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Open AccessArticle

Experimental Realization of Heavily p-doped Half-Heusler CoVSn Compound

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School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
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Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27606, USA
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Division of Advanced Materials Engineering, Kongju National University, Chungnam 331-717, Korea
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Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27606, USA
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ARC Research Hub for Graphene Enabled Industry Transformation, University of Adelaide, Adelaide, SA 5005, Australia
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Institute For Photonics And Advanced Sensing, University of Adelaide, Adelaide, SA 5005, Australia
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Authors to whom correspondence should be addressed.
Energies 2020, 13(6), 1459; https://doi.org/10.3390/en13061459
Received: 24 February 2020 / Revised: 17 March 2020 / Accepted: 19 March 2020 / Published: 20 March 2020
(This article belongs to the Section Advanced Energy Materials)
Hypothetical half-Heusler (HH) ternary alloy of CoVSn has already been computationally investigated for possible spintronics and thermoelectric applications. We report the experimental realization of this compound and the characterizations of its thermoelectric properties. The material was synthesized by a solid-state reaction of the stoichiometric amounts of the elements via powder metallurgy (30 h mechanical milling and annealing at 900 °C for 20 h) and spark plasma sintering (SPS). The temperature-dependent ternary thermodynamic phase diagram of Co-V-Sn was further calculated. The phase diagram and detailed analysis of the synthesized material revealed the formation of the non-stoichiometry HH CoVSn, mixed with the binary intermetallic phases of SnV3, Co2Sn, and Co3V. The combination of X-ray diffraction, energy-dispersive X-ray spectroscopy, and thermoelectric transport properties confirmed the formation of a multi-phase compound. The analysis revealed the predicted thermoelectric features (zT = 0.53) of the highly doped CoVSn to be compromised by the formation of intermetallic phases (zT ≈ 0.007) during synthesis. The additional phases changed the properties from p- to overall n-type thermoelectric characteristics. View Full-Text
Keywords: half-Heusler; CoVSn; thermoelectric; heterogeneous structure half-Heusler; CoVSn; thermoelectric; heterogeneous structure
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MDPI and ACS Style

Hooshmand Zaferani, S.; Darebaghi, A.; Hong, S.-J.; Vashaee, D.; Ghomashchi, R. Experimental Realization of Heavily p-doped Half-Heusler CoVSn Compound. Energies 2020, 13, 1459.

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