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

Physics and Chemistry of Minerals
By: , and 

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Abstract

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, ??S=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. ?? 1992 Springer-Verlag.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition
Series title Physics and Chemistry of Minerals
DOI 10.1007/BF00198606
Volume 19
Issue 2
Year Published 1992
Language English
Publisher location Springer-Verlag
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Physics and Chemistry of Minerals
First page 88
Last page 95
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