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]
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 a...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Elsevier
2017
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| Online Access: | http://hdl.handle.net/1721.1/108670 https://orcid.org/0000-0002-3968-8530 |
| Summary: | 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. |
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