Pressure-Induced Enhancement of Thermoelectric Figure of Merit and Structural Phase Transition in TiNiSn

Baker, J. L. and Kanchana, V. and et al, . (2021) Pressure-Induced Enhancement of Thermoelectric Figure of Merit and Structural Phase Transition in TiNiSn. The Journal of Physical Chemistry Letters, 12 (3). pp. 1046-1051. ISSN 1948-7185

Full text not available from this repository. (Request a copy)

Abstract

Half-Heusler thermoelectric materials are potential candidates for high thermoelectric efficiency. We report high-pressure thermoelectric and structural property measurements, density functional theory calculations on the half-Heusler material TiNiSn, and an increase of 15% in the relative dimensionless figure of merit, ZT, around 3 GPa. Thermal and electrical properties were measured utilizing a specialized sample cell assembly designed for the Paris-Edinburgh large-volume press to a maximum pressure of 3.5 GPa. High-pressure structural measurements performed up to 50 GPa in a diamond-anvil cell indicated the emergence of a new high-pressure phase around 20 GPa. A first-principles structure search performed using an ab initio random structure search approach identified the high-pressure phase as an orthorhombic type, in good agreement with the experimental results.

[error in script]

IITH Creators:

IITH Creators	ORCiD
Kanchana, Venkatakrishanan	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Dimensionless figure of merit; Pressure-induced enhancement; Structural measurements; Structural phase transition; Thermal and electrical properties; Thermo-Electric materials; Thermoelectric efficiency; Thermoelectric figure of merit

Subjects:

Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

15 Jul 2021 10:00

Last Modified:

18 Feb 2022 09:50

URI:

http://raiith.iith.ac.in/id/eprint/8343

Publisher URL:

http://doi.org/10.1021/acs.jpclett.0c03609