气候变化领域集成服务门户(CCPortal): Superionic iron oxide

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DOI	10.1038/s41561-021-00696-2
	Superionic iron oxide–hydroxide in Earth’s deep mantle
	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.
发表日期	2021
ISSN	17520894
起始页码	174
结束页码	178
卷号	14 期号:3
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.
英文关键词	core-mantle boundary; detection method; electrical conductivity; high pressure; high technology industry; high temperature; hydroxide; mantle; Neptune; Uranus
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206907
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...
推荐引用方式 GB/T 7714	Hou M.,He Y.,Jang B.G.,等. Superionic iron oxide–hydroxide in Earth’s deep mantle[J],2021,14(3).
APA	Hou M..,He Y..,Jang B.G..,Sun S..,Zhuang Y..,...&Mao H.-K..(2021).Superionic iron oxide–hydroxide in Earth’s deep mantle.Nature Geoscience,14(3).
MLA	Hou M.,et al."Superionic iron oxide–hydroxide in Earth’s deep mantle".Nature Geoscience 14.3(2021).