|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications X
||Phase Equilibria of Cu-Se-Te System and Interfacial Reactions in Cu/Se, Cu/Se-20at.%Te and Cu2Te/Se Couples
||Yohanes Hutabalian, Sinn-wen Chen
|On-Site Speaker (Planned)
The Cu2Se-based and Cu2Te-based alloys are promising thermoelectric materials. To provide fundamental information which is lacking in literature, the isothermal sections at 500oC, 300oC and liquidus projection of Cu-Se-Te ternary system are experimentally determined. Se-Te is an isomorphous system, but the phase relationships in the Cu-Se and Cu-Te systems are complicated. In the Cu-Se-Te system, there are two ternary compounds, and a continuous solid solution between the congruently melting Cu2Se and Cu2Te phases. The Cu-Se-Te liquidus projection has eleven primary solidification phases. Reaction couples of Cu/Se, Cu/Se-20at%Te, and Cu2Te/Se couples at 300oC are prepared and examined, and complicated reaction phases are observed. For example, after reaction for only 10 min, a very thick layer of 147 mm thickness with various phases is found in the Cu2Te/Se couple. The diffusion path proceeds in the following phase sequence: Se/CuSe2/CuSe/Cu2Se/Te/CuTe/Cu3Te2/Cu2Te. It was found that the diffusion of Cu is faster than other elements.
||Electronic Materials, Joining, Phase Transformations