DOI: 10.1063/1.2809377. Thermoelectric properties of p-type Fe-doped TiCoSb half-Heusler compounds

Thermoelectric properties of p-type Fe-doped TiCoSb half-Heusler compounds

10.1063/1.2809377

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

TiFe x Co 1 − x Sb half-Heusler materials with randomly distributed TiO2 particles have been synthesized by arc melting and annealing. Thermoelectric properties were measured in the temperature range of ∼300–850 K. TiCoSb shows n-type conduction, while TiFexCo1−xSb transfers to p-type conduction when x≥0.01. The electrical conductivity of p-type TiFexCo1−xSb increased with increasing Fe content. The maximum Seebeck coefficient reached about 300 μV/K at 850 K for x=0.15. Since Fe powder contained a trace of Fe2O3, a small amount of TiO2 particles formed during the synthesis process. The lattice thermal conductivity dramatically decreased with increasing Fe content, which was mostly caused by the introduction of in situ formed TiO2 particles, as well as the effects of mass fluctuation and strain field fluctuation due to the substitution of Fe to the Co site. The dimensionless figure of merit (ZT=S2σT/κ) was significantly improved over the whole temperature region, and a maximum ZT value of 0.45 has been obtained for the composition of TiFe0.15Co0.85Sb at 850 K.

Bibliography

Wu, T., Jiang, W., Li, X., Zhou, Y., & Chen, L. (2007). Thermoelectric properties of p-type Fe-doped TiCoSb half-Heusler compounds. Journal of Applied Physics, 102(10).

Authors 5

Ting Wu (first)
Wan Jiang (additional)
Xiaoya Li (additional)
Yanfei Zhou (additional)
Lidong Chen (additional)

References 26 Referenced 120

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Dates

Type	When
Created	17 years, 9 months ago (Nov. 19, 2007, 6:15 p.m.)
Deposited	2 years, 2 months ago (July 5, 2023, 8:07 p.m.)
Indexed	1 day, 17 hours ago (Sept. 4, 2025, 10:11 a.m.)
Issued	17 years, 9 months ago (Nov. 15, 2007)
Published	17 years, 9 months ago (Nov. 15, 2007)
Published Online	17 years, 9 months ago (Nov. 19, 2007)
Published Print	17 years, 9 months ago (Nov. 15, 2007)

Funders 0

None

BibTeX

@article{Wu_2007, title={Thermoelectric properties of p-type Fe-doped TiCoSb half-Heusler compounds}, volume={102}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.2809377}, DOI={10.1063/1.2809377}, number={10}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Wu, Ting and Jiang, Wan and Li, Xiaoya and Zhou, Yanfei and Chen, Lidong}, year={2007}, month=nov }

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  "abstract": "<jats:p>TiFe x Co 1 \u2212 x Sb half-Heusler materials with randomly distributed TiO2 particles have been synthesized by arc melting and annealing. Thermoelectric properties were measured in the temperature range of \u223c300\u2013850\u2002K. TiCoSb shows n-type conduction, while TiFexCo1\u2212xSb transfers to p-type conduction when x\u22650.01. The electrical conductivity of p-type TiFexCo1\u2212xSb increased with increasing Fe content. The maximum Seebeck coefficient reached about 300\u2002\u03bcV/K at 850 K for x=0.15. Since Fe powder contained a trace of Fe2O3, a small amount of TiO2 particles formed during the synthesis process. The lattice thermal conductivity dramatically decreased with increasing Fe content, which was mostly caused by the introduction of in situ formed TiO2 particles, as well as the effects of mass fluctuation and strain field fluctuation due to the substitution of Fe to the Co site. The dimensionless figure of merit (ZT=S2\u03c3T/\u03ba) was significantly improved over the whole temperature region, and a maximum ZT value of 0.45 has been obtained for the composition of TiFe0.15Co0.85Sb at 850 K.</jats:p>",
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