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|Section2= |Section3= |Section5= }} Uranium hydride, also called uranium trihydride (UH3), is an inorganic compound and a hydride of uranium. ==Properties== Uranium hydride is a highly toxic, brownish gray to brownish black pyrophoric powder or brittle solid. Its specific gravity at 20 °C is 10.95, much lower than that of uranium (19.1). It has a metallic conductivity, is slightly soluble in hydrochloric acid and decomposes in nitric acid. Two crystal modifications of uranium hydride exist, both cubic: an α form that is obtained at low temperatures and a β form that is grown when the formation temperature is above 250 °C.〔 After growth, both forms are metastable at room temperature and below, but the α form slowly converts to the β form upon heating to 100 °C. Both α- and β-UH3 are ferromagnetic at temperatures below ~180 K. Above 180 K, they are paramagnetic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「uranium hydride」の詳細全文を読む スポンサード リンク
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