Thermal expansion of Fe3C at high pressure and carbon in the Earth's inner core

Details Thermal expansion of Fe3C at high pressure and carbon in the Earth's inner core Thermal expansion of Fe3C at high pressure and carbon in the Earth's inner core

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmmr41a1781g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #MR41A-1781

Physics

1615 Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), 3919 Equations Of State, 3949 Thermal Expansivity, 8124 Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

Carbon is one of the major candidates for the principal light element in the Earth's core. Wood [1993] proposed that Fe3C, rather than iron-nickel alloy, is the dominant phase in the Earth's solid inner core. Testing the model of Fe3C-rich inner core requires knowledge on the thermal equation-of-state (EoS) of Fe3C under core conditions. To date, EoS data of Fe3C are only available at high pressure and 0 or 300 K [Scott et al., 2001, Li et al., 2002, Vocadlo et al., 2002] or at high temperature and 1 bar [Wood et al., 2004]. Wood et al. [2004] found that the thermal expansion coefficient is significantly affected by the ferromagnetic to paramagnetic transition above the Curie temperature. In this study, we have determined the thermal expansion coefficient of Fe3C up to 20 GPa and 1273 K, using a T-cup device and synchrotron x-ray diffraction techniques at beamline 13-ID of the Advanced Photon Source. Our results place constraints on the abundance of carbon the Earth's inner core. This work is supported by NSF EAR 06-09639. References: Gao et al. (2008), Geophys. Res. Lett., doi:10.1029/2008GL034817. Li, J. et al. (2002), Phys. Chem. Miner., 29(3), 166-169. Scott, H. P. et al. (2001), Geophys. Res. Lett., 28, 1875-1878 Vocadlo, L., et al. (2002), Earth Planet. Sci. Lett., 203(1), 567-575. 347. Wood, B. J. (1993), Earth Planet. Sci. Lett., 117(3-4), 593-607. Wood, I. G. et al. (2004), J. Appl. Crystallogr., 37, 82-90.

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