Pressure-induced amorphization of crystalline silica

Details Pressure-induced amorphization of crystalline silica Pressure-induced amorphization of crystalline silica

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.334...52h&link_type=abstract

Nature (ISSN 0028-0836), vol. 334, July 7, 1988, p. 52-54. Research supported by SSRL and NSF.

Computer Science

264

Amorphous Silicon, Order-Disorder Transformations, Pressure Effects, Silicon Dioxide, Coesite, Crystallinity, Phase Transformations, Quartz, Shock Loads

Scientific paper

In situ synchrotron X-ray diffraction measurements of alpha-quartz and coesite in a diamond-anvil cell are reported that demonstrate that these crystalline materials transform to amorphous solids at 25-35 GPa and 300 K. It is shown that an internally consistent thermodynamic description of the process is possible, extending into the pressure domain recent thermodynamic calculations of thermally-induced amorphization of silica polymorphs. The measurements provide constraints on the equations of state and melting relations in this system at high pressures, shed light on the mechanism for glass formation in SiO2 in laboratory shock-wave experiments and meteorite-impact events, and provide insights into the thermoelastic stability of tetrahedral network structures at high compression.

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