气候变化领域集成服务门户(CCPortal): Direct Observation of Shock-Induced Disordering of Enstatite Below the Melting Temperature

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DOI	10.1029/2020GL088887
	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.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	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.
英文关键词	Magnesium compounds; Perovskite; Semiconductor insulator boundaries; Silicates; Single crystals; Thermodynamics; X ray diffraction; Crystalline structure; Degree of polymerization; Direct observations; Disordered structures; Intermediate structures; Natural environments; Structural measurements; Ultrafast x-ray diffraction; Melting; compression; crystal structure; enstatite; melting; perovskite; polymerization; pressure field; thermodynamics; X-ray diffraction
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170050
作者单位	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; SLAC National Accelerator Laboratory, Menlo Park, CA, United States; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, United States; 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
推荐引用方式 GB/T 7714	Hernandez J.-A.,Morard G.,Guarguaglini M.,et al. Direct Observation of Shock-Induced Disordering of Enstatite Below the Melting Temperature[J],2020,47(15).
APA	Hernandez J.-A..,Morard G..,Guarguaglini M..,Alonso-Mori R..,Benuzzi-Mounaix A..,...&Ravasio A..(2020).Direct Observation of Shock-Induced Disordering of Enstatite Below the Melting Temperature.Geophysical Research Letters,47(15).
MLA	Hernandez J.-A.,et al."Direct Observation of Shock-Induced Disordering of Enstatite Below the Melting Temperature".Geophysical Research Letters 47.15(2020).