| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1607371 | Journal of Alloys and Compounds | 2016 | 7 Pages |
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 S2Ï, due to its high electrical conductivity and Seebeck coefficient, with a maximum ZT (0.9 at 300Â 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 575Â 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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Min Ho Lee, Jong-Soo Rhyee, Seil Kim, Yong-Ho Choa,