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Title: Anharmonic stabilization and lattice heat transport in rocksalt β-GeTe

Abstract

Peierls-Boltzmann transport equation, coupled with third-order anharmonic lattice dynamics calculations, has been widely used to model lattice thermal conductivity (κ l) in bulk crystals. However, its application to materials with structural phase transition at relatively high temperature is fundamentally challenged by the presence of lattice instabilities (imaginary phonon modes). Additionally, its accuracy suffers from the absence of higher-than-third-order phonon scattering processes, which are important near/above the Debye temperature. In this letter, we present an effective scheme that combines temperature-induced anharmonic phonon renormalization and four-phonon scattering to resolve these two theoretical challenges. Here, we apply this scheme to investigate the lattice dynamics and thermal transport properties of GeTe, which undergoes a second-order ferroelectric phase transition from rhombohedral α-GeTe to rocksalt β-GeTe at about 700 K. Our results on the high-temperature phase β-GeTe at 800 K confirm the stabilization of β-GeTe by temperature effects. We find that considering only three-phonon scattering leads to significantly overestimated κ l of 3.8 W/mK at 800 K, whereas including four-phonon scattering reduces κ l to 1.7 W/mK, a value comparable with experiments. To explore the possibility to further suppress κ l, we show that alloying β-GeTe with heavy cations such as Pb and Bi can effectivelymore » reduce κ l to about 1.0 W/mK, whereas particle size needs to be around 10 nm through nanostructuring to achieve a comparable reduction in κ l.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1491401
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 19; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Xia, Yi, and Chan, Maria K. Y. Anharmonic stabilization and lattice heat transport in rocksalt β-GeTe. United States: N. p., 2018. Web. doi:10.1063/1.5048814.
Xia, Yi, & Chan, Maria K. Y. Anharmonic stabilization and lattice heat transport in rocksalt β-GeTe. United States. doi:10.1063/1.5048814.
Xia, Yi, and Chan, Maria K. Y. Mon . "Anharmonic stabilization and lattice heat transport in rocksalt β-GeTe". United States. doi:10.1063/1.5048814.
@article{osti_1491401,
title = {Anharmonic stabilization and lattice heat transport in rocksalt β-GeTe},
author = {Xia, Yi and Chan, Maria K. Y.},
abstractNote = {Peierls-Boltzmann transport equation, coupled with third-order anharmonic lattice dynamics calculations, has been widely used to model lattice thermal conductivity (κl) in bulk crystals. However, its application to materials with structural phase transition at relatively high temperature is fundamentally challenged by the presence of lattice instabilities (imaginary phonon modes). Additionally, its accuracy suffers from the absence of higher-than-third-order phonon scattering processes, which are important near/above the Debye temperature. In this letter, we present an effective scheme that combines temperature-induced anharmonic phonon renormalization and four-phonon scattering to resolve these two theoretical challenges. Here, we apply this scheme to investigate the lattice dynamics and thermal transport properties of GeTe, which undergoes a second-order ferroelectric phase transition from rhombohedral α-GeTe to rocksalt β-GeTe at about 700 K. Our results on the high-temperature phase β-GeTe at 800 K confirm the stabilization of β-GeTe by temperature effects. We find that considering only three-phonon scattering leads to significantly overestimated κl of 3.8 W/mK at 800 K, whereas including four-phonon scattering reduces κl to 1.7 W/mK, a value comparable with experiments. To explore the possibility to further suppress κl, we show that alloying β-GeTe with heavy cations such as Pb and Bi can effectively reduce κl to about 1.0 W/mK, whereas particle size needs to be around 10 nm through nanostructuring to achieve a comparable reduction in κl.},
doi = {10.1063/1.5048814},
journal = {Applied Physics Letters},
number = 19,
volume = 113,
place = {United States},
year = {2018},
month = {11}
}

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