| 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. |
| Genre: | Article |
| ProdID: | 70017192 |
| Citation Author: | Mocala, K.; Navrotsky, A.; Sherman, D. M. |
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| Citation End Page: | 95 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Physics and Chemistry of Minerals |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition; 1992; Article; Journal; Physics and Chemistry of Minerals; Mocala, K.; Navrotsky, A.; Sherman, D. M. |
| Citation Start Page: | 88 |
| Citation Volume: | 19 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition; 1992; Article; Journal; Physics and Chemistry of Minerals; Mocala, K.; Navrotsky, A.; Sherman, D. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/BF00198606 |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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