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Oxygen pressure dependence of Cu2O-CuO-Gd2O3 phase diagram

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Abstract

The phase diagram of the Gd-Cu-O system has been investigated under various oxygen partial pressures by thermal analysis. In this system, only one ternary compound Gd2CuO4 exists stably, depending on the oxygen partial pressure. This compound decomposes to Gd2O3 and Cu2O under low oxygen partial pressure at high temperature. The incongruent melting and decomposition temperatures of Gd2CuO4 and the temperature of eutectic reaction have been investigated as a function of oxygen partial pressure. The present ternary system includes two invariant reactions:L + Gd2O3 ⇆ Gd2CuO4 + Cu2O at 1376 K under 0.07 atm O2 (7.09 kPa) andL⇆ Gd2CuO4 + CuO + Cu2O at 1321 K under 0.42 atm O2 (42.56 kPa). The thermodynamic properties of the system have also been considered.

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Authors and Affiliations

  1. Department of Metallurgy, Kyoto University, 606, Kyoto, Japan

    Wei Zhang (Graduate Student) & Kozo Osamura (Professor)

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  1. Wei Zhang
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  2. Kozo Osamura
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Zhang, W., Osamura, K. Oxygen pressure dependence of Cu2O-CuO-Gd2O3 phase diagram. Metall Trans B 22, 705–710 (1991). https://doi.org/10.1007/BF02679026

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  • DOI: https://doi.org/10.1007/BF02679026

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