The Use of Quartz as an Internal Pressure Standard in High .The unit-cell parameters of quartz, SiO2, have been determined by single-crystal diffraction at 22 pressures to a maximum pressure of 8.9 GPa (at room tempera- ture) with an average precision of 1 part in 9000. Pres- sure was determined by the measurement of the unit-cell volume of CaF2 fluorite included in the diamond-.Shock compression of quartz in the high-pressure fluid regime .The Hugoniot of quartz has been measured using laser-driven shock waves with pressures from 2 to 15 Mbars. Within this pressure range silica transforms from a liquid near melt into a dense plasma. Results are in good agreement with previous studies in part of this range performed using explosive- and nuclear-driven.
Ab initio studies of phonon softening and high-pressure phase .Mar 22, 2006 . Density functional perturbation theory calculations of α−quartz using extended norm conserving pseudopotentials have been used to study the elastic properties and phonon dispersion relations along various high symmetry directions as a function of bulk, uniaxial, and nonhydrostatic pressure.Stability limits and transformation pathways of α-quartz under high .Mar 31, 2017 . Here, combining in situ single-crystal x-ray diffraction experiment and advanced ab initio modeling, we report two stability limits and competing transition pathways of α-quartz under high pressure. Under near-equilibrium compression conditions at room temperature, α-quartz transits to a new P2/c silica.
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The Use of Quartz as an Internal Pressure Standard in High .
Shock compression of quartz in the high-pressure fluid regime .
Crystalline Post-Quartz Phase in Silica at High Pressure
Ab initio studies of phonon softening and high-pressure phase .
Stability limits and transformation pathways of α-quartz under high .
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