globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00696-2
论文题名:
Superionic iron oxide–hydroxide in Earth’s deep mantle
作者: Hou M.; He Y.; Jang B.G.; Sun S.; Zhuang Y.; Deng L.; Tang R.; Chen J.; Ke F.; Meng Y.; Prakapenka V.B.; Chen B.; Shim J.H.; Liu J.; Kim D.Y.; Hu Q.; Pickard C.J.; Needs R.J.; Mao H.-K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:3
起始页码: 174
结束页码: 178
语种: 英语
英文关键词: core-mantle boundary ; detection method ; electrical conductivity ; high pressure ; high technology industry ; high temperature ; hydroxide ; mantle ; Neptune ; Uranus
英文摘要: Water ice becomes a superionic phase under the high pressure and temperature conditions of deep planetary interiors of ice planets such as Neptune and Uranus, which affects interior structures and generates magnetic fields. The solid Earth, however, contains only hydrous minerals with a negligible amount of ice. Here we combine high pressure and temperature electrical conductivity experiments, Raman spectroscopy and first-principles simulations to investigate the state of hydrogen in the pyrite-type FeO2Hx (x ≤ 1), which is a potential H-bearing phase near the core–mantle boundary. We find that when the pressure increases beyond 73 GPa at room temperature, symmetric hydroxyl bonds are softened and the H+ (or proton) becomes diffusive within the vicinity of its crystallographic site. Increasing temperature under pressure, the diffusivity of hydrogen is extended beyond the individual unit cell to cover the entire solid, and the electrical conductivity soars, indicating a transition to the superionic state, which is characterized by freely moving protons and a solid FeO2 lattice. The highly diffusive hydrogen provides fresh transport mechanisms for charge and mass, which dictate the geophysical behaviours of electrical conductivity and magnetism, as well as geochemical processes of redox, hydrogen circulation and hydrogen isotopic mixing in Earth’s deep mantle. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169763
Appears in Collections:气候变化与战略

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作者单位: Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing, China; Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States; Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China; Department of Chemistry, Pohang University of Science and Technology, Pohang, South Korea; College of New Materials and New Energies, Shenzhen Technology UniversityGuangdong, China; School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, China; Center for Study of Matter under Extreme Conditions, Department of Mechanical and Materials Engineering, Florida International University, Miami, FL, United States; Department of Geological Sciences, Stanford University, Stanford, CA, United States; High Pressure Collaborative Access Team, X-ray Science Division, Argonne National Laboratory, Argonne, IL, United States; Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, United States; Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, United Kingdom; Advanced Institute for Materials Research, Tohoku University, Aoba, Sendai, Japan; Theory of Condensed Matter Group, Cavendish Laboratory, Cambridge, United Kingdom

Recommended Citation:
Hou M.,He Y.,Jang B.G.,et al. Superionic iron oxide–hydroxide in Earth’s deep mantle[J]. Nature Geoscience,2021-01-01,14(3)
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