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The Microstructure of Pbte-Bi2Te3 Alloys and Their Thermoelectric Properties

Title
The Microstructure of Pbte-Bi2Te3 Alloys and Their Thermoelectric Properties
Authors
Kim, HeeJinPark, Ji-eunHan, Mi-KyungKim, Sung-JinLee, Wooyoung
Ewha Authors
김성진한미경
SCOPUS Author ID
김성진scopus; 한미경scopus
Issue Date
2014
Journal Title
CHINESE JOURNAL OF PHYSICS
ISSN
0577-9073JCR Link
Citation
vol. 52, no. 1, pp. 239 - 250
Publisher
PHYSICAL SOC REPUBLIC CHINA
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
The (PbTe)(x)-(Bi2Te3)(100-x) alloy (x = 0, 3, 5, 7) samples were prepared by adding PbTe nanoparticles into a bulk Bi2Te3 matrix using typical solid state synthetic reactions. PbTe-Bi2Te3 alloy samples were studied by powder X-ray diffraction (PXRD), selected area electron diffraction (SAED), convergent beam electron diffraction (CBED), and energy dispersive spectroscopy (EDS). The results of the microstructural analysis showed that the PbTe-Bi2Te3 system contains three types of phase, a Bi2Te3 phase, a PbxBi2-xTe3 solid solution, and a PbBi2Te4 phase depending on the PbTe concentration. The PbxBi2-xTe3 solid solution in the Bi2Te3 matrix scatters not in electrons but phonons, thereby reducing the thermal conductivity. On the other hands, the PbBi2Te4 phase in the Bi2Te3 matrix scatters not only phonons but also electrons. As a result, the maximum values of 0.6 were obtained for the dimensionless figure of merit ZT for the (PbTe)(3)-(Bi2Te3)(97) alloy at room temperature values of 0.6 are obtained for the (PbTe)(3)-(Bi2Te3)(97) alloy at room temperature.
DOI
10.6122/CJP.52.239
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자연과학대학 > 화학·나노과학전공 > Journal papers
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