摘要
Multielement alloying is an appealing approach for suppressing thermal conductivity of thermoelectric materials. In this study, we synthesized GeTe-based high-entropy alloys with notable (S, Se) substitution at Te sites and (Ag, Sb) at Ge sites. The Ge <sub>0.82</sub> Ag <sub>0.08</sub> Sb <sub>0.1</sub> S <sub>0.5</sub> Se <sub>0.1</sub> Te <sub>0.4</sub> exhibits an extremely low thermal conductivity of ∼ 0.66 W/m⋅K and a high Seebeck coefficient (>250 μV/K) over a temperature range of 150 – 400 °C. The influence of lattice distortion on phase transformation and transport properties of Ge <sub>0.9-2x</sub> Ag <sub>2x</sub> Sb <sub>0.1</sub> S <sub>0.5</sub> Se <sub>0.1</sub> Te <sub>0.4</sub> (x = 0 – 0.06) was investigated.