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== Structure ==
== Structure ==
Co<sub>3</sub>O<sub>4</sub> adopts the [[Spinel#The spinel structure|spinel structure]], with Co<sup>2+</sup> ions in tetrahedral interstices and Co<sup>3+</sup> ions in the octahedral interstices of the [[cubic crystal system|cubic]] [[close-packing|close-packed]] [[crystal lattice|lattice]] of [[oxide]] anions.<ref name="G&E" />
Co<sub>3</sub>O<sub>4</sub> adopts the [[Spinel#The normal spinel structure|spinel structure]], with Co<sup>2+</sup> ions in tetrahedral interstices and Co<sup>3+</sup> ions in the octahedral interstices of the [[cubic crystal system|cubic]] [[close-packing|close-packed]] [[crystal lattice|lattice]] of [[oxide]] anions.<ref name="G&E" />


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Revision as of 16:41, 12 October 2017

Cobalt(II,III) oxide[1]
Cobalt(II,III) oxide
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 InfoCard 100.013.780 Edit this at Wikidata
RTECS number
  • GG2500000
  • 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 mass 240.80 g/mol
Appearance black solid
Density 6.11 g/cm3
Melting point 895 °C (1,643 °F; 1,168 K)
Boiling point 900 °C (1,650 °F; 1,170 K) (decomposes)
Insoluble
Solubility soluble in acids and alkalis
+7380·10−6 cm3/mol
Structure
cubic
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

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.[2]

Structure

Co3O4 adopts the spinel structure, with Co2+ ions in tetrahedral interstices and Co3+ ions in the octahedral interstices of the cubic close-packed lattice of oxide anions.[2]

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.[3] Above 900 °C, CoO is stable.[3][4] These reaction are described by the following equilibrium:

2 Co3O4 ⇌ 6 CoO + O2

Safety

Cobalt compounds are potentially poisonous in large amounts.[5]

See also

References

  1. ^ Sigma-Aldrich product page
  2. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1118. ISBN 978-0-08-037941-8.
  3. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1118. ISBN 978-0-08-037941-8.
  4. ^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1520.
  5. ^ MSDS[permanent dead link‍]
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