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Discovery of (Sc,V)CoSb double half-Heusler alloys with low lattice thermal conductivity
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DOI：10.1016/j.jallcom.2024.178078.png)
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Abstract
En 中文
Ternary half-Heusler compounds are well-recognized for their superior thermoelectric properties across mid- to high-temperature ranges, while their high lattice thermal conductivity limits energy conversion efficiency and broader applications in thermoelectric devices. In contrast, quaternary double half-Heusler alloys, noted for their inherently low lattice thermal conductivity, show considerable research potential but remain underexplored. In this work, a new (Sc,V)CoSb-based double half-Heusler alloy is successfully synthesized by combining 17-electron ScCoSb with 19-electron VCoSb through mechanical alloying and spark plasma sintering. By precisely adjusting the Sc/V ratio, both p- and n-type materials are achieved. Ni-doping synergistically optimizes electron concentrations, enhances power factors, and increases phonon scattering, thereby effectively improving the thermoelectric properties of n-type samples. Additionally, alloying Ta at the V sites further reduces lattice thermal conductivity through enhanced point defect scattering. This strategy achieves maximum zT values of 0.51 for p-type and 0.66 for n-type materials at 923 K, both based on the same parent compound, with their room-temperature lattice thermal conductivities of 2.2 and 2.4 W m- 1 K-1, respectively, indicating significant potential for thermoelectric applications.
Keywords:
Thermoelectrics
(Sc
V)CoSb
Double half-Heusler alloys
Lattice thermal conductivity
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6.3
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8.2W
Citations:
24.3W
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