High-pressure elasticity of alpha-quartz: Instability and ferroelastic transition

E Gregoryanz, RJ Hemley, HK Mao, P Gillet

Research output: Contribution to journalArticlepeer-review

Abstract

The single-crystal elastic moduli of alpha-quartz were measured to above 20 GPa in a diamond-anvil cell by Brillouin spectroscopy. The behavior of the elastic moduli indicates that the high-pressure phase transition in quartz is ferroelastic in nature and is driven by softening of C-44 through one of the Born stability criteria. The trends in elastic moduli confirm theoretical predictions, but there are important differences, particularly with respect to the magnitudes of the B-i. The quartz I-II transition occurs prior to complete softening of the mode and amorphization.

Original languageEnglish
Pages (from-to)3117-3120
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number14
Publication statusPublished - 3 Apr 2000

Keywords

  • MOLECULAR-DYNAMICS SIMULATION
  • INDUCED AMORPHIZATION
  • STRUCTURAL TRANSFORMATIONS
  • AMORPHOUS TRANSITION
  • BRILLOUIN-SCATTERING
  • SILICA
  • PHASE
  • MINERALS
  • CRYSTALS
  • SIO2

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