °C<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span>[</span>2<span>]</span></a></sup><br />2050 °C<sup id="cite_ref-Merck_1-1" class="reference"><a href="#cite_note-Merck-1"><span>[</span>1<span>]</span></a></sup> </p> </td></tr> <tr> <td><a href="/wiki/Ponto_de_ebuli%C3%A7%C3%A3o" title="Ponto de ebulição">Ponto de ebulição</a> </td> <td> <p>2980 °C<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span>[</span>3<span>]</span></a></sup><br />2980 ± 60 °C<sup id="cite_ref-Merck_1-2" class="reference"><a href="#cite_note-Merck-1"><span>[</span>1<span>]</span></a></sup> </p> </td></tr> <tr> <td><a href="/wiki/Solubilidade" title="Solubilidade">Solubilidade</a> em <a href="/wiki/%C3%81gua" title="Água">água</a> </td> <td>insolúvel<sup id="cite_ref-Merck_1-3" class="reference"><a href="#cite_note-Merck-1"><span>[</span>1<span>]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Refra%C3%A7%C3%A3o" title="Refração">Índice de refracção</a> (<i>n</i><sub>D</sub>) </td> <td>n<sub>ω</sub>=1.768 - 1.772 n<sub>ε</sub>=1.760 - 1.763<br /> <a href="/w/index.php?title=Birefringence&action=edit&redlink=1" class="new" title="Birefringence (página não existe)">Birefringence</a> 0.008 <span style="color:gray"><sup>[</sup></span><sup><a href="/wiki/Wikip%C3%A9dia:Livro_de_estilo/Cite_as_fontes" title="Wikipédia:Livro de estilo/Cite as fontes"><span title="Esta afirmação precisa de uma referência para confirmá-la desde janeiro de 2012." style="color:gray"><i>carece de fontes</i></span></a><span class="printfooter">?</span><span style="color:gray">]</span></sup> </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Estrutura </th></tr> <tr> <td><a href="/wiki/Geometria_de_coordena%C3%A7%C3%A3o" title="Geometria de coordenação">Geometria de<br />coordenação</a> </td> <td><a href="/w/index.php?title=Octahedral&action=edit&redlink=1" class="new" title="Octahedral (página não existe)">octahedral</a> </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Termoquímica </th></tr> <tr> <td><a href="/wiki/Entalpia_de_forma%C3%A7%C3%A3o" class="mw-redirect" title="Entalpia de formação">Entalpia padrão<br />de formação</a> Δ<sub>f</sub><i>H</i><sup><s>o</s></sup><sub>298</sub> </td> <td>−1675.7 kJ·mol<sup>−1</sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span>[</span>4<span>]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Entropia_molar_padr%C3%A3o" title="Entropia molar padrão">Entropia molar<br />padrão</a> <i>S</i><sup><s>o</s></sup><sub>298</sub> </td> <td>50.92 J·mol<sup>−1</sup>·K<sup>−1</sup> <span style="color:gray"><sup>[</sup></span><sup><a href="/wiki/Wikip%C3%A9dia:Livro_de_estilo/Cite_as_fontes" title="Wikipédia:Livro de estilo/Cite as fontes"><span title="Esta afirmação precisa de uma referência para confirmá-la desde janeiro de 2012." style="color:gray"><i>carece de fontes</i></span></a><span class="printfooter">?</span><span style="color:gray">]</span></sup> </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Riscos associados </th></tr> <tr> <td><a href="/wiki/Diretiva_67/548/EEC" class="mw-redirect" title="Diretiva 67/548/EEC">Classificação UE</a> </td> <td>Not listed. </td></tr> <tr> <td><a href="/wiki/NFPA_704" class="mw-redirect" title="NFPA 704">NFPA 704</a> </td> <td> <div style="position: relative; height: 85px; width: 75px;"> <div style="position: absolute; height: 75px; width: 75px;"><span typeof="mw:File"><a href="/wiki/Ficheiro:NFPA_704.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/75px-NFPA_704.svg.png" decoding="async" width="75" height="75" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/113px-NFPA_704.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/150px-NFPA_704.