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

Dobson, DP; Crichton, WA; Bouvier, P; Vocadlo, L; Wood, IG; (2003) The equation of state of CsCl-structured FeSi to 40 GPa: Implications for silicon in the Earth's core. Geophysical Research Letters , 30 (1) , Article 1014. 10.1029/2002GL016228. Green open access

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Abstract

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 Angstrom, 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.

Type: Article
Title: The equation of state of CsCl-structured FeSi to 40 GPa: Implications for silicon in the Earth's core
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2002GL016228
Publisher version: http://dx.doi.org/10.1029/2002GL016228
Language: English
Additional information: Copyright 2003 by the American Geophysical Union
Keywords: Neutron powder diffraction, Situ x-ray, High-pressure, Epsilon-fesi, Thermal-expansion, Crystal-structure, Iron, Phase, Compressibility, Calibration
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/155360
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