Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3107604s&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 7, CiteID L07604
Physics
11
Geochemistry: Composition Of The Core, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
Density of liquid Fe-Si alloys was measured in situ up to 5 GPa-1725 K by an X-ray absorption technique using synchrotron radiation. Increasing the amount of silicon in liquid iron decreases the bulk incompressibility by only -0.5 GPa per 1 weight% of Si. These data confirm our previous prediction of a negligible effect of Si on liquid Fe bulk properties, prediction based on the observation of a similar local structure in liquid Fe and liquid Fe-Si alloys. Si and S have therefore opposite effects on P-waves velocity (vP = $\sqrt{K/\rho), both elements reduce the bulk density of liquid iron but only S affects its compressibility. Since compression-wave velocities in the Earth's outer core are slightly higher than in pure liquid Fe in the same P-T conditions, it implies that Si would correct this discrepancy while S would increase it.
Fiquet Guillaume
Gregoryanz Eugene
Mezouar Mohamed
Morard Guillaume
Sanloup Chrystèle
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