Pressure-induced magnetic transition and sound velocities of Fe3C: Implications for carbon in the Earth's inner core

Details Pressure-induced magnetic transition and sound velocities of Fe3C: Implications for carbon in the Earth's inner core Pressure-induced magnetic transition and sound velocities of Fe3C: Implications for carbon in the Earth's inner core

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517306g&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 17, CiteID L17306

Physics

8

Geochemistry: Composition Of The Core, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Global Change: Solid Earth (1225)

Scientific paper

We have carried out nuclear resonant scattering measurements on 57Fe-enriched Fe3C between 1 bar and 50 GPa at 300 K. Synchrotron Mössbauer spectra reveal a pressure-induced magnetic transition in Fe3C between 4.3 and 6.5 GPa. On the basis of our nuclear resonant inelastic X-ray scattering spectra and existing equation-of-state data, we have derived the compressional wave velocity V P and shear wave velocity V S for the high-pressure nonmagnetic phase, which can be expressed as functions of density (ρ): V P (km/s) = -3.99 + 1.29ρ(g/cm3) and V S (km/s) = 1.45 + 0.24ρ(g/cm3). The addition of carbon to iron-nickel alloy brings density, V P and V S closer to seismic observations, supporting carbon as a principal light element in the Earth's inner core.

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