Thermoelectric properties of half-Heusler high-entropy Ti2NiCoSn1-xSb1+x (x = 0.5, 1) alloys with VEC>18. (September 2020)

• Record Type: Journal Article
• Authors: Karati, Anirudha; Hariharan, V.S.; Ghosh, Sanyukta; Prasad, Anil; Nagini, M.; Guruvidyathri, K.; Mallik, Ramesh Chandra; Shabadi, Rajashekhara; Bichler, Lukas; Murty, B.S.; Varadaraju, U.V.
• Is Part Of: Scripta materialia. Number 186(2020)
• Page Start: 375
• Page End: 380
• Publication Date: 2020-09
• Subjects: Heusler phases -- Intermetallic compounds -- Thermoelectric materials -- Spark plasma sintering -- Atom probe tomography; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.04.036
• Languages: English
• ISSNs: 1359-6462

Abstract

ABSTRACT: A new set of half-Heusler high-entropy alloys Ti2 NiCoSn1-x Sb1+ 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 −1 K −1, and a ZT of 0.29 at 873 K. Graphical abstract: Image, graphical abstract