Superionic effect and anisotropic texture in Earth’s inner core driven by geomagnetic field
Seismological observations suggest that Earth’s inner core (IC) is heterogeneous and anisotropic. Increasing seismological observations make the understanding of the mineralogy and mechanism for the complex IC texture extremely challenging, and the driving force for the anisotropic texture remains unclear. Under IC conditions, hydrogen becomes highly diffusive like liquid in the hexagonal-close-packed (hcp) solid Fe lattice, which is known as the superionic state. Here, we reveal that H-ion diffusion in superionic Fe-H alloy is anisotropic with the lowest barrier energy along the c-axis. In the presence of an external electric field, the alignment of the Fe-H lattice with the c-axis pointing to the field direction is energetically favorable. Due to this effect, Fe-H alloys are aligned with the c-axis parallel to the equatorial plane by the diffusion of the north–south dipole geomagnetic field into the inner core. The aligned texture driven by the geomagnetic field presents significant seismic anisotropy, which explains the anisotropic seismic velocities in the IC, suggesting a strong coupling between the IC structure and geomagnetic field.
NI Journal Papers
Youth Innovation Promotion Association of the Chinese Academy of Sciences;National Natural Science Foundation of China-Yunnan Joint Fund;
|WOS Research Area|
Science & Technology - Other Topics
|WOS Accession No|
Cited Times [WOS]:1
|Document Type||Journal Article|
|Department||Department of Earth and Space Sciences|
1.Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou,550081,China
2.University of Chinese Academy of Sciences,Beijing,100049,China
3.Center for High Pressure Science and Technology Advanced Research,Shanghai,201203,China
4.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
Sun，Shichuan,He，Yu,Yang，Junyi,等. Superionic effect and anisotropic texture in Earth’s inner core driven by geomagnetic field[J]. Nature Communications,2023,14(1).
Sun，Shichuan.,He，Yu.,Yang，Junyi.,Lin，Yufeng.,Li，Jinfeng.,...&Mao，Ho kwang.(2023).Superionic effect and anisotropic texture in Earth’s inner core driven by geomagnetic field.Nature Communications,14(1).
Sun，Shichuan,et al."Superionic effect and anisotropic texture in Earth’s inner core driven by geomagnetic field".Nature Communications 14.1(2023).
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