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

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)107-113
Number of pages7
JournalJournal of Alloys and Compounds
Volume375
Issue number1-2
DOIs
Publication statusPublished - 2004 Jul 28

Keywords

  • Anisotropy
  • Bismuth telluride
  • Orientation factor
  • Shear extrusion processing

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Thermoelectric properties of anisotropy-controlled p-type Bi-Te-Sb system via bulk mechanical alloying and shear extrusion'. Together they form a unique fingerprint.

  • Cite this