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Title: Temperature dependence of structural, dynamical, and electronic properties of amorphous Bi 2Te 3: an ab initio study

Abstract

Bismuth telluride (Bi 2Te 3) has garnered significant interest in thermoelectric applications and three-dimensional topological insulators due to its unique electronic, transport, and thermal properties. Bi 2Te 3 and Sb 2Te 3 chalcogenide compounds have the same crystal structure. While Sb 2Te 3 has been shown to be a prototypical phase change memory (PCM) compound along the pseudobinary tie-line of Ge-Sb-Te alloys, whether Bi 2Te 3 can also exhibit PCM functionality is still not well established. In this work, a systematic study on the structural, dynamical, and electronic properties of amorphous Bi 2Te 3 during the quenching process has been performed by using ab initio molecular dynamics simulations. Pair correlation function, coordination number, bond-angle distribution functions, and a novel atomistic cluster alignment method are used to explore the structural characteristics of Bi 2Te 3 as a function of temperature. Our study shows that there are many distorted octahedral clusters in amorphous Bi 2Te 3. In comparison with the local structures in Sb 2Te 3, we found that the degree of distortion of the octahedrons in the Bi 2Te 3 system is smaller than that in Sb 2Te 3 system. Moreover, the changes in the dynamical properties of Bi 2Te 3more » from liquid to glassy state are also explored. The approximate range of liquid-to-glass transition temperature is determined to be between 673 and 723 K. The electronic properties of Bi2Te 3 and Sb 2Te 3 are also analysed by density-of-states and Bader charge calculations, both of them in glass state are semiconductors. Our studies provide useful insights into the local structure and dynamical properties of Bi 2Te 3 at the atomistic level during the fast cooling process, and suggest that the compound can be a candidate for PCM materials.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]; ORCiD logo [3]; ORCiD logo [4];  [4]
  1. Fudan Univ., Shanghai (China)
  2. Fudan Univ., Shanghai (China); Key Lab. for Information Science of Electromagnetic Waves (MoE), Shanghai (China)
  3. National Taiwan Univ., Taipei (Taiwan); Taiwan Semiconductor Research Inst., Hsinchu (Taiwan)
  4. Ames Lab., and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; NSF of China
OSTI Identifier:
1580525
Report Number(s):
IS-J-10,115
Journal ID: ISSN 1367-2630
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 21; Journal Issue: 9; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ab initio molecular dynamics; liquid materials; local structure; dynamical properties

Citation Formats

Guo, Y. R., Qiao, Chong, Wang, J. J., Shen, H., Wang, S. Y., Zheng, Y. X., Zhang, R. J., Chen, L. Y., Su, Wan-Sheng, Wang, C. Z., and Ho, K. M. Temperature dependence of structural, dynamical, and electronic properties of amorphous Bi2Te3: an ab initio study. United States: N. p., 2019. Web. doi:10.1088/1367-2630/ab4535.
Guo, Y. R., Qiao, Chong, Wang, J. J., Shen, H., Wang, S. Y., Zheng, Y. X., Zhang, R. J., Chen, L. Y., Su, Wan-Sheng, Wang, C. Z., & Ho, K. M. Temperature dependence of structural, dynamical, and electronic properties of amorphous Bi2Te3: an ab initio study. United States. doi:10.1088/1367-2630/ab4535.
Guo, Y. R., Qiao, Chong, Wang, J. J., Shen, H., Wang, S. Y., Zheng, Y. X., Zhang, R. J., Chen, L. Y., Su, Wan-Sheng, Wang, C. Z., and Ho, K. M. Mon . "Temperature dependence of structural, dynamical, and electronic properties of amorphous Bi2Te3: an ab initio study". United States. doi:10.1088/1367-2630/ab4535. https://www.osti.gov/servlets/purl/1580525.
@article{osti_1580525,
title = {Temperature dependence of structural, dynamical, and electronic properties of amorphous Bi2Te3: an ab initio study},
author = {Guo, Y. R. and Qiao, Chong and Wang, J. J. and Shen, H. and Wang, S. Y. and Zheng, Y. X. and Zhang, R. J. and Chen, L. Y. and Su, Wan-Sheng and Wang, C. Z. and Ho, K. M.},
abstractNote = {Bismuth telluride (Bi2Te3) has garnered significant interest in thermoelectric applications and three-dimensional topological insulators due to its unique electronic, transport, and thermal properties. Bi2Te3 and Sb2Te3 chalcogenide compounds have the same crystal structure. While Sb2Te3 has been shown to be a prototypical phase change memory (PCM) compound along the pseudobinary tie-line of Ge-Sb-Te alloys, whether Bi2Te3 can also exhibit PCM functionality is still not well established. In this work, a systematic study on the structural, dynamical, and electronic properties of amorphous Bi2Te3 during the quenching process has been performed by using ab initio molecular dynamics simulations. Pair correlation function, coordination number, bond-angle distribution functions, and a novel atomistic cluster alignment method are used to explore the structural characteristics of Bi2Te3 as a function of temperature. Our study shows that there are many distorted octahedral clusters in amorphous Bi2Te3. In comparison with the local structures in Sb2Te3, we found that the degree of distortion of the octahedrons in the Bi2Te3 system is smaller than that in Sb2Te3 system. Moreover, the changes in the dynamical properties of Bi2Te3 from liquid to glassy state are also explored. The approximate range of liquid-to-glass transition temperature is determined to be between 673 and 723 K. The electronic properties of Bi2Te3 and Sb2Te3 are also analysed by density-of-states and Bader charge calculations, both of them in glass state are semiconductors. Our studies provide useful insights into the local structure and dynamical properties of Bi2Te3 at the atomistic level during the fast cooling process, and suggest that the compound can be a candidate for PCM materials.},
doi = {10.1088/1367-2630/ab4535},
journal = {New Journal of Physics},
number = 9,
volume = 21,
place = {United States},
year = {2019},
month = {9}
}

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