The effect of microstructure on the thermoelectric properties of Bi2Te3-PbTe alloy

Title
The effect of microstructure on the thermoelectric properties of Bi2Te3-PbTe alloy
Authors
권오정박종로임주혁구현김재열유현우배성환김진상박찬
Keywords
Thermoelectricity; Bi2Te3; PbTe
Issue Date
2011-03
Publisher
Current applied physics
Citation
VOL 11, NO 1, S242-S245
Abstract
The microstructures and the thermoelectric properties of the polycrystalline Bi2Te3-PbTe alloy, which was prepared by spark plasma sintering were investigated. The polycrystalline alloy consists of Bi rich and Pb rich regions with several nm sizes, which were identified by transmission electron microscope (TEM) and energy dispersive spectrometer (EDS). The highest power factor, S2ρ-1, and ZT value of the polycrystalline alloy were 4.30 x 10-4Wm-1K-2 and ~0.39 at 473 K respectively, and the lowest thermal conductivity was ~0.5W/mK at same temperature. The relatively low thermal conductivity of polycrystalline Bi2Te3-PbTe alloy is caused by the increase of grain boundary and interfaces between the Bi-rich and the Pb-rich regions.
URI
http://pubs.kist.re.kr/handle/201004/39567
ISSN
1567-1739
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KIST Publication > Article
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