Elastic properties of iron-rich hcp Fe-Mg alloys up to Earth's core pressures
2008 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 271, no 1-4, 221-225 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2008. Vol. 271, no 1-4, 221-225 p.
ab initio, elasticity, pressure, Earth's inner core
IdentifiersURN: urn:nbn:se:uu:diva-109968DOI: 10.1016/j.epsl.2008.04.003ISI: 000257835600021OAI: oai:DiVA.org:uu-109968DiVA: diva2:274908