A Cu-based Cu8−xGe(S, Te)6 argyrodite: its widespan cubic-phase region and ultralow lattice thermal conductivity

Yi-Fen Tsai; Charlotte L. Stern; Bo-Chia Chen; G. Jeffrey Snyder; Hsin-Jay Wu

doi:10.1039/D3TA01476B

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A Cu-based Cu_8−xGe(S, Te)₆ argyrodite: its widespan cubic-phase region and ultralow lattice thermal conductivity†

Yi-Fen Tsai,^a Charlotte L. Stern,^b Bo-Chia Chen,^a G. Jeffrey Snyder

*^c and Hsin-Jay Wu

*^a

Author affiliations

* Corresponding authors

^a Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
E-mail: ssky0211@nycu.edu.tw

^b Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA

^c Department of Materials Science and Engineering, Northwestern University, Evanston 60208, USA
E-mail: jeff.snyder@northwestern.edu

Abstract

This work discloses a newly-discovered Cu_8−xGe(S, Te)₆ argyrodite stabilizing in a high-symmetry cubic phase in the entire low-to-mid temperature region (250–700 K). Partially substituting the sulfur with tellurium increases the configuration entropy, enabling the Cu_8−xGe(S, Te)₆ as a promising mid-entropy thermoelectric (TE) alloy with ultralow thermal conductivity.

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Article information

DOI: https://doi.org/10.1039/D3TA01476B
Article type: Communication
Submitted: 10 Mar 2023
Accepted: 25 Apr 2023
First published: 25 Apr 2023

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J. Mater. Chem. A, 2023,11, 10532-10537

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A Cu-based Cu_8−xGe(S, Te)₆ argyrodite: its widespan cubic-phase region and ultralow lattice thermal conductivity

Y. Tsai, C. L. Stern, B. Chen, G. J. Snyder and H. Wu, J. Mater. Chem. A, 2023, 11, 10532 DOI: 10.1039/D3TA01476B

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Journal of Materials Chemistry A