High Quality Content by WIKIPEDIA articles! Cobalt (II,III) oxide is chemical compound with the formula Co3O4. It is a black solid, and a mixed valence compound, containing both Co(II) and Co(III) oxidation states. It can be formulated as CoIICoIII2O4 or 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.

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