High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition
Physics and Chemistry of Minerals
By: K. Mocala, A. Navrotsky, and David M. Sherman
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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.
| 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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