The equation of state of CsCl‐structured FeSi to 40 GPa: Implications for silicon in the Earth's core | Zendy

Dobson David P. | Zendy; Crichton Wilson A. | Zendy; Bouvier Pierre | Zendy; Vočadlo Lidunka | Zendy; Wood Ian G. | Zendy

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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.

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