DOI: 10.1038/s41561-020-00684-y
论文题名: Implications of the iron oxide phase transition on the interiors of rocky exoplanets
作者: Coppari F. ; Smith R.F. ; Wang J. ; Millot M. ; Kim D. ; Rygg J.R. ; Hamel S. ; Eggert J.H. ; Duffy T.S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 3 起始页码: 121
结束页码: 126
语种: 英语
英文关键词: core-mantle boundary
; iron oxide
; phase transition
; planetary evolution
; planetary landform
; rheology
; stratification
; X-ray diffraction
英文摘要: The discovery of an extraordinary number of extrasolar planets, characterized by an unexpected variety of sizes, masses and orbits, challenges our understanding of the formation and evolution of the planets in the Solar System and the perception of the Earth as the prototypical habitable world. Many exoplanets appear to be rocky and yet more massive than the Earth, with expected pressures and temperatures of hundreds of gigapascal and thousands of Kelvin in their deep interiors. At these conditions, the properties of bridgmanite and ferropericlase, expected to dominate their mantles, are largely unconstrained, limiting our knowledge of their interior structure. Here we used nano-second X-ray diffraction and dynamic compression to experimentally investigate the atomic structure and density of iron oxide (FeO), one of the end-members of the (Mg,Fe)O ferropericlase solid solution, up to 700 GPa, a pressure exceeding the core–mantle boundary of a 5 Earth masses planet. Our data document the stability of the high-pressure cesium-chloride B2 structure above 300 GPa, well below the pressure required for magnesium oxide (MgO) to adopt the same phase. These observations, complemented by the calculation of the binary MgO–FeO phase diagram, reveal complex stratification and rheology inside large terrestrial exoplanets. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169737
Appears in Collections: 气候变化与战略
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作者单位: Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Geosciences, Princeton University, Princeton, NJ, United States; Laboratory for Laser Energetics, University of Rochester, Rochester, United States; Department of Mechanical Engineering, University of Rochester, Rochester, NY, United States; Department of Physics and Astronomy, University of Rochester, Rochester, NY, United States
Recommended Citation:
Coppari F.,Smith R.F.,Wang J.,et al. Implications of the iron oxide phase transition on the interiors of rocky exoplanets[J]. Nature Geoscience,2021-01-01,14(3)