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Thermoelectric properties of Bi-doped Ge0.8Mn0.1Pb0.1Te alloys

Year: 2026

Type: article

Abstract: 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 Ge0.8-xMn0.1Pb0.1Bi0.02Te 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.

Source: DOAJ (DOAJ: Directory of Open Access Journals)

DOI: 10.3976/j.issn.1002-4026.2025171

Author: SUN Bing, WANG Qidong, ZHANG Junxiang, MENG Zhenzhen, CHEN Tingting

Institution: Weifang University

Language: Chinese

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

OpenAlex ID: W7153165359

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