Abstract / Description of output
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 language | English |
|---|---|
| Pages (from-to) | 3117-3120 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 84 |
| Issue number | 14 |
| Publication status | Published - 3 Apr 2000 |
Keywords / Materials (for Non-textual outputs)
- MOLECULAR-DYNAMICS SIMULATION
- INDUCED AMORPHIZATION
- STRUCTURAL TRANSFORMATIONS
- AMORPHOUS TRANSITION
- BRILLOUIN-SCATTERING
- SILICA
- PHASE
- MINERALS
- CRYSTALS
- SIO2