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Thermoelectric properties of Bi0.5Sb1.5Te3/Ag2Te bulk composites with size- and shape-controlled Ag2Te nano-particles dispersion

Title
Thermoelectric properties of Bi0.5Sb1.5Te3/Ag2Te bulk composites with size- and shape-controlled Ag2Te nano-particles dispersion
Author
좌용호
Keywords
Thermoelectric; Nano particle dispersion; Composite; Ag2Te; TOPOLOGICAL INSULATOR; PERFORMANCE; TELLURIDE; PHASE
Issue Date
2016-02
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v. 657, Page. 639-645
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.
URI
https://www.sciencedirect.com/science/article/pii/S092583881531416Xhttp://hdl.handle.net/20.500.11754/49773
ISSN
0925-8388; 1873-4669
DOI
10.1016/j.jallcom.2015.10.160
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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