Enhancement of thermoelectric figure-of-merit at low temperatures by titanium substitution for hafnium in n-type half-Heuslers Hf0.75-xTixZr0.25NiSn0.99Sb0.01

Joshi, Giri; Dahal, Tulashi; Chen, Shuo; Wang, Hengzhi Z; Shiomi, Junichiro; Chen, Gang; Ren, Zhifeng F.

doi:10.1016/j.nanoen.2012.07.020

Title: Enhancement of thermoelectric figure-of-merit at low temperatures by titanium substitution for hafnium in n-type half-Heuslers Hf0.75-xTixZr0.25NiSn0.99Sb0.01

Journal Article · Wed Aug 08 00:00:00 EDT 2012 · Nano Energy

DOI:https://doi.org/10.1016/j.nanoen.2012.07.020· OSTI ID:1105287

Joshi, Giri ^[1]; Dahal, Tulashi ^[1]; Chen, Shuo ^[1]; Wang, Hengzhi Z ^[1]; Shiomi, Junichiro ^[2]; Chen, Gang ^[3]; Ren, Zhifeng F. ^[1]

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

The effect of titanium (Ti) substitution for hafnium (Hf) on thermoelectric properties of (Hf, Zr)-based n-type half-Heuslers: Hf_0.75-xTi_xZr_0.25NiSn_0.99Sb_0.01, has been studied. The samples are made by arc melting followed by ball milling and hot pressing via the nanostructuring approach. A peak thermoelectric figure-of-merit (ZT) of ~1.0 is achieved at 500 °C in samples with a composition of Hf_0.5Zr_0.25Ti_0.25NiSn_0.99Sb_0.01 due to a slight increase in carrier concentration and also a lower thermal conductivity caused by Ti. TheZT values below 500 °C of hot pressed Hf_0.5Zr_0.25Ti_0.25NiSn_0.99Sb_0.01 samples are significantly higher than those of the same way prepared Hf_0.75Zr_0.25NiSn_0.99Sb_0.01samples at each temperature, which are very much desired for mid-range temperature applications such as waste heat recovery in automobiles.

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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)

DOE Contract Number:: SC0001299; FG02-09ER46577

OSTI ID:: 1105287

Journal Information:: Nano Energy, Vol. 2, Issue 1; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; ISSN 2211-2855

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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Title: Enhancement of thermoelectric figure-of-merit at low temperatures by titanium substitution for hafnium in n-type half-Heuslers Hf0.75-xTixZr0.25NiSn0.99Sb0.01

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