Protactinium(IV) oxide
Chemical compound From Wikipedia, the free encyclopedia
Chemical compound From Wikipedia, the free encyclopedia
Protactinium(IV) oxide is a chemical compound with the formula PaO2. The black oxide is formed by reducing Pa2O5 with hydrogen at 1 550 °C. Protactinium(IV) oxide does not dissolve in H2SO4, HNO3, or HCl solutions, but reacts with HF.[2][3]: 195
Names | |
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IUPAC name
Protactinium(IV) oxide | |
Identifiers | |
3D model (JSmol) |
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CompTox Dashboard (EPA) |
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Properties | |
O2Pa | |
Molar mass | 263.034 g·mol−1 |
Appearance | Black crystals |
Melting point | 2,927 °C (5,301 °F; 3,200 K)[1] |
Structure | |
Fluorite (cubic), cF12 | |
Fm3m, No. 225 | |
Hazards | |
NFPA 704 (fire diamond) | |
Related compounds | |
Other cations |
Thorium(IV) oxide Uranium(IV) oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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As protactinium(IV) oxide, like other protactinium compounds, is radioactive, toxic and very rare, it has no known technological use.
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