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Thermodynamic assessment of the Co-O system

  • Basic And Applied Research
  • Published:
Journal of Phase Equilibria

Abstract

The thermodynamic properties of CoO, Co3O4, and the liquid phase were assessed, and an optimized set of parameters of Gibbs energy functions is proposed. The two stable solid oxides, CoO and Co3O4, were both treated as stoichimetric compounds. The paramagneticantiferromagnetic transition of CoO is well represented by a magnetic ordering model. The Co3O4 spinel phase was described as a normal spinel at room temperature and with cation redistribution at high temperatures. A high-temperature anomaly of Co3O4 was interpreted as a normal-inverse spinel transition. An ionic two-sublattice model was used to model the liquid phase. A calculated phase diagram is presented, and values for the thermodynamic properties are compared with experimental data.

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Authors and Affiliations

  1. Institute of Nonmetallic Materials, Department of Materials, Swiss Federal Institute of Technology (ETH-Zürich), Ch-8092, Zürich, Switzerland

    Ming Chen, Bengt Hallstedt & Ludwig J. Gauckler

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  1. Ming Chen
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  2. Bengt Hallstedt
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  3. Ludwig J. Gauckler
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Chen, M., Hallstedt, B. & Gauckler, L.J. Thermodynamic assessment of the Co-O system. JPE 24, 212–227 (2003). https://doi.org/10.1361/105497103770330514

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  • DOI: https://doi.org/10.1361/105497103770330514

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