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Issue 10, 2010
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Recrystallization induced in situnanostructures in bulk bismuthantimony tellurides: a simple top down route and improved thermoelectric properties

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Abstract

Recrystallization induced in situ nanostructure formation was used as a new means to obtain high performance polycrystalline thermoelectric materials, which was realized by a simple hot forging process to the coarse-grained Bi0.5Sb1.5Te3 alloys. The pole figure measurement showed that the oriented textures were weakened or eliminated after hot forging of the alloys with a quasi-layered crystal structure, implying the presence of deformation recrystallization. Transmission electron microscopy observation revealed the recrystallization induced in situ nanostructures and high density of defects in the hot forged samples. Transport property measurements indicated that the hot forged samples had both increased electrical power factor and reduced thermal conductivity, compare to the initial alloys without hot forging. The maximum ZT values of >1.3 at room temperature were reproducibly obtained for the hot forged samples, suggesting that the simple new method can be applied for large scale production of high performance polycrystalline thermoelectric materials with in situ nanostructures.

Graphical abstract: Recrystallization induced in situ nanostructures in bulk bismuth antimony tellurides: a simple top down route and improved thermoelectric properties

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Supplementary files

Article information


Submitted
02 Apr 2010
Accepted
25 May 2010
First published
12 Aug 2010

Energy Environ. Sci., 2010,3, 1519-1523
Article type
Paper

Recrystallization induced in situ nanostructures in bulk bismuth antimony tellurides: a simple top down route and improved thermoelectric properties

J. Shen, T. Zhu, X. Zhao, S. Zhang, S. Yang and Z. Yin, Energy Environ. Sci., 2010, 3, 1519
DOI: 10.1039/C0EE00012D

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