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Direct Observation of Shock-Induced Disordering of Enstatite Below the Melting Temperature
Authors
R. Alonso-Mori
A. Benuzzi-Mounaix
+18 more
R. Bolis
G. Fiquet
E. Galtier
A.E. Gleason
S. Glenzer
M. Guarguaglini
F. Guyot
J.-A. Hernandez
B. Ko
H.J. Lee
W.L. Mao
G. Morard
B. Nagler
N. Ozaki
A. Ravasio
A.K. Schuster
S.H. Shim
T. Vinci
Publication date
1 January 2020
Publisher
Hoboken, NJ [u.a.] : Wiley
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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 MgSiO3 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. © 2020. The Authors
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Last time updated on 23/07/2022