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The equation of state of CsCl‐structured FeSi to 40 GPa: Implications for silicon in the Earth's core
Author(s) -
Dobson David P.,
Crichton Wilson A.,
Bouvier Pierre,
Vočadlo Lidunka,
Wood Ian G.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl016228
Subject(s) - materials science , equation of state , synchrotron radiation , earth (classical element) , core (optical fiber) , silicon , compressibility , synchrotron , inner core , powder diffraction , diffraction , rare earth , thermodynamics , crystallography , chemistry , physics , composite material , optics , metallurgy , mathematical physics
We have measured the compressibility of CsCl‐structured FeSi to 40 GPa by X‐ray powder diffraction using synchrotron radiation. A third order Birch‐Murnaghan equation of state fit to the experimental data yields V 0 = 21.74 ± 0.02 Å, with a K 0 of 184 ± 5 GPa and K ′ 0 = 4.2 ± 0.3. The measured density and elastic properties of CsCl‐FeSi are consistent with silicon being a major element in the Earth's core.