ジオキソウラン(IV)

化学名:ジオキソウラン(IV)

CAS番号.1344-57-6

英語名:URANIUM(IV) OXIDE

CBNumberCB2440097

MFO2U

MW270.02771

别名

ウラニウム(IV)ジオキシド

ジオキソウラン(IV)

二酸化ウラン

ジオキソウラン(IV)物理性質

融点

2500°C

比重(密度)

10,96 g/cm³

溶解性

insoluble in H2O, dilute acid solutions; soluble in conc acid solutions

外見

茶色の立方晶

色

brown cubic crystals, crystalline

電気抵抗率 (resistivity)

3.8 × 10*10 (ρ/μΩ.cm)

水溶解度

不溶性H2O、希酸;可溶性濃酸 [MER06]

Crystal Structure

Cubic

晶系

立方

空间群

Fm3m

晶格常数

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.54581	0.54581	0.54581	90	90	90	0.1626

EPAの化学物質情報

安全性情報

危険有害性情報のコード(GHS)

説明
Uranium dioxide, also known as yellow cake, has a molecular formula of UO2. It is a black crystal that is insoluble in water. It is a high radiation risk and ignites spontaneously in finely divided form. It is used to pack nuclear fuel rods for nuclear reactors.
化学的特性
URANIUM(IV) OXIDE is black crystals. Insoluble inwater; soluble in nitric acid and concentrated sulfuric acid.
物理的性質
Brown to black powder or cubic crystals; density 10.97 g/cm³; Mohs hardness 5.5; melts at 2,827°C; insoluble in water and dilute acids; soluble in concentrated acids.
使用
URANIUM(IV) OXIDE is a crystalline (or pellet) form is used to pack nuclear fuel rods.
使用
Used in nuclear power reactors as nuclear-fuel-sintered element containing either natural or enriched uranium.
製造方法
Uranium dioxide occurs in mineral uraninite. Purified oxide may be obtained from uraninite after purification. The commercial material, however, also is recovered from other uranium sources. Uranium dioxide is obtained as an intermediate during production of uranium metal (See Uranium). Uranyl nitrate, UO₂(NO₃)₂, obtained from digesting the mineral uraninite or pitchblende with concentrated nitric acid and separated by solvent extraction, is reduced with hydrogen at high temperatures to yield the dioxide.
危険性
High radiation risk. Ignites spontaneously in finely divided form.
参考文献
R.E. Rundle, et al., J. Am. Chem. Soc., 70, 99 (1948), DOI: 10.1021/ja01181a029.