Thermo-physical properties of body-centered cubic iron-magnesium alloys under extreme conditions

Kádas, Krisztina (författare)

Ahuja, Rajeev (författare)

Johansson, Börje (författare)

(utgivare)

Abstract Ämnesord

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Using density functional theory formulated within the framework of the exact muffin-tin orbitals method, we investigate the thermo-physical properties of body-centered cubic (bcc) iron-magnesium alloys, containing 5 and 10 atomic % Mg, under extreme conditions, at high pressure and high temperature. The temperature effect is taken into account via the Fermi-Dirac distribution of the electrons. We find that at high pressures pure bcc iron is dynamically unstable at any temperature, having a negative tetragonal shear modulus (C’). Magnesium alloying significantly increases C’ of Fe, and bcc Fe-Mg alloys become dynamically stable at high temperature. The electronic structure origin of the stabilization effect of Mg is discussed in detail. We show that the thermo-physical properties of a bcc Fe-Mg alloy with 5% Mg agree well with those of the Earth’s inner core as provided by seismic observations.

Av författaren/redakt...: Kádas, Krisztina; Ahuja, Rajeev; Johansson, Börje; Eriksson, Olle; Vitos, Levente

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