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Thermoelectric Properties of Zr-Doped FeV0.64Hf0.16Ti0.2Sb Half-Heusler Alloys

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Abstract

Alloys of FeVSb and FeV0.64−xZrxHf0.16Ti0.2Sb half-Heusler materials have been prepared by successive arc melting and mechanical alloying (MA). FeVSb alloy was doped with V, Hf and Ti besides Zr that was used as dopant, replacing the positions of V atoms. Crystal structure and thermoelectric properties have been investigated before and after Zr doping. The crystal structure and morphology investigations have been successfully performed for all samples in this study. Transport and thermoelectric properties were investigated against temperature over a temperature range from 300 to 700 K. Electrical conductivity of the doped samples showed metallic-like behavior, while the FeV0.64Hf0.16Ti0.2Sb alloy exhibited a semiconducting trend. The parent FeVSb alloy exhibited n-type conduction. However, the sign has changed to a positive one after doping in the FeVSb lattice. Mass fluctuations followed by a disorder scattering were present. The room temperature Seebeck coefficient of FeVSb was recorded at 110 µV/K. The highest recorded power factor was obtained at 420 K for FeVSb at 1.07 mWm−1 K−2. Thermal conductivity of the parent alloy was reduced to a large extent upon Hf and Ti co-doping due to enhanced point defect scattering. However, Zr-doping at the expense of V led to a small increase in the thermal conductivity and thus a reduction in the power factor and the figure of merit. The maximum thermoelectric performance (zT) was observed at 0.27 for FeV0.64Hf0.16Ti0.2Sb at 700 K. The materials under this study can be used for high-temperature power generation applications. Due to their high power factor at room temperature, the studied materials are suitable for micro-thermoelectric generator applications for energy harvesting near room temperature.

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Acknowledgments

This work was supported by the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia [GRANT 3949]. Work at NUST MISIS was supported by Russian Science Foundation (grant No. 21-12-00405).

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Authors and Affiliations

  1. Department of Chemistry, College of Science, King Faisal University, 31982, Al-Ahsa, Saudi Arabia

    Hany M. Abd El-Lateef

  2. Chemistry Department, Faculty of Science, Sohag University, Sohag, 82524, Egypt

    Hany M. Abd El-Lateef

  3. Physics Department, Faculty of Science, Sohag University, Sohag, 82524, Egypt

    A. M. Adam, A. K. Diab & Mohamed Asran Hassan

  4. Faculty of Engineering, King Salman International University, Sinai, Egypt

    A. M. Adam

  5. National University of Science and Technology MISIS, Moscow, Russia, 119049

    Mohamed Asran Hassan & V. Khovaylo

  6. Physics Department, Faculty of Science, Damanhour University, Damanhour, 22516, Egypt

    E. M. Elsehly & A. El-Khouly

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  1. Hany M. Abd El-Lateef
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Correspondence to Hany M. Abd El-Lateef or A. M. Adam.

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El-Lateef, H.M.A., Adam, A.M., Diab, A.K. et al. Thermoelectric Properties of Zr-Doped FeV0.64Hf0.16Ti0.2Sb Half-Heusler Alloys. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08853-x

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