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We report on a study of bulk SiGe-MnTe composites obtained via spark plasma sintering of mixed powders
composed of SiGe that was fabricated by mechanical alloying and MnTe prepared via solid-state reaction. The presence of MnTe in the SiGe matrix led to an increase in the electrical conductivity by ~ 50 % and a decrease in the lattice thermal conductivity of the samples by ~ 28 %, while the Seebeck coefficient was reduced from 252 μV K-1 to 197 μV K-1 at 1000 K. As a result, the peak zT of 0.75 was obtained for pristine Si80Ge20B2, and 0.8 for Si80Ge20B2 + 4 wt% MnTe at 1000 K.

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• In Copyright
  

Keyword: thermoelectric

Date published: 2023-12-15

Publisher: Elsevier BV

Journal:

• Materials Letters (ISSN: 0167577X) vol. 357 135746

Funding:

• Japan Science and Technology Agency
• Russian Science Foundation 21-12-00405
• JST-Mirai Program JPMJMI19A1

Manuscript type: Author's original (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4819

First published URL: https://doi.org/10.1016/j.matlet.2023.135746

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Updated at: 2024-10-10 08:30:09 +0900

Published on MDR: 2024-10-10 08:30:10 +0900