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• W4256660752 abstract "Recent numerical-modelling and seismological results have raised new questions about the dynamics1,2 and magnetism3,4 of the Earth's core. Knowledge of the elasticity and texture of iron5,6 at core pressures is crucial for understanding the seismological observations, such as the low attenuation of seismic waves, thelow shear-wave velocity7,8 and the anisotropy of compressional-wave velocity9,10,11. The density and bulk modulus of hexagonal-close-packed iron have been previously measured to core pressures by static12 and dynamic13,14 methods. Here we study,using radial X-ray diffraction15 and ultrasonic techniques16, the shear modulus, single-crystal elasticity tensor, aggregate compressional- and shear-wave velocities, and orientation dependence of these velocities in iron. The inner core shear-wave velocity is lower than the aggregate shear-wave velocity of iron, suggesting the presence of low-velocity components or anelastic effects in the core. Observation of a strong lattice strain anisotropy in iron samples indicates a large (∼24%) compressional-wave anisotropy under the isostress assumption, and therefore a perfect alignment of crystals6 would not be needed to explain the seismic observations. Alternatively the strain anisotropy may indicate stress variation due to preferred slip systems." @default.
• W4256660752 created "2022-05-12" @default.
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• W4256660752 date "1998-12-24" @default.
• W4256660752 modified "2023-10-03" @default.
• W4256660752 title "Elasticity and rheology of iron above 220 GPa and the nature of the Earth's inner core" @default.
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• W4256660752 doi "https://doi.org/10.1038/25506" @default.
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