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

Sang Seok Kim, Tatsuhiko Aizawa

Research output: Contribution to journalArticle

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
Publication statusPublished - 2006 Aug
Externally publishedYes

Fingerprint

Extrusion
shear
Electric conductivity
Mechanical alloying
Electron diffraction
Bending strength
Diffraction patterns
Textures
flexural strength
figure of merit
alloying
diffraction patterns
textures
electron diffraction
electrical resistivity

Keywords

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

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Thermoelectric properties for P-type (Bi2Te3) 0.2(Sb2Te3)0.8 alloys fabricated by shear extrusion. / Kim, Sang Seok; Aizawa, Tatsuhiko.

In: Metals and Materials International, Vol. 12, No. 4, 08.2006, p. 317-322.

Research output: Contribution to journalArticle

@article{a46a4d643a3f4619a2991a4ecbf29ac0,
title = "Thermoelectric properties for P-type (Bi2Te3) 0.2(Sb2Te3)0.8 alloys fabricated by shear extrusion",
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.",
keywords = "Anisotropy, Crystallographic orientation, Electron backscattered diffraction patterns (EBSP), P-type, Shear extrusion",
author = "Kim, {Sang Seok} and Tatsuhiko Aizawa",
year = "2006",
month = "8",
language = "English",
volume = "12",
pages = "317--322",
journal = "Metals and Materials International",
issn = "1598-9623",
publisher = "Korean Institute of Metals and Materials",
number = "4",

}

TY - JOUR

T1 - Thermoelectric properties for P-type (Bi2Te3) 0.2(Sb2Te3)0.8 alloys fabricated by shear extrusion

AU - Kim, Sang Seok

AU - Aizawa, Tatsuhiko

PY - 2006/8

Y1 - 2006/8

N2 - 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.

AB - 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.

KW - Anisotropy

KW - Crystallographic orientation

KW - Electron backscattered diffraction patterns (EBSP)

KW - P-type

KW - Shear extrusion

UR - http://www.scopus.com/inward/record.url?scp=33751053218&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33751053218&partnerID=8YFLogxK

M3 - Article

VL - 12

SP - 317

EP - 322

JO - Metals and Materials International

JF - Metals and Materials International

SN - 1598-9623

IS - 4

ER -