Crowding-out effect strategy using AgCl for realizing a super low lattice thermal conductivity of SnTe

Wang, Lijun and Hong, Min and Kawami, Youichirou and Sun, Qiang and Nguyen, Van Thuong and Wang, Yuan and Yue, Luo and Zheng, Shuqi and Zhu, Zhonghua and Zou, Jin and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2020) Crowding-out effect strategy using AgCl for realizing a super low lattice thermal conductivity of SnTe. Sustainable Materials and Technologies, 25:e00183. pp. 1-7. ISSN 2214-9929


Abstract

Recent studies have shown that SnTe is an attractive thermoelectric material, particularly after band engineering and/or all-scale hierarchical architecturing. In this study, SnTe microcrystals have been firstly synthesized by using a microwave-stimulated wet-chemical method, and then mixed with AgCl for spark plasma sintering. The crowding-out of AgCl induces all length scale hierarchical structures in the sintered SnTe-AgCl pellets, which include the point defects, dislocations, nanopores, and grain boundaries. Such hierarchical structures suppress the transport of phonons and result in a super-low lattice thermal conductivity of ~0.31 Wm−1 K−1 at 775 K in (SnTe)0.95(AgCl)0.05. Moreover, the decomposed AgCl induces cation doping to improve the electrical transport properties of the sintered pellets. Thus, a maximum figure of merit, ZT of ~0.51 at 773 K can be obtained with a composition of (SnTe)0.95(AgCl)0.05, which is 55% higher than that of the pristine SnTe. Our strategy enables to further increase the thermoelectric properties of thermoelectric materials.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 21 Jan 2021 05:39
Last Modified: 29 Jan 2021 04:41
Uncontrolled Keywords: Microwave-assisted solvothermal method; Crowding-out effect; All length scale hierarchical structure; Thermoelectric materials
Fields of Research (2008): 02 Physical Sciences > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
51 PHYSICAL SCIENCES > 5104 Condensed matter physics > 510404 Electronic and magnetic properties of condensed matter; superconductivity
Funding Details:
Identification Number or DOI: https://doi.org/10.1016/j.susmat.2020.e00183
URI: http://eprints.usq.edu.au/id/eprint/40560

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