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Thermoelectric and Mechanical Properties of Nano BaTiO3 Composited Cu1.8S Bulks
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School of Materials Science and Engineering,University of Science and Technology Beijing

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    Abstract:

    Digenite (Cu1.8S) as a potential p-type thermoelectric (TE) material has attracted extensive attention due to its environmental benign, abundant resources and low cost of component elements. In this study, the TE properties of Cu1.8S-x wt%BaTiO3 bulk samples prepared by mechanical alloying (MA) combined with spark plasma sintering (SPS) were investigated. Adding BaTiO3 would refine grains, thereby increasing the phonons scattering and reducing the thermal conductivity k. The k for Cu1.8S-0.2 wt%BaTiO3 is 2.2 W m-1 K-1 which is 18% lower than that for pristine Cu1.8S (2.69 W m-1 K-1). The refined grains also enhance the carriers scattering, and reduce the carrier mobility to reduce the power factor (PF). Combine with the decreased PF and k, the calculated ZT values are barely unchanged for adding BaTiO3 in Cu1.8S. The Vickers-hardness for BaTiO3-adding samples are improved due to the refined grains and the pinning effect of BaTiO3 on grain boundary. This study shows that the mechanical properties of Cu1.8S bulk samples can be effectively improved by compositing nano BaTiO3 with little affecting TE properties, which provides ideas for preparing high mechanical properties and durable TE devices of Cu-S system.

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[Zhao Zhao, Liang Doudou, Wu Yin, Zhang Rui, Shi Jianlei, Zhao Yinghao, Shan Zhihang, Zhou Wei, Zhang Boping. Thermoelectric and Mechanical Properties of Nano BaTiO3 Composited Cu1.8S Bulks[J]. Rare Metal Materials and Engineering,2022,51(3):1081~1086.]
DOI:10.12442/j. issn.1002-185X.20210236

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History
  • Received:March 20,2021
  • Revised:August 05,2021
  • Adopted:September 01,2021
  • Online: April 06,2022
  • Published: March 30,2022