TY - JOUR
T1 - Evidence of shock-compressed stishovite above 300 GPa
AU - Schoelmerich, Markus O.
AU - Tschentscher, Thomas
AU - Bhat, Shrikant
AU - Bolme, Cindy A.
AU - Cunningham, Eric
AU - Farla, Robert
AU - Galtier, Eric
AU - Gleason, Arianna E.
AU - Harmand, Marion
AU - Inubushi, Yuichi
AU - Katagiri, Kento
AU - Miyanishi, Kohei
AU - Nagler, Bob
AU - Ozaki, Norimasa
AU - Preston, Thomas R.
AU - Redmer, Ronald
AU - Smith, Ray F.
AU - Tobase, Tsubasa
AU - Togashi, Tadashi
AU - Tracy, Sally J.
AU - Umeda, Yuhei
AU - Wollenweber, Lennart
AU - Yabuuchi, Toshinori
AU - Zastrau, Ulf
AU - Appel, Karen
N1 - Funding Information:
M.S., K.A., Th.Ts. and R.R. acknowledge support from the DFG (FOR 2440). A.G. acknowledges support from LANL Reines-LDRD. M.H. acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 670787 D PLANETDIVE). Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The MEC instrument is supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences under Contract No. DE-AC02-76SF00515. This experiment was furthermore performed at BL3 of SACLA with the approval of the Japan Synchrotron Radiation Research Institute (proposal nos. 2019A8072). This work was supported by grants from MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) grant no. JPMXS0118067246, Japan Society for the Promotion of Science (JSPS) KAKENHI (grant nos. 19K21866 & 16H02246), Genesis Research Institute, Inc. (Konpon-ken, Toyota). Financial support was also provided by the Federal Ministry of Education and Research, Germany (BMBF, grant no.: 05K16WC2 & 05K13WC2). Parts of this research were carried out at the large volume press (LVP) beamline P61B at PETRAIII DESY Hamburg, a member of the Helmholtz Association (HGF). This study was also supported by National Science Foundation (EAR-1644614). The authors would like to thank the reviewers for their constructive comments.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - SiO2 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 ME). Silica at depths greater than 300 km may be present in the form of the rutile-type, high pressure polymorph stishovite (P42/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 CaCl2, α-PbO2 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.
AB - SiO2 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 ME). Silica at depths greater than 300 km may be present in the form of the rutile-type, high pressure polymorph stishovite (P42/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 CaCl2, α-PbO2 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.
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U2 - 10.1038/s41598-020-66340-y
DO - 10.1038/s41598-020-66340-y
M3 - Article
C2 - 32576908
AN - SCOPUS:85087017900
VL - 10
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 10197
ER -