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Thermoelectric Properties of P-Type (Bi1−xSbx)2Te3 Fabricated by Mechanical Alloying Process

Published online by Cambridge University Press:  15 February 2011

Boo Yang Jung ,
Jae Shik Choi ,
Tae Sung Oh  and
Dow-Bin Hyun
Boo Yang Jung
Affiliation:
Depart. of Metall. and Mater. Sci., Hong Ik Univ., Seoul, Korea, ohts@wow.hongik.ac.kr
Jae Shik Choi
Affiliation:
Depart. of Metall. and Mater. Sci., Hong Ik Univ., Seoul, Korea, ohts@wow.hongik.ac.kr
Tae Sung Oh
Affiliation:
Depart. of Metall. and Mater. Sci., Hong Ik Univ., Seoul, Korea, ohts@wow.hongik.ac.kr
Dow-Bin Hyun
Affiliation:
Metals Division, Korea Institute of Science and Technology, Seoul 136–791, Korea
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Abstract

Thermoelectric properties of polycrystalline (Bi1−xSbx)2Te3 (0.75 ≤ x ≤ 0.85), fabricated by mechanical alloying and hot pressing methods, have been investigated. Formation of (Bi0.25Sb0.75)2Te3 alloy powder was completed by mechanical alloying for 5 hours at ball- to-material ratio of 5: 1, and processing time for (Bi1−xSbx)2Te3 formation increased with Sb2Te3 content x. When (Bi0.25Sb0.75)2Te3 was hot pressed at temperatures ranging from 300°C to 550°C for 30 minutes, figure-of-merit increased with hot pressing temperature and maximum value of 2.8 × 10−3/K could be obtained by hot pressing at 550°C. When hot pressed at 550°C, (Bi0.2Sb0.8)2Te3 exhibited figure-of-merit of 2.92 × 10−3/K, which could be improved to 2.97 × 10−3/K with addition of 1 wt% Sb as acceptor dopant.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 478: Symposium Q – Thermoelectric Materials - New Directions and Approaches , 1997 , 121
Copyright
Copyright © Materials Research Society 1997

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