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

Sang Seok Kim, Tatsuhiko Aizawa

研究成果: Article査読

10 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)317-322
ページ数6
ジャーナルMetals and Materials International
12
4
DOI
出版ステータスPublished - 2006 8月
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学

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