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></div> <div title="Inflamabilidade" style="background:transparent; width:75px; height:2em; text-align:center; vertical-align:middle; position:absolute; top:8px; font-size:large;"><span class="abbr" style="color: black;" title="Inflamabilidade 0. Não irá queimar (p.ex. água).">0</span></div> <div title="Health" style="background: transparent; width: 37.5px; height: 2em; text-align: center; vertical-align: middle; position: absolute; top: 26px; font-size: large;"><span class="abbr" style="color: black;" title="Risco à saúde 2. Exposição intensa ou continuada, mas não crônica, pode causar incapacidade temporária ou danos residuais (p.ex. clorofórmio).">2</span></div> <div title="Reactivity" style="background: transparent; width: 37.5px; height: 2em; text-align: center; vertical-align: middle; position: absolute; top: 26px; left: 37.5px; font-size: large;"><span class="abbr" style="color: black;" title="Reatividade 0. Normalmente estável, mesmo sobre condições de exposição ao fogo, e não é reativo com a água (p.ex. nitrogênio líquido).">0</span></div> <div title="Other hazards" style="background: transparent; width: 75px; height: 2em; text-align: center; vertical-align: middle; position: absolute; top: 47px; font-size: small;"> </div> </div> </td></tr> <tr> <td><a href="/wiki/Frases_de_risco" class="mw-redirect" title="Frases de risco">Frases R</a> </td> <td>- </td></tr> <tr> <td><a href="/wiki/Frases_de_seguran%C3%A7a" class="mw-redirect" title="Frases de segurança">Frases S</a> </td> <td><a href="/wiki/Frases_de_seguran%C3%A7a" class="mw-redirect" title="Frases de segurança"><span class="abbr" style="color: blue; border-bottom: 1px dotted blue" title="S22: Não respirar o pó">S22</span></a> </td></tr> <tr> <td><a href="/wiki/Ponto_de_fulgor" title="Ponto de fulgor">Ponto de fulgor</a> </td> <td>não inflamável </td></tr> <tr> <td><a href="/wiki/Dose_letal_mediana" title="Dose letal mediana">LD<sub>50</sub></a> </td> <td>> 5000 mg·kg<sup>-1</sup> (Rato, oral)<sup id="cite_ref-Merck_1-4" class="reference"><a href="#cite_note-Merck-1"><span>[</span>1<span>]</span></a></sup> </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2">Compostos relacionados </th></tr> <tr> <td>Outros <a href="/wiki/%C3%8Don" title="Íon">aniões</a>/<a href="/wiki/%C3%8Don" title="Íon">ânions</a> </td> <td><a href="/wiki/Fluoreto_de_alum%C3%ADnio" title="Fluoreto de alumínio">fluoreto de alumínio</a><br /> <a href="/wiki/Sulfeto_de_alum%C3%ADnio" title="Sulfeto de alumínio">sulfeto de alumínio</a><br /> <a href="/wiki/Nitreto_de_alum%C3%ADnio" title="Nitreto de alumínio">nitreto de alumínio</a> </td></tr> <tr> <td>Outros <a href="/wiki/%C3%8Don" title="Íon">catiões</a>/<a href="/wiki/%C3%8Don" title="Íon">cátions</a> </td> <td><a href="/wiki/%C3%93xido_de_magn%C3%A9sio" title="Óxido de magnésio">óxido de magnésio</a><br /><a href="/wiki/Tri%C3%B3xido_de_boro" title="Trióxido de boro">trióxido de boro</a><br /><a href="/wiki/Tri%C3%B3xido_de_g%C3%A1lio" class="mw-redirect" title="Trióxido de gálio">trióxido de gálio</a><br /><a href="/w/index.php?title=%C3%93xido_de_%C3%ADndio&action=edit&redlink=1" class="new" title="Óxido de índio (página não existe)">óxido de índio</a><br /><a href="/w/index.php?title=%C3%93xido_de_t%C3%A1lio&action=edit&redlink=1" class="new" title="Óxido de tálio (página não existe)">óxido de tálio</a><br /><a href="/wiki/Di%C3%B3xido_de_sil%C3%ADcio" title="Dióxido de silício">dióxido de silício</a> </td></tr> <tr> <td>Compostos relacionados </td> <td><a href="/wiki/Hidr%C3%B3xido_de_alum%C3%ADnio" title="Hidróxido de alumínio">hidróxido de alumínio</a> </td></tr> <tr> <th style="background: #F8EABA; text-align: center;" colspan="2"><a class="mw-selflink selflink">Página de dados suplementares</a> </th></tr> <tr> <td><a class="mw-selflink-fragment" href="#Estrutura_e_propriedades">Estrutura e propriedades</a> </td> <td><a href="/wiki/%C3%8Dndice_de_refrac%C3%A7%C3%A3o" class="mw-redirect" title="Índice