High-pressure and high-temperature polymorphism in silica

L. S. Dubrovinsky Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, D-95440, Germany

N. A. Dubrovinskaia Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, D-95440, Germany

V. Prakapenka APS CARS, University of Chicago, 9700 S. Cass Ave, Argonne, IL, 60439, USA

F. Seifert Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, D-95440, Germany

F. Langenhorst Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, D-95440, Germany

V. Dmitriev SNBL, European Synchrotron Radiation Facility, Grenoble, 38043, France

H.-P. Weber SNBL, European Synchrotron Radiation Facility, Grenoble, 38043, France

T. Le Bihan European Synchrotron Radiation Facility, Grenoble, 38043, France

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We synthesised a number of new silica modifications in the electrically heated diamond anvil cells at pressures over 100 GPa and temperatures over 1200 K. The structure of these polymorphs is based on hexagonal close packing of oxygen atoms with different degree of ordering of silicon atoms in octahedral and tetrahedral sites.

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High-pressure and high-temperature polymorphism in silica

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High-pressure and high-temperature polymorphism in silica

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