Temperature and composition insensitivity of thermoelectric properties of high-entropy half-heusler compounds
Abstract
Composition modification by doping and solid solution is a well-studied strategy in thermoelectric (TE) materials to optimize their properties. Recently, the concept of entropy stabilization has offered the possibility of forming random solid solutions that have properties that go beyond the rule of mixture. In this study, we prepared a series of high-entropy half-Heusler solid solutions (HEHHs) with varying valence electron counts (VEC), (Ti0.33Zr0.33Hf0.33)1-x(V0.33Nb0.33Ta0.33)xCoSb (x = 0.5 to 0.75). Compared to their medium- and low-entropy counterparts, the TE properties of HEHHs are less sensitive to temperature and composition variation (charge carrier concentration efficiency of ∼10 %). An ultra-low lattice thermal conductivity for half-Heusler of 1.19 W·m−1·K−1 was achieved.
Citation
Li , S , Chen , K , Wang , Y , Saunders , T , Zhang , R , Bos , J-W G & Reece , M J 2024 , ' Temperature and composition insensitivity of thermoelectric properties of high-entropy half-heusler compounds ' , Acta Materialia , vol. 268 , 119761 . https://doi.org/10.1016/j.actamat.2024.119761
Publication
Acta Materialia
Status
Peer reviewed
ISSN
1359-6454Type
Journal article
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