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X-ray diffraction study of the single-crystal elastic moduli of 
-Fe up to 30 GPa
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C., USA
Laboratoire des Sciences de la Terre, École Normale Supérieure de Lyon, Lyon, France
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C., USA
Laboratoire des Sciences de la Terre, École Normale Supérieure de Lyon, Lyon, France
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C., USA
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D. C., USA
Room temperature investigations of the single-crystal elastic moduli and anisotropy of the phase of iron are performed up to 30.3 GPa using the radial X-ray diffraction technique. The accuracy of the calculated elastic
moduli has improved compared to previous measurements using similar techniques because of an increase in accuracy of the measurement,
confinement of the sample to limit the effect of plasticity, and better calibration of the stress conditions. The aggregate
shear modulus that we obtain is in good agreement with a variety of other experimental deductions but differs from first-principles
calculations. The effects of the calibration of stress and micromechanical model on the deduction of elastic moduli and elastic
anisotropy are discussed in detail. The anisotropy we obtain has the same order of magnitude as first-principles calculations
but the direction is reversed, with a weaker amplitude that previous measurements.
Received 1 June 2004; accepted 11 February 2005; published 13 May 2005.
Citation:
(2005),
X-ray diffraction study of the single-crystal elastic moduli of -Fe up to 30 GPa,
J. Geophys. Res.,
110,
B05201,
doi:10.1029/2004JB003197.
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