Thermal Expansion of Fe3S

Details Thermal Expansion of Fe3S Thermal Expansion of Fe3S

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr31a0131c&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #MR31A-0131

Physics

1015 Composition Of The Core, 3630 Experimental Mineralogy And Petrology, 3919 Equations Of State, 3924 High-Pressure Behavior, 3949 Thermal Expansivity

Scientific paper

We have investigated the thermal expansion of the iron-sulfur compound Fe3S at pressures up to 42.5 GPa and temperatures to 900 K by using synchrotron X-ray diffraction techniques. It has been well recognized that iron and sulfur are possible elements in the cores of the terrestrial planets. According to our present knowledge, Fe3S is the most iron-rich compound in the Fe-S system. The Earth's core probably has sulfur content between pure iron and Fe3S. Given higher sulfur content, Fe3S is a possible component of the Martian inner core. Hence, the equation-of-state of Fe3S is of fundamental importance for our understanding of the Earth's and planetary cores. The room temperature compression curve of Fe3S was determined by Fei et al. [1]. To date, no experimental data have been reported on the thermal expansion of Fe3S. In this study, we report in situ measurements of thermal expansion of Fe3S at high pressure by means of an externally-heated diamond-anvil cell and the energy-dispersive X-ray diffraction techniques at x17c beamline, the National Synchrotron Light Source, Brookhaven National Laboratory. The measured thermal expansion for Fe3S can be directly used for modeling the cores of the terrestrial planets and is important for interpreting current geophysical observations of the Earth's and planetary cores. [1]Fei, Y.-W. , Li, J., Bertka, C.M., and Prewitt, C.T. (2000) Structure type and bulk modulus of Fe3S, a new iron-sulfur compound. American Mineralogist, 85, 1830-1833.

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