Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...13..907f&link_type=abstract
In: Lunar and Planetary Science Conference, 13th, Houston, TX, March 15-19, 1982, Proceedings. Part 2. (A83-21281 07-91) Washing
Physics
Cooling, Crystallization, Glass, Lunar Composition, Lunar Rocks, Phase Transformations, Glass Transition Temperature, Heat Transfer, Melts (Crystal Growth), Phase Diagrams, Silica Glass, Thermal Analysis, Viscosity
Scientific paper
Cooling rates required to form glassy or partly-crystalline bodies of 14 lunar compositions have been estimated using a previously introduced, simplified model. The calculated cooling rates are found to be in good agreement with cooling rates measured for the same compositions. Measurements are also reported of the liquidus temperature and glass transition temperature for each composition. Inferred cooling rates are combined with heat flow analyses to obtain insight into the thermal histories of samples 15422, 14162, 15025, 74220, 74241, 10084, 15425, and 15427. The critical cooling rates required to form glasses of 24 lunar compositions, including the 14 compositions of the present study, are suggested to increase systematically with increasing ratio of total network modifiers/total network formers in the compositions. This reflects the importance of melt viscosity in affecting glass formation.
Fang C.-Y.
Uhlmann Donald R.
Yinnon H.
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