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 Y
3D model (Jmol)	Interactive image
ChemSpider	9826389 Y
ECHA InfoCard	100.013.780
PubChem	11651651
RTECS number	GG2500000
InChI InChI=1S/3Co.4O Y Key: LBFUKZWYPLNNJC-UHFFFAOYSA-N Y 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	6.11 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 in acids and alkalis
Magnetic susceptibility (χ)	+7380·10−6 cm3/mol
Structure
Crystal structure	cubic
Hazards
R-phrases	R40 R41 R42 R43
S-phrases	S36/37
NFPA 704	0 2 0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

CoO.Co₂O₃

Cobalt(II,III) oxide is 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.

Co₃O₄ adopts the normal spinel structure, with Co²⁺ ions in tetrahedral interstices and Co³⁺ ions in the octahedral interstices of the cubic close-packed lattice of oxide anions.

Cobalt(II) oxide, CoO, converts to Co₃O₄ if heated to around 600-700 °C in air. Above 900 °C, CoO is stable. These reaction are described by the following equilibrium:

This inorganic compound is currently utilized in the process of artificial photosynthesis.

Cobalt compounds are potentially poisonous in large amounts.