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High-Temperature Structural and Thermoelectric Study,of Argyrodite Ag8GeSe6

文献类型：期刊论文

作者Shen, Xingchen1,2,3,4; Yang, Chun-Chuen5; Liu, Yamei2; Wang, Guiwen6; Tan, Huan1; Tung, Yung-Hsiang5; Wang, Guoyu3,4; Lu, Xu1; He, Jian2; Zhou, Xiaoyuan1,6
刊名ACS APPLIED MATERIALS & INTERFACES
出版日期2019-01-16
卷号11期号:2页码:2168-2176
关键词Ag8GeSe6 argyrodites crystal structure lattice dynamics elastic properties thermoelectric properties
ISSN号1944-8244
DOI10.1021/acsami.8b19819
通讯作者He, Jian(jianhe@g.clemson.edu) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
英文摘要Argyrodites with a general chemical formula of A(8)BX(6) (A = Cu, Ag; B = Si, Ge, Sn; and X = S, Se, and Te) are known for the intimate interplay among mobile ions, electrons, and phonons, which yields rich material physics and materials chemistry phenomena. In particular, the coexistence of fast ionic conduction and promising thermoelectric performance in Ag8GeTe6, Ag8SnSe6, Ag8SiTe6, Ag8SiSe6, and Cu8GeSe6 at high temperatures ushered us to their chemical neighbor Ag8GeSe6, whose high-temperature crystal structure and thermoelectric properties are not yet reported. In this work, we have employed a growth-from-the-melt technique followed by hot pressing to prepare polycrystalline Ag8GeSe6 samples, on which the crystal structure, micro-morphology, compositional analysis, UV vis absorption, specific heat, speed of sound, and thermoelectric properties were characterized as a function of the Se-deficiency ratio and temperature. We found that (i) the crystal structure of Ag8GeSe6 evolved from orthorhombic at room temperature to face center cubic above 410 K, with a region of phase separations in between; (ii) like other argyrodite 816 phases, Ag8GeSe6 exhibited ultralow thermal conductivities over a wide temperature range as the phonon mean free path was down to the order of interatomic spacing; and (iii) varying Se deficiency effectively optimized the carrier concentration and power factor, a figure of merit zT value similar to 0.55 was achieved at 923 K in Ag8GeSe5.88. These results not only fill a knowledge gap of Ag8GeSe6 but also contribute to a comprehensive understanding of 816 phase argyrodites at large.
资助项目National Natural Science Foundation of China[51772035] ; National Natural Science Foundation of China[11604032] ; National Natural Science Foundation of China[11674040] ; National Natural Science Foundation of China[51472036] ; National Natural Science Foundation of China[11874356] ; National Natural Science Foundation of China[51672270] ; Fundamental Research Funds for the Central Universities[2018 CDQYWL0048] ; Fundamental Research Funds for the Central Universities[2018CDPTCG0001/26] ; Fundamental Research Funds for the Central Universities[106112017CDJQJ308821] ; Fundamental Research Funds for the Central Universities[2018CDJDWL0011] ; Fundamental Research Funds for the Central Universities[2018CDYJSY0055] ; CSC scholarship[201806050180] ; Key Research Program of Frontiers Sciences, CAS[QYZDB-SSWSLH016] ; Project for Fundamental and Frontiers Research in Chongqing[CSTC2015JCYJBX0026] ; Project for Fundamental and Frontiers Research in Chongqing[CSTC2017jcyjAX0388]
WOS研究方向Science & Technology - Other Topics ; Materials Science
语种英语
WOS记录号WOS:000456351100047
出版者AMER CHEMICAL SOC
源URL[http://119.78.100.138/handle/2HOD01W0/7308]  
专题机器人与3D打印技术创新中心
通讯作者He, Jian; Zhou, Xiaoyuan
作者单位1.Chongqing Univ, Coll Phys, Chongqing Key Lab Soft Condensed Matter Phys & Sm, Chongqing 401331, Peoples R China
2.Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA
3.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100044, Peoples R China
5.Chun Yuan Christian Univ, Dept Phys, Taoyuan 32023, Taiwan
6.Chongqing Univ, Analyt & Testing Ctr, Chongqing 401331, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Xingchen,Yang, Chun-Chuen,Liu, Yamei,et al. High-Temperature Structural and Thermoelectric Study,of Argyrodite Ag8GeSe6[J]. ACS APPLIED MATERIALS & INTERFACES,2019,11(2):2168-2176.
APA Shen, Xingchen.,Yang, Chun-Chuen.,Liu, Yamei.,Wang, Guiwen.,Tan, Huan.,...&Zhou, Xiaoyuan.(2019).High-Temperature Structural and Thermoelectric Study,of Argyrodite Ag8GeSe6.ACS APPLIED MATERIALS & INTERFACES,11(2),2168-2176.
MLA Shen, Xingchen,et al."High-Temperature Structural and Thermoelectric Study,of Argyrodite Ag8GeSe6".ACS APPLIED MATERIALS & INTERFACES 11.2(2019):2168-2176.

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来源：重庆绿色智能技术研究院

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