Thermoelectric properties of Bi0.5Sb1.5Te3/Ag2Te bulk composites with size- and shape-controlled Ag2Te nano-particles dispersion
- Authors
- Lee, Min Ho; Rhyee, Jong-Soo; Kim, Seil; Choa, Yong-Ho
- Issue Date
- Feb-2016
- Publisher
- Elsevier BV
- Keywords
- Thermoelectric; Nano particle dispersion; Composite; Ag2Te
- Citation
- Journal of Alloys and Compounds, v.657, pp.639 - 645
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Alloys and Compounds
- Volume
- 657
- Start Page
- 639
- End Page
- 645
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/14529
- DOI
- 10.1016/j.jallcom.2015.10.160
- ISSN
- 0925-8388
- Abstract
- We investigated the particle size-dependent thermoelectric properties of conventional p-type Bi0.5Sb1.5Te3 compounds (L-large, M-medium, S-small sizes) and M-Bi0.5Sb1.5Te3/Ag2Te composites with commercial (C), nano-wire (NW), and nano-powder (NP) type Ag2Te nano materials. The sintered ingot with the medium size particles M-Bi0.5Sb1.5Te3 shows a high power factor of S-2 sigma, due to its high electrical conductivity and Seebeck coefficient, with a maximum ZT (0.9 at 300 K). The S-Bi0.5Sb1.5Te3, synthesized by the wet-chemical method, exhibits the lowest thermal conductivity by grain boundary phonon scattering. The composites of M-Bi0.5Sb1.5Te3/Ag2Te show significantly enhanced electrical conductivities, as well as a decrease of lattice thermal conductivities, resulting in the enhancement of ZT (1.1 at 575 K) for a NP-Ag2Te dispersed M-Bi0.5Sb1.5Te3/NP-Ag2Te composite. Here, we propose that the Bi0.5Sb1.5Te3/Ag2Te composite can be employed as a material for waste heat power generation. (C) 2015 Elsevier B.V. All rights reserved.
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