Uranium trioxide
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Uranium trioxide (UO3), also called uranyl oxide, uranium(VI) oxide, and uranic oxide, is the hexavalent oxide of uranium. The solid may be obtained by heating uranyl nitrate to 400 °C. Its most commonly encountered polymorph, γ-UO3, is a yellow-orange powder.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC names
Uranium trioxide Uranium(VI) oxide | |
Other names
Uranyl oxide Uranic oxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.014.274 |
EC Number |
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PubChem CID |
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UNII | |
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Properties | |
UO3 | |
Molar mass | 286.29 g/mol |
Appearance | yellow-orange powder |
Density | 5.5–8.7 g/cm3 |
Melting point | ~200–650 °C (decomposes) |
insoluble | |
Structure | |
see text | |
I41/amd (γ-UO3) | |
Thermochemistry | |
Std molar entropy (S⦵298) |
99 J·mol−1·K−1[1] |
Std enthalpy of formation (ΔfH⦵298) |
−1230 kJ·mol−1[1] |
Hazards | |
GHS labelling: | |
Danger | |
H300, H330, H373, H411 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Safety data sheet (SDS) | External MSDS |
Related compounds | |
Uranium dioxide Triuranium octoxide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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