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Reference.org
Uranium trioxide
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<p>Uranium trioxide (UO3), also called <a href="/facts/Uranyl/XoqDjPHM">uranyl</a> oxide, uranium(VI) oxide, and uranic oxide, is the hexavalent <a href="/facts/Oxide/DXtoVe1C">oxide</a> of <a href="/facts/Uranium/n2sGWBzU">uranium</a>. The solid may be obtained by heating <a href="/facts/Uranyl_nitrate/RdyzMLgb">uranyl nitrate</a> to 400 °C. Its most commonly encountered <a href="/facts/Polymorphism_(materials_science)/bu2tqsB9">polymorph</a> is amorphous UO3. </p>