Stability and P-V-T Equations of State of High-Pressure Iron-Sulfur Compounds

Details Stability and P-V-T Equations of State of High-Pressure Iron-Sulfur Compounds Stability and P-V-T Equations of State of High-Pressure Iron-Sulfur Compounds

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.p12b1067f&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #P12B-1067

Physics

3630 Experimental Mineralogy And Petrology, 3672 Planetary Mineralogy And Petrology (5410), 3919 Equations Of State, 3924 High-Pressure Behavior, 3954 X Ray, Neutron, And Electron Spectroscopy And Diffraction

Scientific paper

It has long been hypothesized that iron and perhaps sulfur are important contributors to the cores of terrestrial planets. In order to assess the incorporation of sulfur in a metallic iron core, we must understand phase relations in the Fe-S system at high pressure and temperature. The absence of structure and pressure-density data for the Fe3S2 and Fe2S high-pressure phases limits the ability to fully characterize the Fe-S system at high pressure and temperature. In this study, we report new experimental results on the stability, in-situ structure, and P-V-T equations of state of the high-pressure iron-sulfur compounds. Experiments were performed in a multi-anvil apparatus using an 8/3 assembly at beamline BL04B1 in the SPring-8 synchrotron facility. FeS and Fe were mixed in appropriate proportions (Fe3S2 and Fe2S) and loaded into a MgO capsule. The MgO capsule material was also utilized as an internal pressure calibrant. The Fe-FeS mixtures were first pressurized to about 20 GPa at room temperature. The sample was then heated with a rhenium foil heater to 1073 K and held at that temperature for two to four hours to promote formation of the high-pressure Fe-S phase. Temperatures were measured using a W0.05Re-W0.26Re thermocouple. X-ray diffraction data of the samples were collected at appropriate time intervals to address reaction kinetics. The relative intensities of the diffraction lines associated with metallic Fe and the high-pressure Fe-S compounds (Fe3S2 or Fe2S) decreased and increased, respectively, with time. The observed diffraction peaks at simultaneous high pressure and temperature will be used to determine the in-situ structures of Fe3S2 and Fe2S. We also obtained P-V-T data for Fe3S whose structure type has been previously determined, over a wide pressure-temperature range. These data will be used to constructed density profiles of S-bearing iron cores and to evaluate core composition models

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