Cristallographic anisotropy control of n-type Bi-Te-Se thermoelectric materials via bulk mechanical alloying and shear extrusion

Sang Seok Kim, Tatsuhiko Aizawa

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The shear extrusion processing combined with bulk mechanical alloying is proposed to yield the n-type Bi-Te-Se material from elemental granules. It has well-developed texture so as to improve the electric conductivity and thermoelectric properties. The shear extrusion processing of (Bi 2Se3)0.05(Bi2Te3) 0.95 alloy green compact can afford the preferred orientation factor of anisotropic crystallographic structure: F = 0.67. The electric resistivity of (Bi2Se3)0.05(Bi2Te 3)0.95 is controlled to be 0.491 × 10-5 (Ωm), which is 0.2 times lower than that of hot-pressed specimen. Maximum power factor is achieved to be 3.31 × 10-3 (W/mK2) even without any dopants. The bending strength of the material produced in this work is also improved to be 166 MPa, 1.7 times higher than that of conventional hot-extruded specimens.

Original languageEnglish
Pages (from-to)918-924
Number of pages7
JournalMaterials Transactions
Volume45
Issue number3
DOIs
Publication statusPublished - 2004 Mar

Keywords

  • Anisotropy
  • Bismuth telluride
  • Orientation factor
  • Shear extrusion processing
  • Thermoelectric properties
  • n-type thermoelectric materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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