| Names | |
|---|---|
| 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 |
| 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
| |
| 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 ※, 100 kPa).
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Chemical compound
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.
References※
- ^ Christine Guéneau; Alain Chartier; Paul Fossati; Laurent Van Brutzel; Philippe Martin (2020). "Thermodynamic and Thermophysical Properties of the——Actinide Oxides". Comprehensive Nuclear Materials 2nd Ed. 7: 111–154. doi:10.1016/B978-0-12-803581-8.11786-2. ISBN 9780081028667. S2CID 261051636.
- ^ Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds. And the Metal". Journal of the American Chemical Society. 76 (23): 5935. doi:10.1021/ja01652a011.
- ^ Boris F. Myasoedov, H. W. Kirby, & Ivan G. Tananaev (2006) Protactinium, Chapter 4 in Morss, Lester R. & Edelstein, Norman M. & Fuger, Jean, (edit.) The Chemistry of the Actinide and Transactinide Elements Archived 2017-08-26 at the Wayback Machine (PDF) (3. painos). Dordrecht: Springer. ss. 161–252.
