Deviatoric stress in a girdle-anvil type high-pressure apparatus: effect on the quartz-coesite phase transformation

Details Deviatoric stress in a girdle-anvil type high-pressure apparatus: effect on the quartz-coesite phase transformation Deviatoric stress in a girdle-anvil type high-pressure apparatus: effect on the quartz-coesite phase transformation

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...54..378i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 54, Issue 3-4, p. 378-385.

Physics

11

Scientific paper

The deviatoric (non-hydrostatic) stress produced in a large-volume, high-pressure apparatus of the girdle-anvil type has been estimated from the density of free dislocations induced in olivine or MgO single crystals. This stress can be adjusted from 30 MPa in NaCl cell assemblies to > 400 MPa in BN. For the phase transformation from quartz to coesite in SiO2, the deviatoric stress does not affect the equilibrium boundary or the kinetics of the transformation, but has a marked influence on the microstructure of the high-pressure coesite phase.

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