Thermoelectric properties for P-type (Bi2Te3) 0.2(Sb2Te3)0.8 alloys fabricated by shear extrusion

Sang Seok Kim, Tatsuhiko Aizawa

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10 Citations (Scopus)

Abstract

P-type (Bi2Te3)0.2(Sb2Te 3)0.8 compounds were synthesized via bulk mechanical alloying (BMA), and subsequently prepared by a shear extrusion process in order to create the developed texture. The shear extrusion process improved the preferred orientation factor of the anisotropic crystallographic structure. It was found by an electron backscattered diffraction pattern (EBSP) analysis that approximately 90 % of the crystallographic orientations for shear-extruded sample are aligned in the range deviated from 60° to 90° from the c-axis. The electric resistivity is well controlled at 1.008 × 10 -5Ωm, which is nearly equal to that of the unidirectionally grown sample. The maximum figure of merit for the (Bi2Te 3)0.2(Sb2Te3)0.8 alloy was found to be z = 3.03 × 10-3 K-1. The bending strength of the material produced is also improved to 120 MPa, six times larger than that of the unidirectionally grown sample.

Original languageEnglish
Pages (from-to)317-322
Number of pages6
JournalMetals and Materials International
Volume12
Issue number4
DOIs
Publication statusPublished - 2006 Aug

Keywords

  • Anisotropy
  • Crystallographic orientation
  • Electron backscattered diffraction patterns (EBSP)
  • P-type
  • Shear extrusion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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