Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 271, Issue 1-4, Pages 221-225Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2008.04.003
Keywords
ab initio; elasticity; pressure; Earth's inner core
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Using density functional theory formulated within the framework of the exact muffin-tin orbital method, we investigate the elastic properties of hexagonal closed-packed Fe-Mg alloys, containing 5 and 10 at.% Mg, up to pressures of the Earth's inner core. We demonstrate the effect of Mg alloying on the hexagonal axial ratio, elastic constants, density and sound wave velocities. We find that 10% Mg alloying decreases the shear modulus of iron by 23% and reduces the transverse sound velocity, nu(s) by 12% at core pressures. Although it is debated whether or not Mg can partition into the core, our results support Mg as a candidate light element in the core. (C) 2008 Elsevier B.V. All rights reserved.
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