de refracção"><i>n</i></a>, <a href="/wiki/Constante_diel%C3%A9ctrica" class="mw-redirect" title="Constante dieléctrica">ε<sub>r</sub></a>, etc. </td></tr> <tr> <td><a class="mw-selflink-fragment" href="#Propriedades_termodinâmicas">Dados termodinâmicos</a> </td> <td>Phase behaviour<br />Solid, liquid, gas </td></tr> <tr> <td><a class="mw-selflink-fragment" href="#Dados_espectrais">Dados espectrais</a> </td> <td><a href="/wiki/Espectroscopia_UV/vis%C3%ADvel" title="Espectroscopia UV/visível">UV</a>, <a href="/wiki/Espectroscopia_de_infravermelho" title="Espectroscopia de infravermelho">IV</a>, <a href="/wiki/Espectroscopia_de_resson%C3%A2ncia_magn%C3%A9tica_nuclear" class="mw-redirect" title="Espectroscopia de ressonância magnética nuclear">RMN</a>, <a href="/wiki/Espectroscopia_de_massa" class="mw-redirect" title="Espectroscopia de massa">EM</a> </td></tr> <tr> <td style="background: #F8EABA; text-align: center;" colspan="2"><small><b>Exceto onde denotado, os dados referem-se a<br /> materiais sob <a href="/wiki/Condi%C3%A7%C3%B5es_normais_de_temperatura_e_press%C3%A3o" title="Condições normais de temperatura e pressão">condições normais de temperatura e pressão</a></b><br /><b><a href="/wiki/Wikip%C3%A9dia:Informa%C3%A7%C3%A3o_nas_infocaixas_de_qu%C3%ADmica" title="Wikipédia:Informação nas infocaixas de química">Referências e avisos gerais sobre esta caixa</a>.</b><br /><b><a href="/wiki/Wikip%C3%A9dia:Aviso_m%C3%A9dico" title="Wikipédia:Aviso médico">Alerta sobre risco à saúde</a>.</b> </small> </td></tr> </tbody></table> <p>O <b>óxido de alumínio</b> (<a href="/wiki/Alum%C3%ADnio" title="Alumínio">Al</a><sub>2</sub><a href="/wiki/Oxig%C3%A9nio" title="Oxigénio">O</a><sub>3</sub>) é um composto químico de alumínio e oxigénio. Também é conhecido como <b>alumina</b>, um nome usado frequentemente pelas comunidades <a href="/wiki/Mina_(minera%C3%A7%C3%A3o)" title="Mina (mineração)">mineira</a>, de <a href="/wiki/Cer%C3%A2mica" title="Cerâmica">cerâmica</a> e da <a href="/wiki/Ci%C3%AAncia_dos_materiais" title="Ciência dos materiais">ciência dos materiais</a>. </p><p>O <a href="/wiki/%C3%93xido" title="Óxido">óxido</a> de alumínio é o principal componente da <a href="/wiki/Bauxita" title="Bauxita">bauxita</a>, o principal minério de alumínio. Industrialmente, a bauxita é purificada em óxido de alumínio através do <a href="/wiki/Processo_Bayer" title="Processo Bayer">processo Bayer</a>, e o óxido é depois convertido em alumínio metálico pelo <a href="/wiki/Processo_Hall-H%C3%A9roult" title="Processo Hall-Héroult">processo Hall-Héroult</a>. </p><p>As pedras preciosas <a href="/wiki/Rubi" title="Rubi">rubi</a> e <a href="/wiki/Safira" title="Safira">safira</a> são compostas principalmente por óxido de alumínio e as suas cores características são-lhes dadas por traços de impurezas. </p><p>Seu uso mais significativo é na produção do metal alumínio, embora seja usado como um abrasivo devido à sua dureza e como um material <a href="/wiki/Refrat%C3%A1rio" class="mw-redirect" title="Refratário">refratário</a> devido a seu alto ponto de fusão.<sup id="cite_ref-azom_5-0" class="reference"><a href="#cite_note-azom-5"><span>[</span>5<span>]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Obtenção"><span id="Obten.C3.A7.C3.A3o"></span>Obtenção</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%93xido_de_alum%C3%ADnio&veaction=edit&section=1" title="Editar secção: Obtenção" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%93xido_de_alum%C3%ADnio&action=edit&section=1" title="Editar código-fonte da secção: Obtenção"><span>editar código-fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/Ficheiro:Aluminium_oxide.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Aluminium_oxide.jpg/200px-Aluminium_oxide.jpg" decoding="async" width="200" height="267" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Aluminium_oxide.jpg/300px-Aluminium_oxide.