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Thermoelectric properties of half-Heusler high-entropy Ti<inf>2</inf>NiCoSn<inf>1-x</inf>Sb<inf>1+</inf><inf>x</inf> (x = 0.5, 1) alloys with VEC>18
Date Issued
01-09-2020
Author(s)
Karati, Anirudha
Hariharan, V. S.
Ghosh, Sanyukta
Prasad, Anil
Nagini, M.
Guruvidyathri, K.
Mallik, Ramesh Chandra
Shabadi, Rajashekhara
Bichler, Lukas
Murty, B. S.
Indian Institute of Technology, Madras
Abstract
A new set of half-Heusler high-entropy alloys Ti2NiCoSn1-xSb1+x (x = 0.5, 1), with a valence electron count higher than 18, were investigated for thermoelectric applications. Vacuum arc melting was employed for synthesis. Atom probe analysis confirmed single-phase at atomic level. The alloys were subsequently ball milled for 1 h followed by spark plasma sintering for consolidation. In 1 h BM cases, the alloy with x = 0.5 exhibited a low lattice thermal conductivity of 2.48 Wm−1K−1, and a ZT of 0.29 at 873 K.
Volume
186