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

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.


Published in:
Physical Review Letters, 84, 3117-3120
Year:
2000
Keywords:
Laboratories:




 Record created 2011-09-29, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)