HR: 0830h
AN: T11C-0400    [PDF]
TI: P-V-T equation of state of $\epsilon$-FeSi
AU: * Mibe, K
EM: k.mibe@gl.ciw.edu
AF: Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015 United States
AU: Fei, Y
EM: y.fei@gl.ciw.edu
AF: Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015 United States
AU: Frank, M
EM: T60MRF1@wpo.cso.niu.edu
AF: Department of Geology and Environmental Geosciences, Northern Illinois University, Davis Hall 312, Normal Rd., DeKalb, IL 60115 United States
AU: Watson, H
EM: h.watson@gl.ciw.edu
AF: Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015 United States
AB: The Earth_fs core is believed to consist of iron-nickel alloy together with some light alloying elements. Silicon has been suggested as a candidate for a possible light element in the core. In order to quantitatively understand the incorporation of silicon in the core, it is important to determine the solubility of Si in metallic iron at high pressure and its effect on the equation of state. We report new P-V-T data on $\epsilon$-FeSi. The in situ X-ray diffraction experiments were conducted using a Kawai-type double stage multi-anvil (SPEED-1500) installed at SPring-8, Japan. White synchrotron X-ray radiation was used as the incident X-ray beam and the energy-dispersive diffraction data was collected with a Ge solid state detector. The starting material is fine-grained powder of the synthetic $\epsilon$-FeSi. MgO powder or MgO + Au powder mixture were used as the pressure calibrants. The experimental conditions were up to 22 GPa and 1873 K. Unit-call parameters of iron silicide were determined by a least-squares fitting of the diffraction data. These data ware used to establish a thermal equation of state for iron silicide.
DE: 3919 Equations of state
DE: 3924 High-pressure behavior
DE: 3949 Thermal expansivity
DE: 8115 Core processes (1507)
DE: 8124 Earth's interior--composition and state (old 8105)
SC: Tectonophysics [T]
MN: 2003 Fall Meeting