期刊
MATERIALS TODAY PHYSICS
卷 13, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtphys.2020.100190
关键词
Thermoelectric materials; Thermal stability; Multiphase; Coarsening rate
资金
- Australian Research Council (ARC) [DE130100310]
- Australian Government
The performance of nanostructured bulk thermoelectric material is shown to be enhanced because of phonon scattering. However, it is well-known that microstructures evolve by thermal aging, and their stability at the operating temperature is of vital importance to the success of the device. Here, we investigate the effect of long-term annealing (up to 8 weeks) on thermoelectric performance and microstructure of a high-efficiency Na-doped multiphase quaternary Pb chalcogenides. A zT of similar to 1.7-1.9 in the 700-850 K temperature range is achieved at all stages of thermal aging. A redistribution of Na-dopant between phases above similar to 630 K is believed to explain an increasing electrical resistivity in aged samples. This is balanced by a reduced total thermal conductivity as thermal aging time increases, possibly because of an increased concentration of nanoscale precipitates in samples aged for 8 weeks. Intermediate annealing of nanostructured lead chalcogenides has been shown to be an effective means of preparing thermally stable, high-performance thermoelectric materials. We have also determined the precipitates coarsening rate constant, k, to be 0.0206 mu m/h(1/3). (C) 2020 Elsevier Ltd. All rights reserved.
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