DataVXAdvanced Functional MaterialsPaper
journal article·2020-05

High Thermoelectric Performance in Sulfide‐Type Argyrodites Compound Ag8Sn(S1−xSex)6 Enabled by Ultralow Lattice Thermal Conductivity and Extended Cubic Phase Regime

Xingchen Shen, Yi Xia, Chun‐Chuen Yang, Zhao Zhang, Shulong Li, Yung‐Hsiang Tung, Allen Benton, Xiao Zhang, Xu Lu, Guoyu Wang, Jian He, Xiaoyuan Zhou

Advanced Functional Materials· Volume 30· Issue 21
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Source abstract

Abstract

Abstract Argyrodites with a general chemical formula of A8BC6 are known for complex phase transitions, ultralow lattice thermal conductivity, and mixed electronic and ionic conduction. The coexistence of ionic conduction and promising thermoelectric performance have recently been reported in selenide and telluride argyrodites, but scarcely in sulfide argyrodites. Here, the thermoelectric properties of Ag8Sn(S1−xSex)6 are reported. Specifically, Ag8SnS6 exhibits intrinsically ultralow lattice thermal conductivities of 0.61–0.31 W m−1 K−1 over the whole temperature range from 32 to 773 K due to distorted local crystal structure, relatively weak chemical bonding, rattler‐like Ag atoms, low‐lying optical modes, and dynamic disorder of Ag ions at high temperatures. Se doping shifts the orthorhombic–cubic phase transition from 457 K at x = 0 to 430 K at x = 0.10, thereby expanding the temperature range of the thermoelectrically favored cubic phase. A figure of merit zT value ≈ 0.80 is achieved at 773 K in Ag8Sn(S1−xSex)6 (x = 0.03), the highest zT value reported in sulfide argyrodites. These results fill a knowledge gap of the thermoelectric study of argyrodites and contribute to a comprehensive understanding of the chemical bonding, lattice dynamics, and thermal transport of argyrodites.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials Chongqing University Chongqing 401331 P. R. China

Department of Physics and Astronomy Clemson University Clemson SC 29634 USA

Chongqing Institute of Green and Intelligent Technology Chinese Academy of Science Chongqing 400714 P. R. China

Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA

Department of Physics Chun Yuan Christian University Chung‐Li District Taoyuan City 32023 Taiwan

Department of Materials and Engineering Clemson University Clemson SC 29634 USA

Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education) Superconductivity and New Energy R&D Center Southwest Jiaotong University Chengdu 610031 China

University of Chinese Academy of Sciences Beijing 100044 P. R. China

Funding

Graduate Scientific Research and Innovation Foundation of Chongqing · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities · China Sponsorship Council

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