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      Preparation and thermoelectric properties of Cu 1.8S/CuSbS 2 composites

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          Abstract

          Chalcostibite (CuSbS 2) is composed of earth-abundant elements and has a proper band gap ( E g = 1.05 eV) as a thermoelectric (TE) material. Herein, we report the TE properties in the CuSbS 2 based composites with a mole ratio of (1– x)CuSbS 2xCu 1.8S ( x = 0, 0.1, 0.2, 0.3), which were prepared by mechanical alloying (MA) combined with spark plasma sintering (SPS). X-ray diffraction (XRD) and back-scattered electron image (BSE) results indicate that a single phase of CuSbS 2 is synthesized at x = 0 and the samples consist of CuSbS 2, Cu 3SbS 4, and Cu 12Sb 4S 13 at 0.1 ⩽ x ⩽ 0.3. The correlation between the phase structure, microstructure, and TE transport properties of the bulk samples is established. The electrical conductivity increases from 0.14 to 50.66 S·cm −1 at 723 K and at 0 ⩽ x ⩽ 0.03, while the Seebeck coefficient holds an appropriate value of 190.51 μV·K −1. The highest ZT value of 0.17 is obtained at 723 K and at x = 0.3 owing to the combination of a high PF 183 μW·m −1·K −2 and a low κ 0.8 W·m −1·K −1.

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          Author and article information

          Journal
          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          2227-8508
          2226-4108
          01 June 2019
          01 October 2019
          : 8
          : 2
          : 209-217
          Affiliations
          aBeijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
          Author notes
          *Corresponding author: Boping ZHANG, E-mail: sendaimr@ 123456foxmail.com
          Article
          s40145-018-0306-0
          10.1007/s40145-018-0306-0
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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