Thermoelectric properties of Ti0.3Zr0.35Hf0.35Ni1.005Sn half-Heusler alloy

Oshrat Appel; Tal Zaharoni; Gil Breuer; Ofer Beeri; Yaniv Gelbstein

doi:https://doi.org/10.1063/1.5116630

Thermoelectric properties of Ti_0.3Zr_0.35Hf_0.35Ni_1.005Sn half-Heusler alloy

Oshrat Appel, Tal Zaharoni, Gil Breuer, Ofer Beeri, Yaniv Gelbstein

Department of Materials Engineering

Ben-Gurion University of the Negev

Research output: Contribution to journal › Article › peer-review

Abstract

Thermoelectrics enabling a direct conversion of waste heat into useful electricity is widely investigated for renewable energy applications. n-Type half-Heusler (HH) MNiSn (M = Ti,Zr,Hf) thermoelectric (TE) elements are known as attractive semiconducting candidates for such purposes. Yet, both electronic and phonon scattering optimization are still required for fulfilling their full potential. In the current research, Ti_0.3Zr_0.35Hf_0.35Ni_1.005Sn separating into a main Ti_0.3Zr_0.35Hf_0.35NiSn HH matrix and a minority full-Heusler (FH) Ti_0.3Zr_0.35Hf_0.35Ni₂Sn phase is reported. Adverse electronic effects of the metallic FH phase are nearly avoided by its small relative amount and dimension, while maintaining nearly optimal electronic TE performance along with large phonon scattering, minimizing the lattice thermal conductivity. Consequently, a very high maximal TE figure of merit, ZT, of ∼1.04 is obtained, which is among the highest ever reported for n-Type MNiSn HH compounds.

Original language	American English
Article number	085110
Journal	Journal of Applied Physics
Volume	126
Issue number	8
DOIs	https://doi.org/10.1063/1.5116630
State	Published - 28 Aug 2019

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

https://doi.org/10.1063/1.5116630

Cite this

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title = "Thermoelectric properties of Ti0.3Zr0.35Hf0.35Ni1.005Sn half-Heusler alloy",

abstract = "Thermoelectrics enabling a direct conversion of waste heat into useful electricity is widely investigated for renewable energy applications. n-Type half-Heusler (HH) MNiSn (M = Ti,Zr,Hf) thermoelectric (TE) elements are known as attractive semiconducting candidates for such purposes. Yet, both electronic and phonon scattering optimization are still required for fulfilling their full potential. In the current research, Ti0.3Zr0.35Hf0.35Ni1.005Sn separating into a main Ti0.3Zr0.35Hf0.35NiSn HH matrix and a minority full-Heusler (FH) Ti0.3Zr0.35Hf0.35Ni2Sn phase is reported. Adverse electronic effects of the metallic FH phase are nearly avoided by its small relative amount and dimension, while maintaining nearly optimal electronic TE performance along with large phonon scattering, minimizing the lattice thermal conductivity. Consequently, a very high maximal TE figure of merit, ZT, of ∼1.04 is obtained, which is among the highest ever reported for n-Type MNiSn HH compounds.",

author = "Oshrat Appel and Tal Zaharoni and Gil Breuer and Ofer Beeri and Yaniv Gelbstein",

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AU - Appel, Oshrat

AU - Zaharoni, Tal

AU - Breuer, Gil

AU - Beeri, Ofer

AU - Gelbstein, Yaniv

PY - 2019/8/28

Y1 - 2019/8/28

N2 - Thermoelectrics enabling a direct conversion of waste heat into useful electricity is widely investigated for renewable energy applications. n-Type half-Heusler (HH) MNiSn (M = Ti,Zr,Hf) thermoelectric (TE) elements are known as attractive semiconducting candidates for such purposes. Yet, both electronic and phonon scattering optimization are still required for fulfilling their full potential. In the current research, Ti0.3Zr0.35Hf0.35Ni1.005Sn separating into a main Ti0.3Zr0.35Hf0.35NiSn HH matrix and a minority full-Heusler (FH) Ti0.3Zr0.35Hf0.35Ni2Sn phase is reported. Adverse electronic effects of the metallic FH phase are nearly avoided by its small relative amount and dimension, while maintaining nearly optimal electronic TE performance along with large phonon scattering, minimizing the lattice thermal conductivity. Consequently, a very high maximal TE figure of merit, ZT, of ∼1.04 is obtained, which is among the highest ever reported for n-Type MNiSn HH compounds.

AB - Thermoelectrics enabling a direct conversion of waste heat into useful electricity is widely investigated for renewable energy applications. n-Type half-Heusler (HH) MNiSn (M = Ti,Zr,Hf) thermoelectric (TE) elements are known as attractive semiconducting candidates for such purposes. Yet, both electronic and phonon scattering optimization are still required for fulfilling their full potential. In the current research, Ti0.3Zr0.35Hf0.35Ni1.005Sn separating into a main Ti0.3Zr0.35Hf0.35NiSn HH matrix and a minority full-Heusler (FH) Ti0.3Zr0.35Hf0.35Ni2Sn phase is reported. Adverse electronic effects of the metallic FH phase are nearly avoided by its small relative amount and dimension, while maintaining nearly optimal electronic TE performance along with large phonon scattering, minimizing the lattice thermal conductivity. Consequently, a very high maximal TE figure of merit, ZT, of ∼1.04 is obtained, which is among the highest ever reported for n-Type MNiSn HH compounds.

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