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Aluminium_oxide.jpg/400px-Aluminium_oxide.jpg 2x" data-file-width="682" data-file-height="909" /></a><figcaption>Óxido de alumínio</figcaption></figure> <p>A bauxita é constituída por Al<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, e SiO<sub>2</sub>. Estes compostos purificam-se no <i>processo Bayer</i>: </p> <dl><dd>Al<sub>2</sub>O<sub>3</sub> + 3H<sub>2</sub>O + 2NaOH + calor → 2NaAl(OH)<sub>4</sub></dd></dl> <p>O Fe<sub>2</sub>O<sub>3</sub> não é solúvel. O SiO<sub>2</sub> dissolve-se como silicato Si(OH)<sub>6</sub><sup>2-</sup>. Após filtrado, o Fe<sub>2</sub>O<sub>3</sub> é retirado. Quando o líquido proveniente do Método Bayer se resfria, o Al(OH)<sub>3</sub> precipita enquanto o silicato continua em suspensão. Então: </p> <dl><dd>2Al(OH)<sub>3</sub> + calor → Al<sub>2</sub>O<sub>3</sub> + 3H<sub>2</sub>O</dd></dl> <p>O Al<sub>2</sub>O<sub>3</sub> obtido é a alumina. </p> <div class="mw-heading mw-heading2"><h2 id="Propriedades">Propriedades</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%93xido_de_alum%C3%ADnio&veaction=edit&section=2" title="Editar secção: Propriedades" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%93xido_de_alum%C3%ADnio&action=edit&section=2" title="Editar código-fonte da secção: Propriedades"><span>editar código-fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>O óxido de alumínio é um <a href="/wiki/%C3%93xido#Óxidos_anfóteros" title="Óxido">óxido anfótero</a>, reagindo tanto com ácidos quanto com bases. </p><p>O óxido de alumínio é responsável pela resistência às intempéries do alumínio metálico. O metal alumínio é muito suscetível ao oxigênio atmosférico e uma camada fina de óxido de alumínio se forma rapidamente na superfície exposta de metal. Essa camada o protege de oxidação mais profunda. A espessura e as propriedades da camada de óxido podem ser melhoradas por meio de um processo chamado de <a href="/wiki/Anodiza%C3%A7%C3%A3o" title="Anodização">anodização</a>. </p><p>O óxido de alumínio é um excelente isolador térmico e elétrico, mas tem uma <a href="/wiki/Condutividade_t%C3%A9rmica" title="Condutividade térmica">condutividade térmica</a> relativamente alta (30 Wm<sup>−1</sup>K<sup>−1</sup>)<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span>[</span>6<span>]</span></a></sup> para um material cerâmico. Em sua forma cristalina, chamada <a href="/wiki/Cor%C3%ADndon" title="Coríndon">coríndon</a>, tem dureza suficiente para ser empregada como <a href="/wiki/Abrasivo" title="Abrasivo">abrasivo</a> e como componente de ferramentas de corte.<sup id="cite_ref-azom_5-1" class="reference"><a href="#cite_note-azom-5"><span>[</span>5<span>]</span></a></sup> </p><p>Óxido de alumínio em pó é frequentemente empregado como um meio para <a href="/wiki/Cromatografia" title="Cromatografia">cromatografia</a>. </p><p>Em agosto de <a href="/wiki/2004" title="2004">2004</a>, cientistas norte-americanos em trabalho para a <a href="/wiki/3M" title="3M">3M</a> desenvolveram uma técnica para formar uma liga de alumina e <a href="/wiki/Terra_rara" class="mw-redirect" title="Terra rara">terra rara</a>, produzindo um <a href="/wiki/Vidro" title="Vidro">vidro</a> bastante resistente. </p><p>O óxido de alumínio foi removido da lista de produtos químicos da <a href="/wiki/United_States_Environmental_Protection_Agency" class="mw-redirect" title="United States Environmental Protection Agency">EPA</a> em <a href="/wiki/1988" title="1988">1988</a>. </p> <h2 id="Referências" style="cursor: help;" title="Esta seção foi configurada para não ser editável diretamente. Edite a página toda ou a seção anterior em vez disso."