Diamond at Extreme Conditions

Details Diamond at Extreme Conditions Diamond at Extreme Conditions

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmmr51b0965m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #MR51B-0965

Physics

3900 Mineral Physics, 3914 Electrical Properties, 3944 Shock Wave Experiments, 5420 Impact Phenomena, Cratering (6022, 8136), 5724 Interiors (8147)

Scientific paper

The properties of carbon at high temperature and pressure are of broad interest in planetary science, due to its abundance in planetary bodies, the use of diamond as tracers of terrestrial impact events, and the unparalleled utility of diamonds as high-pressure anvils in the laboratory. We use powerful (TW = 1000 J/ns) lasers to drive shock waves into single-crystal diamond, simultaneously compressing and heating the material. The optical transparency of diamond makes it ideal for studies of carbon at such extreme conditions. Using a suite of ultrafast (picosecond- to nanosecond-resolution) optical diagnostics, including pyrometry and Raman scattering, we have characterized the equation of state, melting curve, electronic conductivity, index of refraction, and elastic-plastic behavior of single-crystal diamond under shock compression to pressures in excess of 10 Mbar and temperatures of several thousand Kelvin.

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