Evidence of shock-compressed stishovite above 300 GPa.

Autor: Schoelmerich MO; European XFEL, Schenefeld, 22869, Germany. markus.schoelmerich@xfel.eu., Tschentscher T; European XFEL, Schenefeld, 22869, Germany., Bhat S; Photon Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, 22607, Germany., Bolme CA; Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA., Cunningham E; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA., Farla R; Photon Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, 22607, Germany., Galtier E; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA., Gleason AE; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA., Harmand M; Institute of Mineralogy, Materials Physics and Cosmochemistry, Sorbonne Universités, Paris, 75005, France., Inubushi Y; RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan.; Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan., Katagiri K; Osaka University, Suita, Osaka, 565-0871, Japan., Miyanishi K; RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan., Nagler B; SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA., Ozaki N; Osaka University, Suita, Osaka, 565-0871, Japan., Preston TR; European XFEL, Schenefeld, 22869, Germany., Redmer R; Universität Rostock, Institut für Physik, Rostock, 18051, Germany., Smith RF; Lawrence Livermore National Laboratory, Livermore, CA, 94500, USA., Tobase T; Center for High-Pressure Science and Technology Advanced Research (HPSTAR), Shanghai, 201203, China., Togashi T; RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan.; Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan., Tracy SJ; Earth and Planets Laboratory, Carnegie Institution of Washington, Washington, D.C., 20015, USA., Umeda Y; Osaka University, Suita, Osaka, 565-0871, Japan., Wollenweber L; European XFEL, Schenefeld, 22869, Germany., Yabuuchi T; RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan.; Japan Synchrotron Radiation Research Institute, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan., Zastrau U; European XFEL, Schenefeld, 22869, Germany., Appel K; European XFEL, Schenefeld, 22869, Germany.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2020 Jun 23; Vol. 10 (1), pp. 10197. Date of Electronic Publication: 2020 Jun 23.
DOI: 10.1038/s41598-020-66340-y
Abstrakt: SiO 2 is one of the most fundamental constituents in planetary bodies, being an essential building block of major mineral phases in the crust and mantle of terrestrial planets (1-10 M E ). Silica at depths greater than 300 km may be present in the form of the rutile-type, high pressure polymorph stishovite (P4 2 /mnm) and its thermodynamic stability is of great interest for understanding the seismic and dynamic structure of planetary interiors. Previous studies on stishovite via static and dynamic (shock) compression techniques are contradictory and the observed differences in the lattice-level response is still not clearly understood. Here, laser-induced shock compression experiments at the LCLS- and SACLA XFEL light-sources elucidate the high-pressure behavior of stishovite on the lattice-level under in situ conditions on the Hugoniot to pressures above 300 GPa. We find stishovite is still (meta-)stable at these conditions, and does not undergo any phase transitions. This contradicts static experiments showing structural transformations to the CaCl 2 , α-PbO 2 and pyrite-type structures. However, rate-limited kinetic hindrance may explain our observations. These results are important to our understanding into the validity of EOS data from nanosecond experiments for geophysical applications.
Databáze: MEDLINE
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