Direct Observation of Shock‐Induced Disordering of Enstatite Below the Melting Temperature

Hernandez, J. ‐A.; Morard, G.; Guarguaglini, M.; Alonso‐Mori, R.; Benuzzi‐Mounaix, A.; Bolis, R.; Fiquet, G.; Galtier, E.; Gleason, A. E.; Glenzer, S.; Guyot, F.; Ko, B.; Lee, H. J.; Mao, W. L.; Nagler, B.; Ozaki, N.; Schuster, A. K.; Shim, S. H.; Vinci, T.; Ravasio, A.

doi:10.1029/2020GL088887

Direct Observation of Shock‐Induced Disordering of Enstatite Below the Melting Temperature

Journal Article · Mon Aug 03 00:00:00 EDT 2020 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2020GL088887· OSTI ID:1644697

^[1]; Morard, G. ^[2]; ^[3]; Alonso‐Mori, R. ^[4]; Benuzzi‐Mounaix, A. ^[3]; ^[3]; Fiquet, G. ^[5]; Galtier, E. ^[4]; Gleason, A. E. ^[4]; Glenzer, S. ^[4]; Guyot, F. ^[5]; ^[6]; Lee, H. J. ^[4]; Mao, W. L. ^[7]; Nagler, B. ^[4]; ^[8]; ^[9]; ^[6]; ^[3]; Ravasio, A. ^[3]

LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France, Centre for Earth Evolution and Dynamics University of Oslo Oslo Norway
Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, UMR CNRS 7590, Museum National d'Histoire Naturelle, IRD Paris France, Institut des Sciences de la Terre, Université Grenoble‐Alpes Gières France
LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris Palaiseau France
SLAC National Accelerator Laboratory Menlo Park CA USA
Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, UMR CNRS 7590, Museum National d'Histoire Naturelle, IRD Paris France
School of Earth and Space Exploration Arizona State University Tempe AZ USA
Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park CA USA
Graduate School of Engineering Osaka University, Suita Osaka Japan, Institute of Laser Engineering Osaka University, Suita Osaka Japan
Helmholtz‐Zentrum Dresden‐Rossendorf Dresden Germany, Institute of Solid State and Materials Physics Technische Universität Dresden Dresden Germany

Abstract

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 ₃ 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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1644697

Alternate ID(s):: OSTI ID: 1644698

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 15 Vol. 47; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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