Abstract
Silica (SiO 2 ) exhibits extensive polymorphism at elevated pressures. X-ray diffraction measurements showed that a high-pressure form with a pyrite-type structure, denser than other known silica phases, is stable above 268 giga-pascals and 1800 kelvin. The silicon coordination number increases from 6 in the α-PbO 2 -type phase to 6+2 in the pyrite-type phase, leading to a large increase in density by about 5% at the phase transition.
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@article{Kuwayama_2005, title={The Pyrite-Type High-Pressure Form of Silica}, volume={309}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1114879}, DOI={10.1126/science.1114879}, number={5736}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Kuwayama, Yasuhiro and Hirose, Kei and Sata, Nagayoshi and Ohishi, Yasuo}, year={2005}, month=aug, pages={923–925} }