標題: Thermodynamic Routes to Ultralow Thermal Conductivity and High Thermoelectric Performance
作者: Wei, Pai-Chun
Liao, Chien-Neng
Wu, Hsin-Jay
Yang, Dongwang
He, Jian
Biesold-McGee, Gill V.
Liang, Shuang
Yen, Wan-Ting
Tang, Xinfeng
Yeh, Jien-Wei
Lin, Zhiqun
He, Jr-Hau
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: high-entropy alloys;liquid-like thermoelectrics;phase-boundary mapping;thermodynamics;thermoelectrics
公開日期: 1-一月-1970
摘要: Thermoelectric (TE) research is not only a course of materials by discovery but also a seedbed of novel concepts and methodologies. Herein, the focus is on recent advances in three emerging paradigms: entropy engineering, phase-boundary mapping, and liquid-like TE materials in the context of thermodynamic routes. Specifically, entropy engineering is underpinned by the core effects of high-entropy alloys; the extended solubility limit, the tendency to form a high-symmetry crystal structure, severe lattice distortions, and sluggish diffusion processes afford large phase space for performance optimization, high electronic-band degeneracy, rich multiscale microstructures, and low lattice thermal conductivity toward higher-performance TE materials. Entropy engineering is successfully implemented in half-Huesler and IV-VI compounds. In Zintl phases and skutterudites, the efficacy of phase-boundary mapping is demonstrated through unraveling the profound relations among chemical compositions, mutual solubilities of constituent elements, phase instability, microstructures, and resulting TE properties at the operation temperatures. Attention is also given to liquid-like TE materials that exhibit lattice thermal conductivity at lower than the amorphous limit due to intensive mobile ion disorder and reduced vibrational entropy. To conclude, an outlook on the development of next-generation TE materials in line with these thermodynamic routes is given.
URI: http://dx.doi.org/10.1002/adma.201906457
http://hdl.handle.net/11536/153716
ISSN: 0935-9648
DOI: 10.1002/adma.201906457
期刊: ADVANCED MATERIALS
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