|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
||Phase Diagram of Ag-In-Se System and Thermoelectric Properties of In-containing Ag2Se
||Sinn-wen Chen, Zi-yang Huang, Pai-chen Wei, Yang-yuan Chen
|On-Site Speaker (Planned)
The Ag2Se is the only compound in the binary Ag-Se system, and it has a phase transition at 134oC. The low temperature phase, β-Ag2Se, is a promising room-temperature thermoelectric material. This study examines the thermoelectric properties of In-containing Ag2Se phase. Samples of Ag2Se 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, AgInSe2, 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 Ag2Se phase is small.
||Planned: Supplemental Proceedings volume