Fe2N-type SiO2 from shocked quartz |
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| Institution: | 1. Sigma Space Corporation, 4600 Forbes Blvd., Lanham MD 20706, United States;2. Goddard Space Flight Center, 8800 Greenbelt Rd., Greenbelt, MD 20771, United States;3. Deptartment of Earth, Atmospheric and Planetary Sciences, MIT, 77 Massachusetts Ave. Cambridge, MA 02139, United States;1. Institute of Geodesy and Geoinformation Science, Technische Universität Berlin, Berlin 10623, Germany;2. Freie Universität Berlin, Malteserstr., 74-100, Haus D, Berlin 12249, Germany;3. Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin 10115, Germany;4. Institute of Planetary Research, German Aerospace Center (DLR), Berlin 12489, Germany |
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| Abstract: | The modified niccolite structure (Fe2N-type) of SiO2, previously found in diamond anvil experiments at 35 to 40 GPa, was formed in a porous mixture of crystalline α-quartz and copper powder at shock pressures estimated at 12 to 27 GPa. It is suggested that quartz can invert during shock compression not only to coesite, stishovite and an amorphous or glass phase of silica, but also to Fe2N-type SiO2, depending upon the shock history. |
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