Stronger phonon scattering by larger differences in atomic mass and size in p-type half-Heuslers Hf1-xTixCoSb0.8Sn0.2

Yan, Xiao; Liu, Weishu; Wang, Hui; Chen, Shuo; Shiomi, Junichiro; Esfarjani, Keivan; Wang, Hengzhi; Wang, Dezhi; Chen, Gang; Ren, Zhifeng

doi:10.1039/c2ee21554c

Title: Stronger phonon scattering by larger differences in atomic mass and size in p-type half-Heuslers Hf_1-xTi_xCoSb_0.8Sn_0.2

Journal Article · Mon Apr 23 00:00:00 EDT 2012 · Energy & Environmental Science

DOI:https://doi.org/10.1039/c2ee21554c· OSTI ID:1386945

Yan, Xiao ^[1]; Liu, Weishu ^[1]; Wang, Hui ^[1]; Chen, Shuo ^[1]; Shiomi, Junichiro ^[2]; Esfarjani, Keivan ^[3]; Wang, Hengzhi ^[1]; Wang, Dezhi ^[1]; Chen, Gang ^[3]; Ren, Zhifeng ^[1]

Boston College, Chestnut Hill, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Tokyo (Japan)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

We report that high lattice thermal conductivity has been the bottleneck for further improvement of the thermoelectric figure-of-merit (ZT) of half-Heuslers (HHs) Hf_1-xZr_xCoSb_0.8Sn_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_1-xTi_xCoSb_0.8Sn_0.2, due to larger differences in the atomic mass and size between Hf and Ti compared with Hf and Zr. Finally, the highest ZT peak, ~1.0 at 800 °C, in the Hf_1-xTi_xCoSb_0.8Sn_0.2 (x = 0.1, 0.2, 0.3, and 0.5) system was achieved using Hf_0.8Ti_0.2CoSb_0.8Sn_0.2, which makes this material useful in power generation applications.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001299; FG02-09ER46577; FG02-00ER45805

OSTI ID:: 1386945

Journal Information:: Energy & Environmental Science, Vol. 5, Issue 6; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 218 works

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Title: Stronger phonon scattering by larger differences in atomic mass and size in p-type half-Heuslers Hf1-xTixCoSb0.8Sn0.2

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Title: Stronger phonon scattering by larger differences in atomic mass and size in p-type half-Heuslers Hf_1-xTi_xCoSb_0.8Sn_0.2