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Geophysical and Material Science Implications of the Post-Stishovite Phase

Ahrens, Thomas J. (1996) Geophysical and Material Science Implications of the Post-Stishovite Phase. In: Advanced materials '96: new trends in high pressure research. National Institute for Research in Inorganic Materials , Tsukuba, Japan, pp. 1-4. ISBN 4944122012. http://resolver.caltech.edu/CaltechAUTHORS:20160411-084949104

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Abstract

Recent shock data for TiO_2 and SiO_2, when taken with static results for RuO_2 and HfO_2 suggest that this group of oxides transforms from the 6-fold coordinated rutile structure to the 8-fold coordinated fluorite structure which is 7-8 % denser than rutile. In the case of SiO_2, the transition to a fluorite structure may be representative of the lower mantle silicate transitions which could occur in the D" zone. There may be technological interest in the fluorite-structured oxides because these are predicted to be as hard or harder than cubic boron nitride. In the case of fluorite-structured SiO_2 and HfO_2 hardnesses, comparable or greater than diamond are predicted.


Item Type:Book Section
Additional Information:© 1996 National Institute for Research in Inorganic Materials. Research supported by the Army Research Office. I appreciate the advice of George Rossman on mineral hardnesses. Contribution #5648, Division of Geological and Planetary Sciences, California Institute of Technology.
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Army Research Office (ARO)UNSPECIFIED
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Caltech Division of Geological and Planetary Sciences5648
Record Number:CaltechAUTHORS:20160411-084949104
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160411-084949104
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66043
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Apr 2016 18:23
Last Modified:13 Apr 2016 18:23

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