Elastic properties of iron-rich hcp Fe Mg alloys up to Earth's core pressures

Details Elastic properties of iron-rich hcp Fe Mg alloys up to Earth's core pressures Elastic properties of iron-rich hcp Fe Mg alloys up to Earth's core pressures

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008e%26psl.271..221k&link_type=abstract

Earth and Planetary Science Letters, Volume 271, Issue 1-4, p. 221-225.

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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, vS 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.

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