Abstract
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/Bi0.5Sb1.5Te3 (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 xG/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 Bi2Te3-based TE materials with a simple process, low cost, and large potential in scale production.
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Hu, W., Zhou, H., Mu, X. et al. Preparation and Thermoelectric Properties of Graphite/Bi0.5Sb1.5Te3 Composites. J. Electron. Mater. 47, 3344–3349 (2018). https://doi.org/10.1007/s11664-017-5908-8
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DOI: https://doi.org/10.1007/s11664-017-5908-8