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Shock temperatures in silica glass - Implications for modes of shock-induced deformation, phase transformation, and melting with pressureObservations of shock-induced radiative thermal emissions are used to determine the gray body temperatures and emittances of silica glass under shock compression between 10 and 30 GPa. The results suggest that fused quartz deforms heterogeneously in this shock pressure range. It is shown that the 10-16 GPa range coincides with the permanent densification region, while the 16-30 GPa range coincides with the inferred mixed phase region along the silica glass Hugoniot. Low emittances in the mixed phase region are thought to represent the melting temperature of the high-pressure phase, stishovite. Also, consideration is given to the effects of pressure on melting relations for the system SiO2-Mg2SiO4.
Document ID
19890052291
Document Type
Reprint (Version printed in journal)
Authors
Schmitt, Douglas R.
(California Inst. of Tech. Pasadena, CA, United States)
Ahrens, Thomas J.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
May 10, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
89A39662
Funding Number(s)
CONTRACT_GRANT: NSF EAR-86-08249
CONTRACT_GRANT: NGL-05-002-105
Distribution Limits
Public
Copyright
Other

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