Shock-Ramp of SiO<sub>2</sub> Melt
ORAL
Abstract
SiO2 is an endmember for all silicate materials. As such, having a robust equation of state for SiO2 is of fundamental importance for planetary and materials sciences. We will present experimental shock-ramp data from the Z-machine at Sandia National Laboratories for two samples of SiO2 melt at pressures >80 GPa. The starting materials are Corning SiO2 glasses: one sample is anhydrous containing <1ppm OH and the other is nominally hydrated with 1000ppm OH, typical of some industrially produced high-purity SiO2 glasses. Initial results suggest that the nominally hydrated SiO2 melt is stiffer on ramp compression than the anhydrous melt. Also, we find that the Los Alamos’ OpenSesame EOS SiO2 models the initial shock for both melts well, but does not to reproduce the ramp path for either sample. We will combine experimental data and theoretical results from classical atomistic simulation and density-functional theory calculations to investigate the atomic origin of the observed physical properties.
*Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.
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Presenters
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Alisha N Clark
- University of Colorado, Boulder
- University of Colorado Boulder