Abstract
The tie lines delineating ion-exchange equilibria between NiFe 2O 4-NiCr 2O 4 spinel solid solution and Fe 2O 3-Cr 2O 3 corundum solid solution were determined at 900, 1000 and 1200°C by electron microprobe and energy dispersive X-ray analysis of oxide phases, using the flux-growth technique. The activities of the spinel components were calculated from the tie lines, assuming Temkin's ideal mixing in the corundum solid solution. The spinel phase can be expressed by a regular solution with negative deviations from ideality. The Gibbs free energies of mixing for spinel solid solution are discussed in terms of the cation distribution model, based on site preference energies and assuming random mixing on both tetrahedral and octahedral sites.
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