Computer Science
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1687k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 7, pp.1687-1692
Computer Science
2
Scientific paper
Recent evidence from static compression, spectroscopy and relaxational studies all support the conclusion that there are no significant structural relaxation mechanisms with mean durations longer than the order of microseconds (frequencies below the MHz range) at superliquidus temperatures in silicate compositions. Evidence suggests that volume and shear relaxation times are similar, and are distributed over a narrow range of frequencies. These relaxation processes probably represent high-frequency high-temperature manifestations of the glass transition. The results of this study support earlier assertions that relaxed longitudinal ultrasonic velocities provide an accurate means of determining the compressibility of silicate melts. The observed discrepancy between ultrasonically derived compressibilities and those derived from high-pressure falling-sphere experiments cannot be attributed to relaxation effects.
Carmichael Ian S. E.
Kress Victor C.
Williams Quentin
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