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Fast preparation of AgxPb20SbTe20 (x = 0.5–3) component with high thermoelectric performance by Yueyang Yang; Zehui Liu; Zhifang Zhou; Jin-Le Lan; Mingchu Zou; Yushuai Xu; Yunpeng Zheng; Ce-Wen Nan; Yuan-Hua Lin is a Engineering article available to read on EtoBox.

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PbTe-based quaternary AgPb m SbTe m+2 (LAST) has been a kind of promising thermoelectric materials due to its relatively low lattice thermal conductivity and good electrical performance. However, traditional melting or mechanical alloying methods are time-consuming, which is not suitable for applications. To solve this problem, a fast method combined self-propagating high-temperature synthesis (SHS) with spark plasma sintering (SPS) has been adopted in this work. Nanostructured n-type Ag x Pb 20 SbTe 20 (x = 0.5-3) materials with high thermoelectric performance have been successfully prepared. On one hand, power factors of all samples reached over 1.6 mW⋅m -1 ⋅K -2 at high temperature, because Ag assembles grain boundaries and forms Ag 2 Te precipitates in the SHS process, enhancing the thermoelectric properties by modulation doping, energy filtering and dynamic doping. On the other hand, the Ag 2 Te-PbTe coherent interfaces bring multiple phonon scattering resources to reduce the thermal conductivity. As a result, a high ZT value of ~1.32 at 773 K is achieved in Ag 1.25 Pb 20 SbTe 20 . This work provides a facile, rapid and energy-saving way to prepare PbTe-based materials with go

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Author

Yueyang Yang; Zehui Liu; Zhifang Zhou; Jin-Le Lan; Mingchu Zou; Yushuai Xu; Yunpeng Zheng; Ce-Wen Nan; Yuan-Hua Lin

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)