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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
Presentation Title Phase Diagram of Ag-In-Se System and Thermoelectric Properties of In-containing Ag2Se
Author(s) Sinn-wen Chen, Zi-yang Huang, Pai-chen Wei, Yang-yuan Chen
On-Site Speaker (Planned) Sinn-wen Chen
Abstract Scope The Ag<SUB>2</SUB>Se is the only compound in the binary Ag-Se system, and it has a phase transition at 134<SUP>o</SUP>C. The low temperature phase, β-Ag<SUB>2</SUB>Se, is a promising room-temperature thermoelectric material. This study examines the thermoelectric properties of In-containing Ag<SUB>2</SUB>Se phase. Samples of Ag<SUB>2</SUB>Se phase of undoped and various degrees of In-doping are prepared. Their Seebeck coefficient, resistivity, power factor, thermal diffusivity, carrier concentration and Hall coefficient are determined, and their figure-of-merit values are calculated. It is observed that the Seebeck coefficients and thermal diffusivities increase while the power factors decrease dramatically with the phase transition. The Ag-In-Se phase diagrams are determined both by Calphad calculation and experimental determination. There are many binary intermediate phases, and a ternary compound, AgInSe<SUB>2</SUB>, is found. The phase diagram provides important basic information for discussion of thermoelectric properties. Although substantial effect is observed of indium doping, the indium solubilities in the Ag<SUB>2</SUB>Se phase is small.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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