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Direct Observation of Shock‐Induced Disordering of Enstatite Below the Melting Temperature
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- J.‐A. Hernandez
- LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
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- G. Morard
- Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, UMR CNRS 7590, Museum National d'Histoire Naturelle, IRD Paris France
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- M. Guarguaglini
- LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
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- R. Alonso‐Mori
- SLAC National Accelerator Laboratory Menlo Park CA USA
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- A. Benuzzi‐Mounaix
- LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
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- R. Bolis
- LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
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- G. Fiquet
- Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, UMR CNRS 7590, Museum National d'Histoire Naturelle, IRD Paris France
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- E. Galtier
- SLAC National Accelerator Laboratory Menlo Park CA USA
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- A. E. Gleason
- SLAC National Accelerator Laboratory Menlo Park CA USA
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- S. Glenzer
- SLAC National Accelerator Laboratory Menlo Park CA USA
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- F. Guyot
- Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, UMR CNRS 7590, Museum National d'Histoire Naturelle, IRD Paris France
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- B. Ko
- School of Earth and Space Exploration Arizona State University Tempe AZ USA
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- H. J. Lee
- SLAC National Accelerator Laboratory Menlo Park CA USA
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- W. L. Mao
- Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park CA USA
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- B. Nagler
- SLAC National Accelerator Laboratory Menlo Park CA USA
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- N. Ozaki
- Graduate School of Engineering Osaka University, Suita Osaka Japan
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- A. K. Schuster
- Helmholtz‐Zentrum Dresden‐Rossendorf Dresden Germany
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- S. H. Shim
- School of Earth and Space Exploration Arizona State University Tempe AZ USA
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- T. Vinci
- LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
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- A. Ravasio
- LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
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Description
<jats:title>Abstract</jats:title><jats:p>We report in situ structural measurements of shock‐compressed single crystal orthoenstatite up to 337 ± 55 GPa on the Hugoniot, obtained by coupling ultrafast X‐ray diffraction to laser‐driven shock compression. Shock compression induces a disordering of the crystalline structure evidenced by the appearance of a diffuse X‐ray diffraction signal at nanosecond timescales at 80 ± 13 GPa on the Hugoniot, well below the equilibrium melting pressure (>170 GPa). The formation of bridgmanite and post‐perovskite have been indirectly reported in microsecond‐scale plate‐impact experiments. Therefore, we interpret the high‐pressure disordered state we observed at nanosecond scale as an intermediate structure from which bridgmanite and post‐perovskite crystallize at longer timescales. This evidence of a disordered structure of MgSiO<jats:sub>3</jats:sub> on the Hugoniot indicates that the degree of polymerization of silicates is a key parameter to constrain the actual thermodynamics of shocks in natural environments.</jats:p>
Journal
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- Geophysical Research Letters
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Geophysical Research Letters 47 (15), 2020-08-03
American Geophysical Union (AGU)
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Keywords
Details 詳細情報について
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- CRID
- 1360857593756100096
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- ISSN
- 19448007
- 00948276
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- HANDLE
- 10852/82109
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- Article Type
- journal article
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- Data Source
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- Crossref
- KAKEN
- OpenAIRE