Reduced Lattice Thermal Conductivity for Half-Heusler ZrNiSn through Cryogenic Mechanical Alloying

Bahrami A, Ying P, Wolff U, Rodriguez NP, Schierning G, Nielsch K, He R (2021)

Publication Type: Journal article

Publication year: 2021

Journal

ACS Applied Materials and Interfaces American Chemical Society

Book Volume: 13

Pages Range: 38561-38568

Journal Issue: 32

DOI: 10.1021/acsami.1c05639

Abstract

The ZrNiSn-based half-Heusler compounds are promising for thermoelectric applications in the mid-to-high temperature range. However, their thermoelectric performance was greatly limited due to the remaining high thermal conductivity, especially the lattice thermal conductivity. Herein, we report the synthesis of pristine half-Heusler ZrNiSn through direct mechanical alloying at a liquid nitrogen temperature (i.e., cryomilling) followed by spark plasma sintering. It is shown that the onset sintering temperature is greatly reduced for the cryomilled powders with a high density. A reduced thermal conductivity is subsequently realized from room temperature to 700 °C in the cryomilled samples than the one that was differently prepared (from 7.3 to 4.5 W/m K at room temperature). The pronounced reduction in thermal conductivity of ZrNiSn yields a maximum zT of ∼0.65 at 700 °C. Our study shows the possibility of cryomilling in advancing the thermoelectric performance through enhanced phonon scattering.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden

Germany (DE) Universität Bielefeld

Germany (DE)

How to cite

APA:

Bahrami, A., Ying, P., Wolff, U., Rodriguez, N.P., Schierning, G., Nielsch, K., & He, R. (2021). Reduced Lattice Thermal Conductivity for Half-Heusler ZrNiSn through Cryogenic Mechanical Alloying. ACS Applied Materials and Interfaces, 13(32), 38561-38568. https://doi.org/10.1021/acsami.1c05639

MLA:

Bahrami, Amin, et al. "Reduced Lattice Thermal Conductivity for Half-Heusler ZrNiSn through Cryogenic Mechanical Alloying." ACS Applied Materials and Interfaces 13.32 (2021): 38561-38568.

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