Английская Википедия:Cobalt(II,III) oxide

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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.[1]

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.[1]

Файл:Cobalt(II,III)-oxide-xtal-2006-Co(II)-coord-CM-3D-balls.png Файл:Cobalt(II,III)-oxide-xtal-2006-Co(III)-coord-CM-3D-balls.png Файл:Cobalt(II,III)-oxide-xtal-2006-O-coord-CM-3D-balls.png
tetrahedral coordination geometry of Co(II) distorted octahedral coordination geometry of Co(III) distorted tetrahedral coordination geometry of O

Synthesis

Cobalt(II) oxide, CoO, converts to Co3O4 upon heating at around 600–700 °C in air.[1] Above 900 °C, CoO is stable.[1][2] These reactions are described by the following equilibrium:

2 Co3O4 Шаблон:Eqm 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.[3]

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.[4]

See also

References

Шаблон:Reflist

Шаблон:Cobalt compounds Шаблон:Oxides Шаблон:Oxygen compounds

  1. 1,0 1,1 1,2 1,3 Шаблон:Greenwood&Earnshaw2nd
  2. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1520.
  3. Frank Hamer, Janet Hamer (2004): The Potter's Dictionary of Materials and Techniques. University of Pennsylvania Press; 437 pp. Шаблон:ISBN
  4. MSDSШаблон:Dead link