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000642716 1001_ $$0P:(DE-H253)PIP1092717$$aKolesnikov, Efim$$b0$$eCorresponding author
000642716 245__ $$aDepth-dependent anisotropy in the Earth’s inner core linked to chemical stratification
000642716 260__ $$a[London]$$bSpringer Nature$$c2025
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000642716 520__ $$aSeismic anisotropy in the Earth’s inner core (IC), including the heterogeneous, depth-dependent anisotropy structure, is a well-documented yet poorly understood feature plausibly related to the alignment of iron alloy crystals. Here, we report the effect of silicon and carbon on the plastic deformation of hexagonal close-packed (hcp) iron using radial X-ray diffraction at pressures up to 128 GPa and temperatures up to 1100 K. Our results reveal a low compressional wave anisotropy (~2 %) in the Fe-Si-C alloy, consistent with the seismic anisotropy observed in the outer regions of the IC. These findings, together with the higher anisotropy exhibited by pure hcp-Fe, suggest that the depth-dependent elastic anisotropy of the IC may originate from chemical stratification, i.e., radial gradients in silicon and carbon concentrations, during crystallization.
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000642716 7001_ $$0P:(DE-H253)PIP1098777$$aLi, Xiang$$b1
000642716 7001_ $$0P:(DE-H253)PIP1098802$$aMueller, Susanne$$b2
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000642716 7001_ $$0P:(DE-H253)PIP1007496$$aLiermann, Hanns-Peter$$b6$$udesy
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000642716 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/s41467-025-67067-y$$p10986$$tNature Communications$$v16$$x2041-1723$$y2025
000642716 8564_ $$uhttps://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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