Polonium dioxide

Polonium dioxide
	; Unit cell of cubic polonium dioxide (white = Po, yellow = O)
Names
	Systematic IUPAC name Polonium dioxide
Identifiers
CAS Number	7446-06-2;
ChemSpider	52083691;
UNII	JC742031MY ;
Properties
Chemical formula	PoO2
Molar mass	240.98 g/mol
Appearance	pale yellow crystalline solid
Density	8.9 g/cm3
Melting point	500 °C (932 °F; 773 K) (decomposes); sublimes at 885 °C (under oxygen)
Structure
Crystal structure	fluorite, Pearson symbol cF12
Space group	Fm3m (No 225)
Lattice constant	a = 0.5637 nm
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Polonium dioxide (also known as polonium(IV) oxide) is a chemical compound with the formula Po O₂. It is one of three oxides of polonium, the other two being polonium monoxide (PoO) and polonium trioxide (PoO₃). It is a pale yellow crystalline solid at room temperature. Under lowered pressure (such as a vacuum), it decomposes into elemental polonium and oxygen at 500 °C. It is the most stable oxide of polonium and is an interchalcogen.^[5]

^ ^a ^b ^c ^d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.81. ISBN 978-1-4398-5511-9.
^ ^a ^b ^c Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 594, ISBN 0-12-352651-5
^ ^a ^b Bagnall, K. W.; D'Eye, R. W. M. (1954). "The Preparation of Polonium Metal and Polonium Dioxide". J. Chem. Soc. RSC: 4295–4299. doi:10.1039/JR9540004295. Retrieved 12 June 2012.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 780. ISBN 978-0-08-037941-8.
^ Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 585, ISBN 0-12-352651-5

[CRC-1] Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. p. 4.81. ISBN 978-1-4398-5511-9.

[Holleman&Wiberg-2] Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 594, ISBN 0-12-352651-5

[Bagnall-3] Bagnall, K. W.; D'Eye, R. W. M. (1954). "The Preparation of Polonium Metal and Polonium Dioxide". J. Chem. Soc. RSC: 4295–4299. doi:10.1039/JR9540004295. Retrieved 12 June 2012.

[Greenwood-4] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 780. ISBN 978-0-08-037941-8.

[5] Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 585, ISBN 0-12-352651-5

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Names
Unit cell of cubic polonium dioxide (white = Po, yellow = O)
Systematic IUPAC name Polonium dioxide
Identifiers
CAS Number	7446-06-2
ChemSpider	52083691
UNII	JC742031MY^Y
Properties
Chemical formula	PoO₂
Molar mass	240.98 g/mol^[1]
Appearance	pale yellow crystalline solid^[1]^[2]^[3]
Density	8.9 g/cm³^[1]
Melting point	500 °C (932 °F; 773 K) (decomposes)^[1]^[2] sublimes at 885 °C (under oxygen)^[2]^[4]
Structure
Crystal structure	fluorite, Pearson symbol cF12
Space group	Fm3m (No 225)
Lattice constant	a = 0.5637 nm^[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references