Electrical Conductivity of SiO2 above 1 Mbar

Details Electrical Conductivity of SiO2 above 1 Mbar Electrical Conductivity of SiO2 above 1 Mbar

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.v32g..07h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #V32G-07

Physics

3914 Electrical Properties, 3924 High-Pressure Behavior, 3944 Shock Wave Experiments

Scientific paper

Optical reflectivities of a few percent are detected when SiO2 is shock-compressed above the melt transition, rising steadily with increasing pressure. Measurements of the optical reflectivity of laser-driven shock waves in α -quartz and fused silica were performed over a range of pressures above 1 Mbar. By comparing the reflectivities measured on the fused silica and α -quartz Hugoniots, which probe different regions of the SiO2 phase diagram, we can infer the temperature dependence of the electrical conductivity for fluid SiO2. The results have implications for understanding planetary phenomena ranging from mantle-core interactions to meteorite impact processes.

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