Physics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71..974v&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 4, p. 974-983.
Physics
4
Scientific paper
Thermodynamic mixing properties and subsolidus phase relations of the rhombohedral carbonate system, (1 - x) · CaCO3 - x · MgCO3, were modelled in the temperature range of 623 2023 K with static structure energy calculations based on well-parameterised empirical interatomic potentials. Relaxed static structure energies of a large set of randomly varied structures in a 4 × 4 × 1 supercell of R3¯c calcite (a = 19.952 Å, c = 17.061 Å) were calculated with the General Utility Lattice Program (GULP). These energies were cluster expanded in a basis set of 12 pair-wise effective interactions. Temperature-dependent enthalpies of mixing were calculated by the Monte Carlo method. Free energies of mixing were obtained by thermodynamic integration of the Monte Carlo results. The calculated phase diagram is in good agreement with experimental phase boundaries.
Allan Neil L.
Burton Benjamin P.
Gale Julian D.
Vinograd Victor L.
Winkler Björn
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