| Identification | Back Directory | [Name]
URANIUM(IV) OXIDE | [CAS]
1344-57-6 | [Synonyms]
UO2
Uranyl(VI)
dioxouranium
diketouranium
uranous oxide
URANIUM OXIDE
Uranium(Ⅳ)oxide
URANIUM DIOXIDE
URANIUM(IV) OXIDE
uraniumoxide(uo2)
Uranium oxide(IV)
Uranium(IV)dioxide
Uranium oxide (UO2)
Uranium(4) oxide, red
URANIUM (IV) OXIDE 99.8%
URANIUM OXIDE BROWN-BLACK
Nuclear reference material 238UO2 A
Nuclear reference material 238UO2 B
Uranium(IV) oxide: (Uranium black oxide)
Uranium(IV) oxide nuclear reference material, Uranium(IV) oxide | [EINECS(EC#)]
215-700-3 | [Molecular Formula]
O2U | [MDL Number]
MFCD00049692 | [MOL File]
1344-57-6.mol | [Molecular Weight]
270.03 |
| Chemical Properties | Back Directory | [Melting point ]
2500°C | [density ]
10,96 g/cm3 | [solubility ]
insoluble in H2O, dilute acid solutions; soluble in conc acid solutions | [form ]
brown cubic crystals | [color ]
brown cubic crystals, crystalline | [Resistivity]
3.8 × 10*10 (ρ/μΩ.cm) | [Water Solubility ]
insoluble H2O, dilute acids; soluble conc acids [MER06] | [Crystal Structure]
Cubic | [EPA Substance Registry System]
Uranium oxide (UO2) (1344-57-6) |
| Hazard Information | Back Directory | [Chemical Properties]
Black crystals. Insoluble
inwater; soluble in nitric acid and concentrated
sulfuric acid. | [Uses]
A crystalline (or pellet) form is used to pack
nuclear fuel rods. | [Hazard]
High radiation risk. Ignites spontaneously
in finely divided form. | [Description]
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. | [Physical properties]
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. | [Preparation]
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. |
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