Protactinium(IV) oxide
| Names | |
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| IUPAC name
Protactinium(IV) oxide
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| 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) |
| Structure | |
| Fluorite (cubic), cF12 | |
| Fm3m, No. 225 | |
a = 544.6 pm
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| Hazards | |
| NFPA 704 (fire diamond) | |
| Related compounds | |
Other cations
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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).
Infobox references
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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.
As protactinium(IV) oxide, like other protactinium compounds, is radioactive, toxic and very rare, it has no known technological use.