Stronger phonon scattering by larger differences in atomic mass and size in p-type half-Heuslers Hf[subscript 1−x]Ti[subscript x]CoSb[subscript 0.8]Sn[subscript 0.2]
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Author(s)
Yan, Xiao
Liu, Weishu
Wang, Hui
Chen, Shuo
Shiomi, Junichiro
Esfarjani, Keivan
Wang, Hengzhi
Wang, Dezhi
Chen, Gang
Ren, Zhifeng
Date Issued
April 2012
Journal
Energy & Environmental Science
Publisher
Royal Society of Chemistry
Citation
Yan, Xiao, Weishu Liu, Hui Wang, Shuo Chen, Junichiro Shiomi, Keivan Esfarjani, Hengzhi Wang, Dezhi Wang, Gang Chen, and Zhifeng Ren. “Stronger Phonon Scattering by Larger Differences in Atomic Mass and Size in p-Type Half-Heuslers Hf1−xTixCoSb0.8Sn0.2.” Energy & Environmental Science 5, no. 6 (2012): 7543.
Version
Author's final manuscript
Abstract
High lattice thermal conductivity has been the bottleneck for further improvement of the thermoelectric figure-of-merit (ZT) of half-Heuslers (HHs) Hf[subscript 1−x]Zr[subscript x]CoSb[subscript 0.8]Sn[subscript 0.2]. Theoretically, the lattice thermal conductivity can be reduced by exploring larger differences in the atomic mass and size in the crystal structure, leading to higher ZT. In this paper, we experimentally demonstrated that a lower thermal conductivity in p-type half-Heuslers can be achieved when Ti is used to replace Zr, i.e., Hf[subscript 1−x]Ti[subscript x]CoSb[subscript 0.8]Sn[subscript 0.2], due to larger differences in the atomic mass and size between Hf and Ti compared with Hf and Zr. The highest ZT peak, ~1.0 at 800 °C, in the Hf[subscript 1−x]Ti[subscript x]CoSb[subscript 0.8]Sn[subscript 0.2] (x = 0.1, 0.2, 0.3, and 0.5) system was achieved using Hf[subscript 0.8]Ti[subscript 0.2]CoSb[subscript 0.8]Sn[subscript 0.2], which makes this material useful in power generation applications.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1039/c2ee21554c
