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DOI | 10.1029/2020GL088887 |
Direct observation of shock‐induced disordering of enstatite below the melting temperature | |
J.‐; A. Hernandez; G. Morard; M. Guarguaglini; R. Alonso‐; Mori; A. Benuzzi‐; Mounaix; R. Bolis; G. Fiquet; E. Galtier; A. E. Gleason; S. Glenzer; F. Guyot; B. Ko; H. J. Lee; W. L. Mao; B. Nagler; N. Ozaki; A. K. Schuster; S. H. Shim; T. Vinci; A. Ravasio | |
2020-07-17 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
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 (XRD) to laser‐driven shock‐compression. Shock compression induces a disordering of the crystalline structure evidenced by the appearance of a diffuse XRD signal at nanosecond time scales 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. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/284278 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | J.‐,A. Hernandez,G. Morard,等. Direct observation of shock‐induced disordering of enstatite below the melting temperature[J]. Geophysical Research Letters,2020. |
APA | J.‐.,A. Hernandez.,G. Morard.,M. Guarguaglini.,R. Alonso‐.,...&A. Ravasio.(2020).Direct observation of shock‐induced disordering of enstatite below the melting temperature.Geophysical Research Letters. |
MLA | J.‐,et al."Direct observation of shock‐induced disordering of enstatite below the melting temperature".Geophysical Research Letters (2020). |
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