• Source: Cobalt(II,III) oxide

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.




Structure


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.




Synthesis


Cobalt(II) oxide, CoO, converts to Co3O4 upon heating at around 600–700 °C in air. Above 900 °C, CoO is stable. These reactions are described by the following equilibrium:

2 Co3O4 ⇌ 6 CoO + O2




Applications


Cobalt(II,III) oxide is used as a blue coloring agent for pottery enamel and glass, as an alternative to cobalt(II) oxide.
Cobalt(II,III) oxide is used as an electrode in some lithium-ion batteries, possibly in the form of cobalt oxide nanoparticles.




Safety


Cobalt compounds are potentially poisonous in large amounts.




See also


Cobalt(II) oxide
Cobalt(III) oxide




References

Kata Kunci Pencarian:

• Kobalt(II) oksida
• Kromium
• Kobalt(II) hidroksida
• Nikel
• Galium
• Mangan
• Tembaga
• Sianokobalamin
• Unsur golongan 3
• Fluorin
• Cobalt(II,III) oxide
• Cobalt(II) oxide
• Cobalt(III) oxide
• Lithium cobalt oxide
• Cobalt oxide
• Cobalt blue
• Cobalt(II) perchlorate
• Sodium cobalt oxide
• Iron(III) oxide
• Cobalt(II) bromide