Uranium dioxide
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.
| 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 |
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PubChem CID |
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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 | |
| Tetrahedral (O2−); cubic (UIV) | |
| Thermochemistry | |
Std molar entropy (S⦵298) |
78 J·mol−1·K−1 |
Std enthalpy of formation (ΔfH⦵298) |
−1084 kJ·mol−1 |
| 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 |
Uranium(IV) sulfide Uranium(IV) selenide |
Other cations |
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).
Infobox references | |
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