Protactinium(IV) oxide
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IUPAC name Protactinium(IV) oxide | |
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Properties | |
Chemical formula | O2Pa |
Molar mass | 263.034 g·mol−1 |
Appearance | Black crystals |
Melting point | 2,927 °C (5,301 °F; 3,200 K)[1] |
Structure | |
Crystal structure | Fluorite (cubic), cF12 |
Space group | Fm3m, No. 225 |
Lattice constant | a = 544.6 pm[1] |
Hazards | |
NFPA 704 (fire diamond) | 4 |
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). Infobox references |
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.[2][3]: 195
As protactinium(IV) oxide, like other protactinium compounds, is radioactive, toxic and very rare, it has no known technological use.
References
- ^ a b 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.
- v
- t
- e
- PaH3
- PaN
- PaO2
- PaCl4
- PaBr4
- PaF4
- PaI4
- PaOCl2
- PaC
- Pa(C8H8)2
- Pa2O5
- PaF5
- PaCl5
- PaBr5
- PaI5
- PaO2F
- PaO2Cl
- PaO2I
- PaO(NO3)3