Effects of excess Te on the thermoelectric properties of p-type 25% Bi2Te3-75% Sb2Te3 single crystal and hot-pressed sinter
- Authors
- Hwang, CW; Hyun, DB; Ha, HP; Oh, TS
- Issue Date
- Jul-2001
- Publisher
- SPRINGER
- Citation
- JOURNAL OF MATERIALS SCIENCE, v.36, no.13, pp.3291 - 3297
- Journal Title
- JOURNAL OF MATERIALS SCIENCE
- Volume
- 36
- Number
- 13
- Start Page
- 3291
- End Page
- 3297
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/27204
- DOI
- 10.1023/A:1017959008268
- ISSN
- 0022-2461
- Abstract
- Effects of excess Te on the thermoelectric properties of p-type 25% Bi2Te3-75% Sb2Te3 single crystal and hot-pressed sinter were characterized and understood with the micro-phase diagram near the stoichiometric composition obtained by measuring the equilibrium Seebeck coefficient. Thermoelectric properties of the 25% Bi2Te3-75% Sb2Te3 single crystal were varied with the amount of excess Te, as delta -phase of the single crystal becomes less Te-deficient with adding more excess Te. However, thermoelectric properties of the hot-pressed sinter were not varied with the amount of excess Te, because the composition of delta -phase is not changed with the amount of excess Te. While a maximum figure-of-merit of 2.39 x 10(-3)/K at 300 K was obtained for the 25% Bi2Te3-75% Sb2Te3 single crystal by adding 6 wt % excess Te, the hot-pressed 25% Bi2Te3-75% Sb2Te3 sinter exhibited the figure-of-merit of 2.97 x 10(-3)/K regardless of the excess Te amount. (C) 2001 Kluwer Academic Publishers.
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Collections - College of Engineering > Materials Science and Engineering Major > 1. Journal Articles
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