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Title: Evidence of shock-compressed stishovite above 300 GPa

Journal Article · · Scientific Reports
 [1];  [1];  [2];  [3];  [4];  [2];  [4];  [4];  [5];  [6];  [7];  [8];  [4];  [7];  [1];  [9];  [10];  [11];  [6];  [12] more »;  [7];  [1];  [6];  [1];  [1] « less
  1. European X-ray Free-Electron Laser (XFEL), Schenefeld (Germany)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Photon Science
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Sorbonne Univ., Paris (France). Inst. of Mineralogy, Materials Physics and Cosmochemistry
  6. RIKEN SPring-8 Center, Hyogo (Japan); Japan Synchrotron Radiation Research Institute, Hyogo (Japan)
  7. Osaka Univ. (Japan)
  8. RIKEN SPring-8 Center, Hyogo (Japan)
  9. Univ. of Rostock (Germany). Inst. für Physik
  10. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  11. Center for High-Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
  12. Carnegie Inst. of Washington, Washington, DC (United States). Earth and Planets Lab.

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); European Research Council (ERC); Japan Synchrotron Radiation Research Institute; Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT); Japan Society for the Promotion of Science (JSPS); German Federal Ministry of Education and Research (BMBF); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC02-76SF00515; 670787-D-PLANETDIVE; 2019A8072; JPMXS0118067246; 19K2186; 16H02246; 05K16WC2; 05K13WC2; EAR-1644614; AC52-07NA27344
OSTI ID:
1647239
Alternate ID(s):
OSTI ID: 1879803
Report Number(s):
LLNL-JRNL-837095; TRN: US2202788
Journal Information:
Scientific Reports, Vol. 10, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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