Cobaltocobaltic Oxide

Name:
Cobaltocobaltic Oxide
Detailed information:

Chemistry name:	tricobalt tetraoxide
M Formula:	Co3O4
Properties:
Steel-gray to black in anhydrous form. D 6.07; changes to cobaltous oxide at 900–950C. Insoluble in water, hydrochloric and nitric acids; soluble in sulfuric acid and fused sodium hydroxide; hygroscopic.
Derivation:
By heating strongly other cobalt oxides in air. Thus, the commercial oxides contain a substantial quantity of Co3O4.
Use:
Ceramics, pigments, catalyst, preparation of cobalt metal, semiconductors.