Suppression of grain growth by additive in nanostructured p-type bismuth antimony tellurides
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Paper2_Q. Zhang_Nano Energy.pdf
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Author(s)
Zhang, Qian
Zhang, Qinyong
Chen, Shuo
Liu, Weishu
Lukas, Kevin
Yan, Xiao
Wang, Hengzhi
Wang, Dezhi
Opeil, Cyril
Chen, Gang
Date Issued
November 2011
Journal
Nano Energy
Publisher
Elsevier
Citation
Zhang, Qian, Qinyong Zhang, Shuo Chen, Weishu Liu, Kevin Lukas, Xiao Yan, Hengzhi Wang, et al. “Suppression of Grain Growth by Additive in Nanostructured p-Type Bismuth Antimony Tellurides.” Nano Energy 1, no. 1 (January 2012): 183–189.
Version
Author's final manuscript
Abstract
Grain growth is a major issue in the preparation of nanostructured bismuth-antimony-tellurides during hot pressing the nanopowders into dense bulk samples. To prevent grain agglomeration during ball milling and growth during hot pressing, organic agent (Oleic Acid, OA) as additive was added into the materials at the beginning of the ball milling process. With different concentrations of OA (0.5, 1.0, 1.5, 2.0, and 2.5 wt%), grains with different sizes are obtained. Structural analysis clearly shows that it is the particle size of the nanopowders that determines the final grain size in the densely compacted bulk samples. A combination of small grains ∼200–500 nm and nanopores leads to effective phonon scattering, which results in the decrease of lattice thermal conductivity, and ZT of ∼1.3 at 373 K for the sample with 2.0 wt% OA.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1016/j.nanoen.2011.10.006
