HR: 17:30h
AN: V32G-07    [PDF]
TI: Electrical Conductivity of SiO$_2$ above 1 Mbar
AU: * Hicks, D G
EM: hicks13@llnl.gov
AF: Lawrence Livermore National Laboratory, PO Box 808, L-399, Livermore, CA 94550
AU: Celliers, P M
AF: Lawrence Livermore National Laboratory, PO Box 808, L-399, Livermore, CA 94550
AU: Eggert, J H
AF: Lawrence Livermore National Laboratory, PO Box 808, L-399, Livermore, CA 94550
AU: Collins, G W
AF: Lawrence Livermore National Laboratory, PO Box 808, L-399, Livermore, CA 94550
AU: Boehly, T R
AF: University of Rochester, 250 E. River Rd, Rochester, NY 14623
AU: Vianello, E
AF: University of Rochester, 250 E. River Rd, Rochester, NY 14623
AU: McWilliams, R
AF: University of California, Department of Earth and Planetary Science, Berkeley, CA 94720
AU: Lee, K K
AF: University of California, Department of Earth and Planetary Science, Berkeley, CA 94720
AU: Jeanloz, R
AF: University of California, Department of Earth and Planetary Science, Berkeley, CA 94720
AB: Optical reflectivities of a few percent are detected when SiO$_2$ is shock-compressed above the melt transition, rising steadily with increasing pressure. Measurements of the optical reflectivity of laser-driven shock waves in $\alpha$-quartz and fused silica were performed over a range of pressures above 1 Mbar. By comparing the reflectivities measured on the fused silica and $\alpha$-quartz Hugoniots, which probe different regions of the SiO$_2$ phase diagram, we can infer the temperature dependence of the electrical conductivity for fluid SiO$_2$. The results have implications for understanding planetary phenomena ranging from mantle-core interactions to meteorite impact processes.
DE: 3914 Electrical properties
DE: 3924 High-pressure behavior
DE: 3944 Shock wave experiments
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting