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Title: Structures and localized vibrational states of defects in graphite by tight-binding calculations

Abstract

The structural and vibrational properties of pristine graphite and point defects in graphite are studied by tight-binding (TB) calculations using a three-center TB potential model. We showed that the three-center TB potential without ‘‘ad hoc’’ van der Waals interaction corrections can accurately describe the inter-layer distance of graphite and the lowest-energy structures and stabilities of typical point defects in graphite. The results from our TB calculations are in good agreement with those from density-functional theory calculations with van der Waals interaction corrections. We also investigated the vibrational properties to gain better understanding on the localization of vibrational states induced by the point defects. Our calculation results show that although localized or quasi-localized vibrational modes can be found in all defected graphite, the localization induced by Frenkel pair, dual-vacancy, and dual-interstitial defects is much stronger. Atomic displacements associated with the localized vibrational modes induced by these three point defects are also analyzed

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2]
  1. Qingdao University, Shandong (China); Ames Lab., and Iowa State University, Ames, IA (United States)
  2. Ames Lab., and Iowa State University, 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). Materials Sciences & Engineering Division
OSTI Identifier:
1886208
Alternate Identifier(s):
OSTI ID: 1889440
Report Number(s):
IS-J-10,886; IS-J-10,900
Journal ID: ISSN 1463-9076
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP
Additional Journal Information:
Journal Volume: 24; Journal Issue: 36; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Cheng, Rong, Lu, Wen-Cai, Ho, K. M., and Wang, C. Z. Structures and localized vibrational states of defects in graphite by tight-binding calculations. United States: N. p., 2022. Web. doi:10.1039/d2cp03165e.
Cheng, Rong, Lu, Wen-Cai, Ho, K. M., & Wang, C. Z. Structures and localized vibrational states of defects in graphite by tight-binding calculations. United States. https://doi.org/10.1039/d2cp03165e
Cheng, Rong, Lu, Wen-Cai, Ho, K. M., and Wang, C. Z. Thu . "Structures and localized vibrational states of defects in graphite by tight-binding calculations". United States. https://doi.org/10.1039/d2cp03165e. https://www.osti.gov/servlets/purl/1886208.
@article{osti_1886208,
title = {Structures and localized vibrational states of defects in graphite by tight-binding calculations},
author = {Cheng, Rong and Lu, Wen-Cai and Ho, K. M. and Wang, C. Z.},
abstractNote = {The structural and vibrational properties of pristine graphite and point defects in graphite are studied by tight-binding (TB) calculations using a three-center TB potential model. We showed that the three-center TB potential without ‘‘ad hoc’’ van der Waals interaction corrections can accurately describe the inter-layer distance of graphite and the lowest-energy structures and stabilities of typical point defects in graphite. The results from our TB calculations are in good agreement with those from density-functional theory calculations with van der Waals interaction corrections. We also investigated the vibrational properties to gain better understanding on the localization of vibrational states induced by the point defects. Our calculation results show that although localized or quasi-localized vibrational modes can be found in all defected graphite, the localization induced by Frenkel pair, dual-vacancy, and dual-interstitial defects is much stronger. Atomic displacements associated with the localized vibrational modes induced by these three point defects are also analyzed},
doi = {10.1039/d2cp03165e},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 36,
volume = 24,
place = {United States},
year = {Thu Aug 18 00:00:00 EDT 2022},
month = {Thu Aug 18 00:00:00 EDT 2022}
}

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