Physics – Condensed Matter
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..shk.j5004s&link_type=abstract
American Physical Society, Shock Compression of Condensed Matter Meeting, June 24-29, 2001 Renaissance Waverly Hotel, Atlanta, G
Physics
Condensed Matter
Scientific paper
We have measured the H_2O ice shock Hugoniot at initial temperatures between 70-200 K. We find that, at all temperatures, shock compression is dominated by solid-solid phase transitions. Ice I transforms to ice VI when shocked above the Hugoniot Elastic Limit at T>83±5 K. The ice Hugoniot skips over the equilibrium phases III, V, II, and IX, similar to the way the SiO2 Hugoniot bypasses the coesite structure. In addition, porous ice forms ice VI, not ice I, upon shock compaction. At T<83±5 K, we have discovered that both solid and porous ice display anomalous compression paths when subject to impacts that would normally yield shock pressures between 1-4 GPa. The anomalous compression is a ramp wave, similar to wave profiles in fused quartz, and may be related to the formation of amorphous ice. Mutual collisions between cometesimals in the Kuiper Belt occur under the same impact conditions that produce the anomalous compression. Therefore, this new phenomenon in ice may play an important role in the evolution of comets before they enter the inner solar system.
Ahrens Thomas J.
Stewart Sarah T.
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