Revisiting the third-order elastic constants of diamond: The higher-order effect

Mingqing Liao, Yong Liu, Yi Wang, Fei Zhou, Nan Qu, Tianyi Han, Danni Yang, Zhonghong Lai, Zi Kui Liu, Jingchuan Zhu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this letter, we investigated the higher-order effect on the third-order elastic constants (TOECs) of diamond using longitudinal stress-uniaxial strain (LSUS) approach based on density functional theory. The result shows that the higher-order effect on TOECs is not negligible in the shock wave experiments and similar calculations, and the errors are about 28% (C111), 43% (C112), 121% (C123), 486% (C144), 56% (C155) and 75% (C456). By taking the higher-order elastic response (up to fifth order) into consideration, the convergence of TOECs against maximum strain gets improved significantly and we resolve the discrepancy of several different theoretical methods and experiments.

Original languageEnglish (US)
Article number108490
JournalDiamond and Related Materials
Volume117
DOIs
StatePublished - Aug 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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