High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition

K. Mocala, A. Navrotsky, D. M. Sherman

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


A strong anomaly was found in the heat capacity of Co3O4 between 1000 K and the decomposition temperature. This anomaly is not related to the decomposition of Co3O4 to CoO. The measured entropy of transition, ΔS=46±4 J mol-1 K-1 of Co3O4, supports the interpretation that this anomaly reflects a spin unpairing transition in octahedrally coordinated Co3+ cations. Experimental values of heat capacity, heat content and entropy of Co3O4 in the high temperature region are provided. The enthalpy of the spin unpairing transition is 53±4 kJ mol-1 of Co3O4.

Original languageEnglish (US)
Pages (from-to)88-95
Number of pages8
JournalPhysics and Chemistry of Minerals
Issue number2
StatePublished - Aug 1992
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Geochemistry and Petrology


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