Preparation and Thermoelectric Properties of Graphite/Bi0.5Sb1.5Te3 Composites

Bismuth telluride zone-melting alloys are the most commercially used thermoelectric materials. However, the zone-melting ingots have weak machinability due to the strong preferred orientation. Here, non-textured graphite/Bi 0.5 Sb 1.5 Te 3 (G/BST) composites were prepared by a powder metallurgy meth...

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Bibliographic Details
Published in:Journal of electronic materials 2018-06, Vol.47 (6), p.3344-3349
Main Authors: Hu, Wenhua, Zhou, Hongyu, Mu, Xin, He, Danqi, Ji, Pengxia, Hou, Weikang, Wei, Ping, Zhu, Wanting, Nie, Xiaolei, Zhao, Wenyu
Format: Article
Language:English
Subjects:
Bismuth base alloys
Bismuth tellurides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold pressing
Composite materials
Electrical properties
Electrical resistivity
Electronics and Microelectronics
Graphite
Instrumentation
Intermetallic compounds
International Conference on Thermoelectrics 2017
Low cost
Machinability
Materials Science
Optical and Electronic Materials
Powder metallurgy
Preferred orientation
Solid State Physics
Tellurides
Thermal conductivity
Thermoelectric materials
Topical Collection: International Conference on Thermoelectrics 2017
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Summary:Bismuth telluride zone-melting alloys are the most commercially used thermoelectric materials. However, the zone-melting ingots have weak machinability due to the strong preferred orientation. Here, non-textured graphite/Bi 0.5 Sb 1.5 Te 3 (G/BST) composites were prepared by a powder metallurgy method combined with cold-pressing and annealing treatments. The composition, microstructure, and thermoelectric properties of the G/BST composites with different mass percentages of G were investigated. It was found that G addition could effectively reduce the thermal conductivity and slightly improve the electrical properties of the BST, which resulted in a large enhancement in the figure-of-merit, ZT . The largest ZT for the x G/BST composites with x  = 0.05% reached 1.05 at 320 K, which is increased by 35% as compared with that of the G-free BST materials. This work provided an effective method for preparing non-textured Bi 2 Te 3 -based TE materials with a simple process, low cost, and large potential in scale production.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-017-5908-8