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

Sadeq Hooshmand Zaferani, Alireza Darebaghi, Soon-Jik Hong, Daryoosh Vashaee and Reza Ghomashchi
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Sadeq Hooshmand Zaferani: School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
Alireza Darebaghi: School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
Soon-Jik Hong: Division of Advanced Materials Engineering, Kongju National University, Chungnam 331-717, Korea
Daryoosh Vashaee: Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27606, USA
Reza Ghomashchi: School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia

Energies, 2020, vol. 13, issue 6, 1-11

Abstract: 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 SnV 3 , Co 2 Sn, and Co 3 V. 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.

Keywords: half-Heusler; CoVSn; thermoelectric; heterogeneous structure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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