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

研究成果: Article査読

抄録

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.

本文言語English
論文番号122990
ジャーナルMaterials Chemistry and Physics
249
DOI
出版ステータスPublished - 2020 7 15

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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