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Abstract
Seismological observations indicate Earth's inner core (IC) is heterogeneous and anisotropic. The driving force for this anisotropic texture is unclear. This study reveals that H-ion diffusion in superionic Fe-H alloy is anisotropic, with the lowest energy barrier along the c-axis. An external electric field favors Fe-H lattice alignment with the c-axis pointing towards the field. The Earth's geomagnetic field aligns Fe-H alloys with the c-axis parallel to the equatorial plane, creating seismic anisotropy consistent with IC observations. This suggests a strong coupling between IC structure and the geomagnetic field.
Publisher
Nature Communications
Published On
Mar 24, 2023
Authors
Shichuan Sun, Yu He, Junyi Yang, Yufeng Lin, Jinfeng Li, Duck Young Kim, Heping Li, Ho-kwang Mao
Tags
inner core
anisotropy
H-ion diffusion
Fe-H alloy
geomagnetic field
seismology
earth sciences

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