Abstract
The system Cu-F-O was assessed with CALPHAD technique using computerized optimization procedure (PARROT). Two solid phases CuFe2O4 and Fe3O4 forming solid solution at high temperatures were modeled with compound energy formalism. Presence of Cu1+ on tetrahedral sites in the samples with compositions close to CuFe5O8 reported in the literature was taken into account. The second ternary compound, CuFeO2, was modeled as a stoichiometric phase. For the liquid phase, an ionic two-sublattice model was used. In total 17 adjustable parameters were optimized (9 for the spinel phase, 2 for the delafossite and 6 for the liquid phase) to describe the experimental data. The consistent dataset, which gives a description of the properties from 923 to 1273 K, was obtained.
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