Protactinium(IV) oxide

Protactinium(IV) oxide
Names
	IUPAC name Protactinium(IV) oxide
Identifiers
CAS Number	12036-03-2;
3D model (JSmol)	Interactive image;
CompTox Dashboard (EPA)	DTXSID701029533 ;
	InChI InChI=1S/2O.Pa Key: FUMADFKVOBAYPE-UHFFFAOYSA-N ;
	SMILES O=[Pa]=O;
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)
Structure
Crystal structure	Fluorite (cubic), cF12
Space group	Fm3m, No. 225
Lattice constant	a = 544.6 pm
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

Protactinium(IV) oxide is a chemical compound with the formula Pa O₂. 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.

^ ^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.

[cry-1] 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.

[2] 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.

[Myasoedov-3] 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.

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