The effect of microstructure on the thermoelectric properties of Bi2Te3-PbTe alloy
- The effect of microstructure on the thermoelectric properties of Bi2Te3-PbTe alloy
- 권오정; 박종로; 임주혁; 구현; 김재열; 유현우; 배성환; 김진상; 박찬
- Thermoelectricity; Bi2Te3; PbTe
- Issue Date
- Current applied physics
- VOL 11, NO 1, S242-S245
- 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.
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