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Phase Transition of FeO and Stratification in Earth’s Outer Core

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Science  11 Nov 2011:
Vol. 334, Issue 6057, pp. 792-794
DOI: 10.1126/science.1208265

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  1. Fig. 1

    Phase diagram of FeO. Green, red, and blue symbols represent the stabilities of B1, B2, and B8 structures, respectively. Circles, run 1; squares, run 2; triangles, Ozawa et al. (5). Stability of rhombohedrally distorted B1 (rB1) phase is from Fei and Mao (4). Crosses indicate the melting temperatures of B1 FeO (24), and the thin solid line represents its extrapolation by Simon’s equation. The inferred temperature profile inside Earth is shown in gray (2527). The locations of core-mantle boundary (CMB) and inner-core boundary (ICB) are indicated with arrowheads.

  2. Fig. 2

    XRD patterns obtained at (A) 280 GPa/300 K and (B) 324 GPa/4180 K in run 1 and at (C) ~210 GPa/300 K before heating, (D) 230 GPa/3400 K, and (E) 231 GPa/4410 K in run 2. hcp, hcp-Fe; Re, rhenium (gasket).

  3. Fig. 3

    Simulation results on core convection with varying of the Clapeyron slope and density jump for a fixed Rayleigh number. (A to D) Meridional cross-section of the core flow (arrows) and temperature (red, hot; blue, cold) averaged over longitude and time for models A1 and B2 to B4 (table S2). (E) The corresponding time-averaged radial profiles of the root mean square radial velocity and (F) horizontally averaged temperature with respect to the CMB temperature (7) for models A1 and B1 to B4 (table S2). Gray layer in (B) to (D) and vertical dashed lines in (E) and (F) represent the nominal range of the liquid structural boundary.

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