Microstructure and thermoelectric properties of higher manganese silicides fabricated via gas atomization and spark plasma sintering

Lei Liu, Hiraku Oda, Tetsuhiko Onda, Noriharu Yodoshi, Takeshi Wada, Zhong Chun Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Higher manganese silicides (HMS) powders were successfully prepared by a gas atomization technique. The gas atomized (GAed) powders showed spherical morphologies and a wide particle size distribution. No MnSi and Si phases were detected by XRD analyses, indicating that the high cooling rate during rapid solidification is effective in inhibiting the formation of second phases. When the GAed powders were consolidated by spark plasma sintering (SPS), the densified samples revealed almost the same phase composition as the powders and an isotropic feature. The contrast differences between different grains in backscattered electron images are believed to be associated with orientation differences. The HMS samples SPSed at different temperatures exhibited similar values of the Seebeck coefficient, but larger electrical conductivity and power factor were obtained in the sample SPSed at 1000 °C. Moreover, the HMS samples showed higher fracture toughness compared to those fabricated by a solid-state reaction and SPS process.

Original languageEnglish
Article number122990
JournalMaterials Chemistry and Physics
Volume249
DOIs
Publication statusPublished - 2020 Jul 15

Keywords

  • Gas atomization
  • Higher manganese silicides
  • Microstructure
  • Spark plasma sintering
  • Thermoelectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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