Depressurization amorphization of single-crystal boron carbide

X. Q. Yan, Z. Tang, L. Zhang, J. J. Guo, C. Q. Jin, Y. Zhang, T. Goto, J. W. McCauley, M. W. Chen

Research output: Contribution to journalArticlepeer-review

153 Citations (Scopus)


We report depressurization amorphization of single-crystal boron carbide (B4C) investigated by in situ high-pressure Raman spectroscopy. It was found that localized amorphization of B4C takes place during unloading from high pressures, and nonhydrostatic stresses play a critical role in the high-pressure phase transition. First-principles molecular dynamics simulations reveal that the depressurization amorphization results from pressure-induced irreversible bending of C-B-C atomic chains cross-linking 12 atom icosahedra at the rhombohedral vertices.

Original languageEnglish
Article number075505
JournalPhysical review letters
Issue number7
Publication statusPublished - 2009 Feb 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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