Title :

Ti2NiCoSnSb - a new half-Heusler type high-entropy alloy showing simultaneous increase in Seebeck coefficient and electrical conductivity for thermoelectric applications

Author(s) :

Karati, Anirudha [Auteur]
Indian Institute of Technology Madras [IIT Madras]
Nagini, M. [Auteur]
Indian Institute of Technology Madras [IIT Madras]
Ghosh, Sanyukta [Auteur]
Indian Institute of Science [Bangalore] [IISc Bangalore]
Shabadi, Rajashekhara [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Pradeep, K. G. [Auteur]
Indian Institute of Technology Madras [IIT Madras]
Mallik, Ramesh Chandra [Auteur]
Indian Institute of Science [Bangalore] [IISc Bangalore]
Murty, B. S. [Auteur]
Indian Institute of Technology Madras [IIT Madras]
Varadaraju, U. V. [Auteur]
Indian Institute of Technology Madras [IIT Madras]

Journal title :

Scientific Reports

Abbreviated title :

Sci Rep

Volume number :

9

Publisher :

Springer Science and Business Media LLC

Publication date :

2019-03-29

ISSN :

2045-2322

HAL domain(s) :

Chimie/Matériaux

English abstract : [en]

AbstractA new single phase high entropy alloy, Ti2NiCoSnSb with half-Heusler (HH) structure is synthesized for the first time by vacuum arc melting (VAM) followed by ball-milling (BM). The BM step is necessary to obtain ...
Show more >AbstractA new single phase high entropy alloy, Ti2NiCoSnSb with half-Heusler (HH) structure is synthesized for the first time by vacuum arc melting (VAM) followed by ball-milling (BM). The BM step is necessary to obtain the single phase. Local electrode atom probe (LEAP) analysis showed that the elements are homogeneously and randomly distributed in the HH phase without any clustering tendency. When the BM was carried out for 1 hour on the VAM alloy, microcrystalline alloy is obtained with traces of Sn as secondary phase. When BM was carried out for 5 h, single HH phase formation is realized in nanocrystalline form. However, when the BM samples were subjected to Spark plasma sintering (SPS), secondary phases were formed by the decomposition of primary phase. Nanostructuring leads to simultaneous increase in S and σ with increasing temperature. The micro (1 h BM-SPS) and nanocrystalline (5 h BM-SPS) alloys exhibited a power factor (S2σ) of 0.57 and 1.02 mWm−1K−2, respectively, at 860 K. The microcrystalline sample had a total thermal conductivity similar to bulk TiNiSn sample. The nanocrystalline alloy exhibited a ZT of 0.047 at 860 K. The microcrystalline alloy showed a ZT to 0.144 at 860 K, in comparison to the nanocrystalline alloy.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2024-01-15T14:43:46Z
2024-01-25T14:56:40Z