Uranium trioxide
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.
| Names | |
|---|---|
| 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 |
Std enthalpy of formation (ΔfH⦵298) |
−1230 kJ·mol−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).
Infobox references | |
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