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- Title
Approaching crystal's limit of thermoelectrics by nano-sintering-aid at grain boundaries.
- Authors
Lei, Jingdan; Zhao, Kunpeng; Liao, Jincheng; Yang, Shiqi; Zhang, Ziming; Wei, Tian-Ran; Qiu, Pengfei; Zhu, Min; Chen, Lidong; Shi, Xun
- Abstract
Grain boundary plays a vital role in thermoelectric transports, leading to distinct properties between single crystals and polycrystals. Manipulating the grain boundary to realize good thermoelectric properties in polycrystals similar as those of single crystals is a long-standing task, but it is quite challenging. Herein, we develop a liquid-phase sintering strategy to successfully introduce Mg2Cu nano-sintering-aid into the grain boundaries of Mg3(Bi, Sb)2-based materials. The nano-aid helps to enlarge the average grain size to 23.7 μm and effectively scatter phonons, leading to excellent electrical transports similar as those of single crystals and ultralow lattice thermal conductivity as well as exceptional thermoelectric figure of merit (1.5 at 500 K) and conversion efficiency (7.4% under temperature difference of 207 K). This work provides a simple but effective strategy for the fabrication of high-performance polycrystals for large-scale applications. The authors develop a liquid-phase sintering strategy to effectively enlarge material's grain sizes, thereby achieving single crystal-like electronic transport properties in polycrystalline Mg3(Bi, Sb)2.
- Subjects
SINGLE crystals; CRYSTAL lattices; THERMOELECTRIC materials; POLYCRYSTALS; THERMAL conductivity; PHONON scattering
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-50946-1