Uranium Oxide - Sankauran
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Compounds with oxidation numbers 4 and 6 are commonly known. [Uranium(IV) oxide] Chemical formula: UO 2 . Also known as uranium dioxide. A brown powder obtained by heating uranium oxide (VI) UO 3 in a hydrogen stream at 1000-1100°C for a long period of time and reducing it. Specific gravity: 10.97, melting point: 2176°C. It is easily oxidized even at room temperature to U 4 O 9 , U 3 O 7 , U 3 O 8 , etc. It is insoluble in water and dilute acids, but easily dissolves in concentrated nitric acid and perchloric acid. [Tetrauranium nonaoxide] The chemical formula is U 4 O 9 . It has a superlattice structure in which excess oxygen is inserted between the UO 3 crystal lattices. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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酸化数4,6の化合物が普通に知られている。 ［酸化ウラン(IV)］ 化学式UO2。二酸化ウランともいう。酸化ウラン(VI)UO3を水素気流中1000～1100℃で長時間熱し，還元して得られる褐色粉末。比重10.97，融点2176℃。常温でも容易に酸化されてU4O9,U3O7,U3O8などとなる。水，希酸に不溶，濃硝酸，過塩素酸には容易に溶ける。 ［九酸化四ウラン］ 化学式U4O9。UO3の結晶に過剰の酸素が格子の間に入り込んだ超格子構造をもっている。 出典 株式会社平凡社世界大百科事典 第２版について 情報 |
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