Spectroscopic and x-ray diffraction studies of metastable crystalline-amorphous transitions in Ca(OH)2 and serpentine
Abstract
We document changes in the x-ray diffraction and Raman scattering from samples of Ca(OH)2 and serpentine as they undergo reversible crystalline-amorphous transitions at high pressures and room temperature. These measurements show that the crystalline and high pressure amorphous phases are structurally distinct. We find that the transition mechanisms only require short-range atomic displacements, and that they seem to involve the discrete transformation of crystalline to amorphous material rather than a gradual disordering of the crystal. These results are consistent with previous observations of acoustic emissions during the amorphization of serpentine.
- Publication:
-
Geophysical Monograph Series
- Pub Date:
- 1992
- DOI:
- 10.1029/GM067p0485
- Bibcode:
- 1992GMS....67..485M