|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications V
||Phase Diagram of Ternary Cu-Ga-Te System and Thermoelectric Properties of Chalcopyrite CuGaTe2 Materials
||Hsin-jay Wu, Zong-jin Dong
|On-Site Speaker (Planned)
Chalcopyrite CuGaTe2 has been viewed as a promising candidate for use of thermoelectric generator. The 923K isothermal section of ternary Cu-Ga-Te system is determined, and ternary CuGaTe2 phase is stabilized within the compositional region of 48.0-53.0at%Te and 25.0at%-30.0at%Cu. The as-determined isothermal section, depicting the phase stability regime of CuGaTe2, provides options for precisely locating the compositions of CuGaTe2-based materials that lead to promising and reproducible thermoelectric properties. A zT peak of 0.6 has been achieved in the Bridgman-grown Cu25Ga26Te49 alloy at 750K, which is nearly eight times higher than the neighboring Cu28Ga25Te47 alloy, presumably due to the fact that the Cu25Ga26Te49 alloy, which exhibits high phase purity of CuGaTe2, has lower lattice thermal conductivity (κL~1.3 (W/mK) and higher power factor (PF~11.2 (μW/mK2)), comparing with than that of Cu28Ga25Te47 alloy (κL~1.8 (W/mK) and PF~1.9 (μW/mK2)), which locates in a three-phased CuGaTe2+Cu2Te+Cu9Ga4 region, with only a slight deviation in the starting composition.
||Planned: Supplemental Proceedings volume