Related Experiment Video
Updated: Jul 19, 2026

High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
Published on: April 3, 2018
High-pressure elasticity of alpha-quartz: instability and ferroelastic transition
Gregoryanz1, Hemley, Mao
1Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, USA.
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 C44 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.
More Related Videos
10:36Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
Published on: May 20, 2018
07:48An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
Published on: June 18, 2020
Related Concept Videos
Strain and Elastic Modulus
Plastic Behavior
Temperature Dependent Deformation
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Elastic Strain Energy for Normal Stresses
If...
Elastic Strain Energy for Shearing Stresses