Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pepi..172..289b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 172, Issue 3-4, p. 289-298.
Physics
1
Scientific paper
A thermodynamic model was developed for the Fe Si solid phases and applied to the calculation of high-pressure phase equilibria and thermophysical properties of Fe Si alloys. The model is based on integration of available CALPHAD (CALculation of PHAse Diagrams) description for the Fe Si system at ambient pressure with a composition-dependent equation of state, the parameters of which were fitted to available experimental data. At inner-core pressures and temperatures a two-phase structure is predicted, consisting of almost pure hcp-Fe and a stoichiometric CsCl-structured FeSi. Other outcomes of the model include predictions of pressure-enhanced B2 ordering in α-Fe Si alloys and an anomalously high thermal expansion of the CsCl-structured FeSi compound at ambient pressure, connected with temperature-effect on its degree of order.
Brosh E.
Makov Guy
Shneck Roni Z.
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