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Cobalt(II,III) oxide

From Wikipedia, the free encyclopedia
Cobalt(II,III) oxide[1]
Cobalt(II,III) oxide
Cobalt(II,III) oxide
Ball-and-stick model of the unit cell of Co3O4
Ball-and-stick model of the unit cell of Co3O4
Names
IUPAC name
cobalt(II) dicobalt(III) oxide
Other names
cobalt oxide, cobalt(II,III) oxide, cobaltosic oxide, tricobalt tetroxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.013.780Edit this at Wikidata
EC Number
  • 215-157-2
RTECS number
  • GG2500000
UNII
  • InChI=1S/3Co.4O checkY
    Key: LBFUKZWYPLNNJC-UHFFFAOYSA-N checkY
  • InChI=1/3Co.4O/rCo2O3.CoO/c3-1-5-2-4;1-2
    Key: LBFUKZWYPLNNJC-PMPQCLQHAA
  • [Co]=O.O=[Co]O[Co]=O
Properties
Co3O4

CoO.Co2O3

Molar mass240.80 g/mol
Appearanceblack solid
Density6.07 g/cm3[2]
Melting point895 °C (1,643 °F; 1,168 K)
Boiling point900 °C (1,650 °F; 1,170 K) (decomposes)
Insoluble
Solubilitysoluble (with degradation) inacids andalkalis
+7380·10−6 cm3/mol
Structure
cubic
Fd3m, No. 227[3]
Hazards
GHS labelling:
GHS09: Environmental hazardGHS08: Health hazard
Danger
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 theirstandard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Chemical compound

Cobalt(II,III) oxide is aninorganic compound with theformula Co3O4. It is one of two well characterizedcobalt oxides. It is a blackantiferromagnetic solid. As amixed valence compound, its formula is sometimes written as CoIICoIII2O4 and sometimes as CoO•Co2O3.[4]

Structure

[edit]

Co3O4 adopts thenormal spinel structure, with Co2+ ions in tetrahedral interstices and Co3+ ions in the octahedral interstices of thecubicclose-packedlattice ofoxide anions.[4]

tetrahedral coordination geometry of Co(II)distortedoctahedral coordination geometry of Co(III)distorted tetrahedral coordination geometry of O

Synthesis

[edit]

Cobalt(II) oxide, CoO, converts to Co3O4 upon heating at around 600–700 °C in air.[4] Above 900 °C, CoO is stable.[4][5] These reactions are described by the following equilibrium:

2 Co3O4 ⇌ 6 CoO + O2

Applications

[edit]

Cobalt(II,III) oxide is used as a blue coloring agent forpotteryenamel andglass, as an alternative to cobalt(II) oxide.[6]

Cobalt(II,III) oxide is used as an electrode in somelithium-ion batteries, possibly in the form ofcobalt oxide nanoparticles.

Safety

[edit]

Cobalt compounds are potentially poisonous in large amounts.[7]

See also

[edit]

References

[edit]
  1. ^"Cobalt(II,III) oxide 203114".Sigma-Aldrich.
  2. ^Lide, David R., ed. (2006).CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, Florida:CRC Press.ISBN 0-8493-0487-3.
  3. ^"mp-18748: Co3O4 (cubic, Fd-3m, 227)".materialsproject.org. Retrieved2019-12-20.
  4. ^abcdGreenwood, Norman N.; Earnshaw, Alan (1997).Chemistry of the Elements (2nd ed.).Butterworth-Heinemann. p. 1118.doi:10.1016/C2009-0-30414-6.ISBN 978-0-08-037941-8.
  5. ^Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1520.
  6. ^Frank Hamer, Janet Hamer (2004):The Potter's Dictionary of Materials and Techniques. University of Pennsylvania Press; 437 pp.ISBN 0812238109
  7. ^MSDS[permanent dead link]
Cobalt(I)
Cobalt(II)
Cobalt(0,III)
Cobalt(II,III)
Cobalt(III)
Cobalt(III,IV)
Cobalt(IV)
Cobalt(V)
Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted byoxidation state.Category:Oxides
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