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Title: Lattice hardening due to vacancy diffusion in (GeTe) mSb 2Te 3 alloys

Abstract

GeTe-Sb 2 Te 3 alloys have been widely studied for use in rewritable media, and in recent years, they have emerged as excellent thermoelectric materials, with reports of z T > 2 for Ge-rich compositions. GeTe-Sb 2 Te 3 alloys exhibit a solid-state phase transition from a layered structure with rhombohedral symmetry to a cubic rocksalt structure, which plays an important role in their thermoelectric behavior. In this work, we investigate the impact of the phase transition on the thermal expansion and elastic moduli of (GeTe) 17 Sb 2 Te 3 using high-temperature X-ray diffraction and resonant ultrasound spectroscopy. The high-temperature elastic moduli of GeTe, Sb 2Te 3, and Bi 2 Te 3 were also measured for comparison. Although it is typical for materials to soften with increasing temperature due to thermal expansion, our study reveals anomalous hardening of the elastic moduli in (GeTe) 17 Sb 2 Te 3 at temperatures below the phase transition, followed by further hardening at the transition temperature. In contrast, the elastic moduli of GeTe, Sb 2 Te 3 , and Bi 2 Te 3 soften with increasing temperature. We attribute the anomalous hardening of (GeTe) 17 Sb 2 Te 3 to the gradual vacancy diffusion accompanying the transition from a layered to a cubic structure. The stiffening elastic moduli lead to increasing speed of sound, which impacts the lattice thermal conductivity by flattening the temperature dependence.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1596864
Alternate Identifier(s):
OSTI ID: 1545964
Grant/Contract Number:  
[SC0019252; SC0001054]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
[ Journal Volume: 126; Journal Issue: 5]; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Peng, Wanyue, Smiadak, David M., Boehlert, Michael G., Mather, Spencer, Williams, Jared B., Morelli, Donald T., and Zevalkink, Alexandra. Lattice hardening due to vacancy diffusion in (GeTe)mSb2Te3 alloys. United States: N. p., 2019. Web. doi:10.1063/1.5108659.
Peng, Wanyue, Smiadak, David M., Boehlert, Michael G., Mather, Spencer, Williams, Jared B., Morelli, Donald T., & Zevalkink, Alexandra. Lattice hardening due to vacancy diffusion in (GeTe)mSb2Te3 alloys. United States. doi:10.1063/1.5108659.
Peng, Wanyue, Smiadak, David M., Boehlert, Michael G., Mather, Spencer, Williams, Jared B., Morelli, Donald T., and Zevalkink, Alexandra. Thu . "Lattice hardening due to vacancy diffusion in (GeTe)mSb2Te3 alloys". United States. doi:10.1063/1.5108659.
@article{osti_1596864,
title = {Lattice hardening due to vacancy diffusion in (GeTe)mSb2Te3 alloys},
author = {Peng, Wanyue and Smiadak, David M. and Boehlert, Michael G. and Mather, Spencer and Williams, Jared B. and Morelli, Donald T. and Zevalkink, Alexandra},
abstractNote = {GeTe-Sb2Te3 alloys have been widely studied for use in rewritable media, and in recent years, they have emerged as excellent thermoelectric materials, with reports of zT>2 for Ge-rich compositions. GeTe-Sb2Te3 alloys exhibit a solid-state phase transition from a layered structure with rhombohedral symmetry to a cubic rocksalt structure, which plays an important role in their thermoelectric behavior. In this work, we investigate the impact of the phase transition on the thermal expansion and elastic moduli of (GeTe)17Sb2Te3 using high-temperature X-ray diffraction and resonant ultrasound spectroscopy. The high-temperature elastic moduli of GeTe, Sb2Te3, and Bi2Te3 were also measured for comparison. Although it is typical for materials to soften with increasing temperature due to thermal expansion, our study reveals anomalous hardening of the elastic moduli in (GeTe)17Sb2Te3 at temperatures below the phase transition, followed by further hardening at the transition temperature. In contrast, the elastic moduli of GeTe, Sb2Te3, and Bi2Te3 soften with increasing temperature. We attribute the anomalous hardening of (GeTe)17Sb2Te3 to the gradual vacancy diffusion accompanying the transition from a layered to a cubic structure. The stiffening elastic moduli lead to increasing speed of sound, which impacts the lattice thermal conductivity by flattening the temperature dependence.},
doi = {10.1063/1.5108659},
journal = {Journal of Applied Physics},
number = [5],
volume = [126],
place = {United States},
year = {2019},
month = {8}
}

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