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

Physics and Chemistry of Minerals

By:
, , and
DOI: 10.1007/BF00198606

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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