Amorphous-Like Ultralow Thermal Transport in Crystalline Argyrodite Cu 7 PS 6 .

Autor: Shen X; Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.; CRISMAT, CNRS, ENSICAEN, UNICAEN, Normandie Univ, Caen, 14000, France., Ouyang N; Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China., Huang Y; Department of Mechanical and Energy, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China., Tung YH; Jülich Centre for Neutron Science JCNS at Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85747, Garching, Germany.; Department of Physics, National Central University, Chung-Li District, Taoyuan, 320317, Taiwan., Yang CC; Department of Physics, National Central University, Chung-Li District, Taoyuan, 320317, Taiwan., Faizan M; College of Materials Science and Engineering, Jilin University, Changchun, 130012, China., Perez N; Institute for Metallic Materials, IFW-Dresden, 01069, Dresden, Germany., He R; Institute for Metallic Materials, IFW-Dresden, 01069, Dresden, Germany., Sotnikov A; Institute for Solid State Research, Leibniz IFW-Dresden, 01069, Dresden, Germany., Willa K; Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany., Wang C; Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China., Chen Y; Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China., Guilmeau E; CRISMAT, CNRS, ENSICAEN, UNICAEN, Normandie Univ, Caen, 14000, France.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2024 Jun; Vol. 11 (22), pp. e2400258. Date of Electronic Publication: 2024 Mar 25.
DOI: 10.1002/advs.202400258
Abstrakt: Due to their amorphous-like ultralow lattice thermal conductivity both below and above the superionic phase transition, crystalline Cu- and Ag-based superionic argyrodites have garnered widespread attention as promising thermoelectric materials. However, despite their intriguing properties, quantifying their lattice thermal conductivities and a comprehensive understanding of the microscopic dynamics that drive these extraordinary properties are still lacking. Here, an integrated experimental and theoretical approach is adopted to reveal the presence of Cu-dominated low-energy optical phonons in the Cu-based argyrodite Cu 7 PS 6 . These phonons yield strong acoustic-optical phonon scattering through avoided crossing, enabling ultralow lattice thermal conductivity. The Unified Theory of thermal transport is employed to analyze heat conduction and successfully reproduce the experimental amorphous-like ultralow lattice thermal conductivities, ranging from 0.43 to 0.58 W m -1 K -1 , in the temperature range of 100-400 K. The study reveals that the amorphous-like ultralow thermal conductivity of Cu 7 PS 6 stems from a significantly dominant wave-like conduction mechanism. Moreover, the simulations elucidate the wave-like thermal transport mainly results from the contribution of Cu-associated low-energy overlapping optical phonons. This study highlights the crucial role of low-energy and overlapping optical modes in facilitating amorphous-like ultralow thermal transport, providing a thorough understanding of the underlying complex dynamics of argyrodites.
(© 2024 The Authors. Advanced Science published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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