Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion

S. S. Kim, S. Yamamoto, T. Aizawa

研究成果: Article

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Shear extrusion processing with combination of bulk mechanical alloying is proposed to yield the p-type Bi-Te-Sb materials from elemental granules. It has a well-developed texture so as to improve the electrical conductivity and thermoelectric properties. The shear extrusion processing in the Bi 0.4Sb1.6Te3 and Bi0.5Sb 1.5Te3 alloy green compact improves the preferred orientation factor of anisotropic crystallographic structure: F = 0.63 for Bi0.4Sb1.6Te3 and F = 0.49 for Bi 0.5Sb1.5Te3, respectively. The electrical resistivity of Bi0.4Sb1.6Te3 is well-controlled to be 0.989×10-5Ωm, which is one-half of the hot-pressed specimen. Maximum power factor of Bi0.4Sb1.6Te 3 is achieved to 4.33×10-3W/mK2. The bending strength of the material produced is also improved to be 120MPa, six times larger than that for the zone-melt specimen.

元の言語English
ページ(範囲)107-113
ページ数7
ジャーナルJournal of Alloys and Compounds
375
発行部数1-2
DOI
出版物ステータスPublished - 2004 7 28

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ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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