Names | |
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IUPAC names
Uranium dioxide
Uranium(IV) oxide | |
Other names
Urania
Uranous oxide | |
Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.014.273 |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
UO2 | |
Molar mass | 270.03 g/mol |
Appearance | black powder |
Density | 10.97 g/cm3 |
Melting point | 2,865 °C (5,189 °F; 3,138 K) |
insoluble | |
Structure | |
Fluorite (cubic), cF12 | |
Fm3m, No. 225 | |
a = 547.1 pm [1]
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Tetrahedral (O2−); cubic (UIV) | |
Thermochemistry | |
Std molar
entropy (S⦵298) |
78 J·mol−1·K−1[2] |
Std enthalpy of
formation (ΔfH⦵298) |
−1084 kJ·mol−1[2] |
Hazards | |
GHS labelling: | |
Danger | |
H300, H330, H373, H410 | |
P260, P264, P270, P271, P273, P284, P301+P310, P304+P340, P310, P314, P320, P321, P330, P391, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | N/A |
Safety data sheet (SDS) | ICSC 1251 |
Related compounds | |
Other anions
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Uranium(IV) sulfide Uranium(IV) selenide |
Other cations
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Protactinium(IV) oxide Neptunium(IV) oxide |
Triuranium octoxide Uranium trioxide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Uranium dioxide or uranium(IV) oxide (UO2), also known as urania or uranous oxide, is an oxide of uranium, and is a black, radioactive, crystalline powder that naturally occurs in the mineral uraninite. It is used in nuclear fuel rods in nuclear reactors. A mixture of uranium and plutonium dioxides is used as MOX fuel. Prior to 1960, it was used as yellow and black color in ceramic glazes and glass.