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 CoIICoIII2O4 and sometimes as CoO•Co2O3.
cobalt(II) dicobalt(III) oxide
cobalt oxide, cobalt(II,III) oxide, cobaltosic oxide, tricobalt tetroxide
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||240.80 g/mol|
|Melting point||895 °C (1,643 °F; 1,168 K)|
|Boiling point||900 °C (1,650 °F; 1,170 K) (decomposes)|
|Solubility||soluble (with degradation) in acids and alkalis|
|Fd3m, No. 227|
|H317, H334, H350, H411|
|P261, P273, P284, P304+P340, P342+P311|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
(what is ?)
|tetrahedral coordination geometry of Co(II)||distorted octahedral coordination geometry of Co(III)||distorted tetrahedral coordination geometry of O|
Cobalt compounds are potentially poisonous in large amounts.