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Evaluation of thermodynamic and kinetic stability of CuAlO2 and CuGaO2

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Abstract

Thermodynamic and kinetic stabilities of CuAlO2 and CuGaO2 have been evaluated by using thermogravimetry and thermodynamic calculations. It has been revealed that CuAlO2 and CuGaO2 are not thermodynamically stable in air below 800 °C and 1,200 °C, respectively, and that the oxidation reaction, 4CuMO2 + O2 → 2CuO + 2CuM2O4 (M = Al, Ga), should occur if the reaction kinetics are high enough. However, rate constants and activation energies indicated slow kinetics of the oxidation reaction, showing kinetic stability of CuMO2 even under some thermodynamically unstable temperatures and atmospheres. It was also concluded that CuAlO2 showed higher thermodynamic and kinetic stability than CuGaO2.

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Acknowledgements

The authors acknowledge Prof. K. Endoh (College of Humanities and Sciences, Nihon University) for the measurement of particle size distribution with laser diffraction particle size analyzer.

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Authors and Affiliations

  1. Department of Integrated Sciences in Physics and Biology, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajousui, Setagaya-ku, Tokyo, 156-8550, Japan

    Yuh Kumekawa, Motohiro Hirai, Yuhki Kobayashi, Satoshi Endoh, Eri Oikawa & Takuya Hashimoto

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  1. Yuh Kumekawa
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  2. Motohiro Hirai
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  3. Yuhki Kobayashi
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  4. Satoshi Endoh
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  5. Eri Oikawa
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  6. Takuya Hashimoto
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Correspondence to Takuya Hashimoto.

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Kumekawa, Y., Hirai, M., Kobayashi, Y. et al. Evaluation of thermodynamic and kinetic stability of CuAlO2 and CuGaO2 . J Therm Anal Calorim 99, 57–63 (2010). https://doi.org/10.1007/s10973-009-0454-0

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  • DOI: https://doi.org/10.1007/s10973-009-0454-0

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