Pa 3̅ Modified Fluorite-Type Structures in Metal Dioxides at High Pressure
- 2 February 1996
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 271 (5249), 629-631
- https://doi.org/10.1126/science.271.5249.629
Abstract
Rutile-structured SnO2, PbO2, and RuO2 have long been known to transform to cubic high-pressure phases, for which a fluorite structure has been assumed. Rietveld refinement results from x-ray diffraction studies indicated that these phases have a modified fluorite structure (space group Pa ). Thus, for metal dioxides, all known cubic, postrutile phases have the Pa structure, thereby providing experimental examples of the high-pressure structure predicted from theoretical calculations for stishovite (rutile-structured silica). High-pressure transitions in stishovite may have profound implications for the geochemistry of the core-mantle boundary.Keywords
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