Cobalt(II,III) oxide

Cobalt(II,III) oxide
Names
	IUPAC name cobalt(II) dicobalt(III) oxide
	Other names cobalt oxide, cobalt(II,III) oxide, cobaltosic oxide, tricobalt tetroxide
Identifiers
CAS Number	1308-06-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	9826389 ;
ECHA InfoCard	100.013.780
EC Number	215-157-2;
PubChem CID	11651651;
RTECS number	GG2500000;
UNII	USK772NS56 ;
CompTox Dashboard (EPA)	DTXSID80892420 ;
	InChI InChI=1S/3Co.4O Key: LBFUKZWYPLNNJC-UHFFFAOYSA-N ; InChI=1/3Co.4O/rCo2O3.CoO/c3-1-5-2-4;1-2 Key: LBFUKZWYPLNNJC-PMPQCLQHAA;
	SMILES [Co]=O.O=[Co]O[Co]=O;
Properties
Chemical formula	Co3O4; CoO.Co2O3
Molar mass	240.80 g/mol
Appearance	black solid
Density	6.07 g/cm3
Melting point	895 °C (1,643 °F; 1,168 K)
Boiling point	900 °C (1,650 °F; 1,170 K) (decomposes)
Solubility in water	Insoluble
Solubility	soluble (with degradation) in acids and alkalis
Magnetic susceptibility (χ)	+7380·10−6 cm3/mol
Structure
Crystal structure	cubic
Space group	Fd3m, No. 227
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H317, H334, H350, H411
Precautionary statements	P261, P273, P284, P304+P340, P342+P311
NFPA 704 (fire diamond)	2 0 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cobalt(II,III) oxide is an inorganic compound with the formula Co₃O₄. It is one of two well characterized cobalt oxides. It is a black antiferromagnetic solid. As a mixed valence compound, its formula is sometimes written as Co^IICo^III₂O₄ and sometimes as CoO•Co₂O₃.