About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIV
|
| Presentation Title |
B-11: Liquidus Projection of Cu-Se-Te Ternary System |
| Author(s) |
Cheng-Hsi Ho, Yung-Jen Chuang, Yung-Chun Tsai, Sinn-wen Chen |
| On-Site Speaker (Planned) |
Cheng-Hsi Ho |
| Abstract Scope |
Cu-Se-Te is an important thermoelectric material system. Alloys were prepared with pure constituent elements. The solidified alloys were examined to determine their primary solidification phases and the boundaries of the miscibility gaps. Interestingly, Cu-Se-Te exhibits liquid miscibility gaps across large compositional ranges. There are even continuous liquid miscibility gaps extending through the Cu-rich side. In the Cu-Se-Te system, there are ten primary solidification phases, including two ternary compounds Cu5Se7Te3 and Cu6Se2Te2 and two solid solution phases Cu2(Se, Te) and (Se, Te). The boundaries of the liquid miscibility gaps are within the Cu5Se7Te3 and Cu₂(Se, Te) primary solidification phase regime. When molten alloys solidify through these liquid miscibility gaps, liquid phases of different compositions are formed, resulting in unique microstructures. A CALPHAD assessment is carried out in this study. Ternary parameters are introduced in the liquid phase to reproduce the phase boundaries and the invariant reaction temperatures from the experimental results. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Phase Transformations, |