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, 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.
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Mocala, K., Navrotsky, A. & Sherman, D.M. High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition. Phys Chem Minerals 19, 88–95 (1992). https://doi.org/10.1007/BF00198606
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DOI: https://doi.org/10.1007/BF00198606