Bi掺杂调控Ge0.8Mn0.1Pb0.1Te合金热电性能的研究OA

GeTe-based alloys have attracted considerable attention as promising mid-temperature thermoelectric materials owing to their excellent performance.In this study,a series of Ge0.8-xMn0.1Pb0.1BixTe alloys were synthesized by vacuum melting followed by hot-press sintering.The results demonstrate that Bi incorporation significantly enhances the Seebeck coefficient.With increasing Bi content,the crystal structure gradually evolves from a rhombohedral to a cubic phase.Simultaneously,Bi-induced lattice distortion intensifies phonon scattering,leading to a marked reduction in lattice thermal conductivity,while the electronic thermal conductivity also decreases as a result of reduced electrical conductivity.At 773 K,the total thermal conductivity of Ge0.78Mn0.1Pb0.1Bi0.02Te reaches a low value of 1.34 W/(m·K).Consequently,the alloys exhibit enhanced thermoelectric figure of merit(ZT)values in the low-to-mid temperature range while maintaining high ZTat elevated temperatures,yielding a high average thermoelectric figure of merit(ZT,avg)of 0.80.