><span id="Refer.C3.AAncias"></span>Referências</h2> <div class="reflist" style="list-style-type: decimal;"><div class="mw-references-wrap"><ol class="references"> <li id="cite_note-Merck-1"><span class="mw-cite-backlink">↑ <sup><i><b><a href="#cite_ref-Merck_1-0">a</a></b></i></sup> <sup><i><b><a href="#cite_ref-Merck_1-1">b</a></b></i></sup> <sup><i><b><a href="#cite_ref-Merck_1-2">c</a></b></i></sup> <sup><i><b><a href="#cite_ref-Merck_1-3">d</a></b></i></sup> <sup><i><b><a href="#cite_ref-Merck_1-4">e</a></b></i></sup></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://chemdat.merck.de/documents/sds/emd/deu/de/1010/101095.pdf">SDL Merck</a>. 20. Feb. 2007</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text">Pradyot Patnaik. <i>Handbook of Inorganic Chemicals</i>. McGraw-Hill, 2002, <a href="/wiki/Especial:Fontes_de_livros/0070494398" class="internal mw-magiclink-isbn">ISBN 0070494398</a></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><cite class="citation web">Mallinckrodt Baker, MSDS. <a rel="nofollow" class="external text" href="http://www.jtbaker.com/msds/englishhtml/a2844.htm">«Aluminum Oxide: Material Safety Data Sheet (A28440)»</a></cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fpt.wikipedia.org%3A%C3%93xido+de+alum%C3nio&rft.aufirst=MSDS&rft.aulast=Mallinckrodt+Baker&rft.btitle=Aluminum+Oxide%3A+Material+Safety+Data+Sheet++%28A28440%29&rft.genre=unknown&rft_id=http%3A%2F%2Fwww.jtbaker.com%2Fmsds%2Fenglishhtml%2Fa2844.htm&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text">PAETEC Formelsammlung Ausgabe 2003, Seite 116.</span> </li> <li id="cite_note-azom-5"><span class="mw-cite-backlink">↑ <sup><i><b><a href="#cite_ref-azom_5-0">a</a></b></i></sup> <sup><i><b><a href="#cite_ref-azom_5-1">b</a></b></i></sup></span> <span class="reference-text"><cite class="citation web"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20071010063029/http://www.azom.com/details.asp?ArticleID=1389">«Alumina (Aluminium Oxide) – The Different Types of Commercially Available Grades»</a>. The A to Z of Materials<span class="reference-accessdate">. Consultado em 27 de outubro de 2007</span>. Arquivado do <a rel="nofollow" class="external text" href="http://www.azom.com/details.asp?ArticleID=1389">original</a> em 10 de outubro de 2007</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fpt.wikipedia.org%3A%C3%93xido+de+alum%C3nio&rft.btitle=Alumina+%28Aluminium+Oxide%29+%93+The+Different+Types+of+Commercially+Available+Grades&rft.genre=unknown&rft.pub=The+A+to+Z+of+Materials&rft_id=http%3A%2F%2Fwww.azom.com%2Fdetails.asp%3FArticleID%3D1389&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.makeitfrom.com/data/?material=Alumina">Material Properties Data: Alumina (Aluminum Oxide)</a></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Ligações_externas"><span id="Liga.C3.A7.C3.B5es_externas"></span>Ligações externas</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%C3%93xido_de_alum%C3%ADnio&veaction=edit&section=3" title="Editar secção: Ligações externas" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%C3%93xido_de_alum%C3%ADnio&action=edit&section=3" title="Editar código-fonte da secção: Ligações externas"><span>editar código-fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite class="citation web"><a rel="nofollow" class="external text" href="http://physicsweb.org/article/news/8/8/9">«Artigo da PhysicsWeb sobre a Alumina Transparente»</a> (em inglês)</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fpt.wikipedia.org%3A%C3%93xido+de+alum%C3nio&rft.btitle=Artigo+da+PhysicsWeb+sobre+a+Alumina+Transparente&rft.genre=unknown&rft_id=http%3A%2F%2Fphysicsweb.org%2Farticle%2Fnews%2F8%2F8%2F9&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></li></ul> <ul class="noprint navigation-box" style="border-top: solid silver 1px; 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