Microstructural observations of alpha-quartz amorphization

Details Microstructural observations of alpha-quartz amorphization Microstructural observations of alpha-quartz amorphization

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...259..666k&link_type=abstract

Science (ISSN 0036-8075), vol. 259, no. 5095, p. 666-669.

Computer Science

91

Amorphous Materials, Microstructure, Phase Transformations, Quartz Crystals, Crystal Lattices, Crystallinity, Raman Spectra, Transmission Electron Microscopy

Scientific paper

Microscopic observations indicate that amorphization of alpha-quartz begins with formation of crystallographically controlled planar defects and is followed by growth of amorphous silicon dioxide at these defect sites. Similar transformation microstructures are found in quartz upon quasi-hydrostatic and nonhydrostatic compression in a diamond-anvil cell to 40 gigapascals and from simple comminution. The results suggest that there is a common mechanism for solid-state amorphization of silicates in static and shock high-pressure experiments, meteorite impact, and deformation by tectonic processes. In general, these results are consistent with recently proposed shear instability models of amorphization.

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