Enhancement of thermoelectric figure-of-merit at low temperatures by titanium substitution for hafnium in n-type half-Heuslers Hf[subscript0.75−x]Ti[subscript x]Zr[subscript 0.25]NiSn[subscript 0.99]Sb[subscript 0.01]
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Paper9_G. Joshi_Nano Energy.pdf
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Author(s)
Joshi, Giri
Dahal, Tulashi
Chen, Shuo
Wang, Hengzhi
Shiomi, Junichiro
Chen, Gang
Ren, Zhifeng
Alternative 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
Date Issued
August 2012
Journal
Nano Energy
Publisher
Elsevier
Citation
Joshi, Giri et al. “Enhancement of Thermoelectric Figure-of-Merit at Low Temperatures by Titanium Substitution for Hafnium in N-Type Half-Heuslers Hf[subscript 0.75−x]Ti[subscript x]Zr[subscript 0.25]NiSn[subscript 0.99]Sb[subscript 0.01].” Nano Energy 2.1 (2013): 82–87.
Version
Author's final manuscript
Abstract
The effect of titanium (Ti) substitution for hafnium (Hf) on thermoelectric properties of (Hf, Zr)-based n-type half-Heuslers: Hf[subscript 0.75−x]Ti[subscript x]Zr[subscript 0.25]NiSn[subscript 0.99]Sb[subscript 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[subscript 0.5]Zr[subscript 0.25]Ti[subscript 0.25]NiSn[subscript 0.99]Sb[subscript 0.01] due to a slight increase in carrier concentration and also a lower thermal conductivity caused by Ti. The ZT values below 500 °C of hot pressed Hf[subscript 0.5]Zr[subscript 0.25]Ti[subscript 0.25]NiSn[subscript 0.99]Sb[subscript 0.01] samples are significantly higher than those of the same way prepared Hf[subscript 0.75]Zr[subscript 0.25]NiSn[subscript 0.99]Sb[subscript 0.01] samples at each temperature, which are very much desired for mid-range temperature applications such as waste heat recovery in automobiles.
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.2012.07.020
