Thermoelectric properties of rapid hot pressed polycrystalline Ag1âxPb18SbTe20synthesized from doping PbTe nanocrystals
✍ Scribed by Xin, Xingliang ;Jiang, Yang ;Kong, Daxing ;Zhong, Honghai ;Chen, Lei ;Yu, Dabin
- Book ID
- 105365454
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 542 KB
- Volume
- 207
- Category
- Article
- ISSN
- 0031-8965
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✦ Synopsis
Abstract
Polycrystalline thermoelectric (TE) materials of n‐type and with compositions of Ag~1−x~Pb~18~SbTe~20~ (x = 0, 0.1, 0.2) were prepared by rapid hot pressing from alloy powders, which were obtained by ball milling crystalline ingots. The ingots were synthesized from PbTe nanoparticles, made by solvothermal reactions, and Ag, Sb and Te powders via vacuum‐sealed melting in quartz ampoules. Through rapid hot pressing at 748 K for 15 min under 80 MPa, the polycrystalline samples possessed 95% relative densities with the average grain size of 5 µm. The electrical resistivity, Seebeck coefficient and thermal conductivity of the Ag~1−x~Pb~18~SbTe~20~ (x = 0, 0.1, 0.2) samples were measured in the range from room temperature (RT) to 673 K. The thermal conductivity was dramatically decreased, caused by scattering of phonons from grain boundaries and interfaces. By optimizing the values of carrier concentration and carrier transference, the Ag~1−x~Pb~18~SbTe~20~ (x = 0.2) sample achieved a maximum ZT value of 1.019 at 673 K.