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Hierarchical Chemical Bonds Contributing to the Intrinsically Low Thermal Conductivity in α-MgAgSb Thermoelectric Materials
Ying, Pingjun1; Li, Xin2; Wang, Yancheng3; Yang, Jiong2; Fu, Chenguang1; Zhang, Wenqing2; Zhao, Xinbing1; Zhu, Tiejun1
2017
Source PublicationAdvanced Functional Materials
ISSN1616301X
Volume27Issue:1
AbstractUnderstanding the lattice dynamics and phonon transport from the perspective of chemical bonds is essential for improving and finding high-efficiency thermoelectric materials and for many applications. Here, the coexistence of global and local weak chemical bonds is elucidated as the origin of the intrinsically low lattice thermal conductivity of non-caged structure Nowotny–Juza compound, α-MgAgSb, which is identified as a new type of promising thermoelectric material in the temperature range of 300–550 K. The global weak bonds of the compound lead to a low sound velocity. The unique three-centered MgAgSb bonds in α-MgAgSb vibrate locally and induce low-frequency optical phonons, resulting in “rattling-like” thermal damping to further reduce the lattice thermal conductivity. The hierarchical chemical bonds originate from the low valence electron count of α-MgAgSb, with the feature shared by Nowotny–Juza compounds. Low lattice thermal conductivities are therefore highly possible in this series of compounds, which is verified by phonon and bulk modulus calculations on some of the compositions. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI10.1002/adfm.201604145
EI Accession Number20164703040430
EI KeywordsThermal conductivity
EI Classification Number615.4 Thermoelectric Energy - 641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 744.8 Laser Beam Interactions - 801.4 Physical Chemistry - 802.2 Chemical Reactions - 933.1.1 Crystal Lattice
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25948
Collection中国科学院上海硅酸盐研究所
Affiliation1.State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou; 310027, China;
2.Materials Genome Institute, Shanghai University, 99 Shangda Road, Shanghai; 200444, China;
3.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China
Recommended Citation
GB/T 7714
Ying, Pingjun,Li, Xin,Wang, Yancheng,et al. Hierarchical Chemical Bonds Contributing to the Intrinsically Low Thermal Conductivity in α-MgAgSb Thermoelectric Materials[J]. Advanced Functional Materials,2017,27(1).
APA Ying, Pingjun.,Li, Xin.,Wang, Yancheng.,Yang, Jiong.,Fu, Chenguang.,...&Zhu, Tiejun.(2017).Hierarchical Chemical Bonds Contributing to the Intrinsically Low Thermal Conductivity in α-MgAgSb Thermoelectric Materials.Advanced Functional Materials,27(1).
MLA Ying, Pingjun,et al."Hierarchical Chemical Bonds Contributing to the Intrinsically Low Thermal Conductivity in α-MgAgSb Thermoelectric Materials".Advanced Functional Materials 27.1(2017).
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