Ab initio study of the composition dependence of the pressure-induced spin transition in the (Mg1-x,Fex)O system

Details Ab initio study of the composition dependence of the pressure-induced spin transition in the (Mg1-x,Fex)O system Ab initio study of the composition dependence of the pressure-induced spin transition in the (Mg1-x,Fex)O system

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316306p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 16, CiteID L16306

Physics

21

Geodesy And Gravity: Earth'S Interior: Composition And State (7207, 7208, 8105, 8124), Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Seismology: Mantle (1212, 1213, 8124)

Scientific paper

We present ab initio calculations of the zero-temperature composition dependent spin transition pressures in rocksalt (B1) (Mg1-x,Fex)O. We predict that the spin transition pressure decreases with increasing Mg content, consistent with experimental results. At high-pressure, we find that the effective size of Mg is smaller than high-spin Fe but quite close to low-spin Fe, consistent with a simple compression argument for how Mg reduces the spin transition pressure. We also show that the spin transition is primarily driven by the volume difference between the high-spin and low-spin phases, rather than changes in the electronic structure with pressure. The volume contraction at the transition is found to depend non-monotonically on Fe content. For FeO we predict a B1 -> iB8 transition at 63 GPa, consistent with previous results. However, we also predict an unexpected reverse transition of high-spin iB8 -> low-spin B1 at approximately 400 GPa.

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