Liquid Core Materials: Pressure-effect on Their Density, Structure and Chemical Properties.

Details Liquid Core Materials: Pressure-effect on Their Density, Structure and Chemical Properties. Liquid Core Materials: Pressure-effect on Their Density, Structure and Chemical Properties.

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p42a..01s&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #P42A-01

Physics

1015 Composition Of The Core, 3630 Experimental Mineralogy And Petrology, 3924 High-Pressure Behavior, 3954 X Ray, Neutron, And Electron Spectroscopy And Diffraction, 8147 Planetary Interiors (5430, 5724)

Scientific paper

Knowing the physical properties of Fe-based liquids would greatly improve our understanding of the composition of planetary cores as well as their formation. A complementary approach is the experimental determination of ternary and quaternary phase diagrams. At ambient pressure, ternary diagrams of potential liquid core materials show a large gap of miscibility (Fe-S-Si, Fe-FeO and Fe-S-C systems). This would limit for instance the solubility of Si in a primary Fe-S melt percolating through the surrounding silicates during planetary differentiation.
Two issues will be addressed: 1) what are the equations of state of simple binary liquid Fe-alloys?, and 2) how the Fe-S-Si ternary diagram evolves with pressure in terms of im/miscibility? Density of liquid Fe-Si alloys was measured in situ at high pressure by an X-ray absorption technique using synchrotron radiation. We compare the equations of state of Fe, Fe-Si and Fe-S liquids to identify the effect of light elements, Si vs S, on the compressibility, local order and P-waves velocity of these materials. These data give us a basis to apprehend more complicated though more realistic ternary systems. We report melting experiments in the Fe-S-Si system conducted in a multi-anvil apparatus up to 27 GPa. The chemical evolution of both liquids with pressure and temperature is followed by in situ x-ray diffraction experiments. The experiments document the change of melting relations with increasing pressure. The results have important implications for the differentiation processes of the planets and the composition of their cores.

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