Sound velocities of iron-nickel and iron-silicon alloys at high pressures

Details Sound velocities of iron-nickel and iron-silicon alloys at high pressures Sound velocities of iron-nickel and iron-silicon alloys at high pressures

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30sde11l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 21, pp. SDE 11-1, CiteID 2112, DOI 10.1029/2003GL018405

Physics

10

Geochemistry: Composition Of The Core, Mineral Physics: Elasticity And Anelasticity, Mineral Physics: High-Pressure Behavior, Mineral Physics: Physical Thermodynamics, Tectonophysics: Earth'S Interior-Composition And State (1212)

Scientific paper

Understanding the alloying effects of nickel and light element(s) on the physical properties of iron under core conditions is crucial for interpreting and constraining geophysical and geochemical models. We have studied two alloys, Fe0.92Ni0.08 and Fe0.85Si0.15, with nuclear resonant inelastic x-ray scattering up to 106 GPa and 70 GPa, respectively. The sound velocities of the alloys are obtained from the measured partial phonon density of states for 57Fe incorporated in the alloys. Addition of Ni slightly decreases the compression wave velocity and shear wave velocity of Fe under high pressures. Silicon alloyed with Fe increases the compressional wave velocity and shear wave velocity under high pressures, which provides a better match to seismological data of the Earth's core.

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