Protactinium(IV) oxide

Protactinium(IV) oxide
Names
	IUPAC name Protactinium(IV) oxide
Identifiers
CAS Number	12036-03-2;
3D model (JSmol)	Interactive image;
	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.^: 195

As protactinium(IV) oxide, like other protactinium compounds, is radioactive, toxic and very rare, it has no known technological use.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.