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Phase Equilibria of the Cu-Se-Te Ternary System

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Abstract

The experimental and thermodynamic descriptions of the Cu-Se-Te ternary system are important in designing alloys for thermoelectric applications. However, information on the Cu-Se-Te ternary system is still lacking in the literature. This study determines the phase equilibria in the isothermal section at 500 °C and liquidus projection of the Cu-Se-Te system by using an experimental and Calphad-approach (Calculation of Phase Diagrams). The isothermal section is determined based on the equilibrated alloys. The liquidus projection is determined based on the results of the primary solidification phase of various Cu-Se-Te alloys in the as-cast condition. Two ternary phases, Cu5Se7Te3 and Cu6Se2Te2, are found. The Calphad-approach is used for thermodynamic modeling of the Cu-Se-Te ternary system by employing thermodynamic descriptions of the three constituent binary systems and the experimental results of the isothermal section and liquidus projection. Very good agreement was obtained between the experiment and calculation.

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Acknowledgments

The authors acknowledge the financial support of the Ministry of Science and Technology, Taiwan (MOST 107–2923-E-007–005-MY3) and (MOST 110–2634-F-007–024).

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Authors and Affiliations

  1. Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan

    Yohanes Hutabalian & Sinn-wen Chen

  2. High Entropy Materials Center, National Tsing Hua University, Hsinchu, Taiwan

    Sinn-wen Chen

  3. Department of Materials Science and Technology, National Dong Hwa University, Hualien, Taiwan

    Wojciech Gierlotka

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  1. Yohanes Hutabalian
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Correspondence to Sinn-wen Chen.

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Hutabalian, Y., Chen, Sw. & Gierlotka, W. Phase Equilibria of the Cu-Se-Te Ternary System. J. Phase Equilib. Diffus. 44, 181–199 (2023). https://doi.org/10.1007/s11669-023-01032-4

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