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001     642716
005     20260109212428.0
024 7 _ |a 10.1038/s41467-025-67067-y
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100 1 _ |a Kolesnikov, Efim
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245 _ _ |a Depth-dependent anisotropy in the Earth’s inner core linked to chemical stratification
260 _ _ |a [London]
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500 _ _ |a The grant from German ResearchFoundation (DFG) through the DFG Project AOBJ: 662965 GZ.:KU 3832/2–1 was not found in the system. Please add this one also to the financial sources
520 _ _ |a Seismic anisotropy in the Earth’s inner core (IC), including the heterogeneous, depth-dependent anisotropy structure, is a well-documented yet poorly understood feature plausibly related to the alignment of iron alloy crystals. Here, we report the effect of silicon and carbon on the plastic deformation of hexagonal close-packed (hcp) iron using radial X-ray diffraction at pressures up to 128 GPa and temperatures up to 1100 K. Our results reveal a low compressional wave anisotropy (~2 %) in the Fe-Si-C alloy, consistent with the seismic anisotropy observed in the outer regions of the IC. These findings, together with the higher anisotropy exhibited by pure hcp-Fe, suggest that the depth-dependent elastic anisotropy of the IC may originate from chemical stratification, i.e., radial gradients in silicon and carbon concentrations, during crystallization.
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700 1 _ |a Li, Xiang
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700 1 _ |a Mueller, Susanne
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700 1 _ |a Rohrbach, Arno
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773 _ _ |a 10.1038/s41467-025-67067-y
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856 4 _ |u https://www.nature.com/articles/s41467-025-67067-y#:~:text=These%20findings%2C%20together%20with%20the,and%20carbon%20concentrations%2C%20during%20crystallization.
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