The interdiffusivity matrix of Fe2O3-CaO-SiO2 melt at 1693 to 1773 K

The diffusion couple method was used at 1693 to 1773 °K on liquid slags with their average compositon of 20 wt pct Fe₂O −₃−35 wt pct CaO-45 wt pet SiO₂. After diffusion runs for 40 min, the samples have been quenched to glassy state. The samples were sectioned, polished, and analyzed by a X-ray micro analyzer. The diffusivities matrix obtained from the penetration curves can be expressed by the following equations,D ³⁰ ₁₀₋₁₀ = 3.27 exp (−50000―RT)(cm²/s)D ³⁰ ₁₀₋₂₀ = -11.1 exp (−50000―RT)(cm²/s)D ³⁰ ₂₀₋₁₀ = 8.30 exp (−56300―RT)(cm²/s)D ³⁰ ₂₀₋₂₀ = 11.5 exp (−56200―RT)(cm²/s) where 10, 20, and 30 mean Fe₂O₃, CaO and SiO₃, respectively and the activation energies are in Cal per mol. The elements obtained satisfy the restriction derived from the second law of thermodynamics. The diffusion-composition paths obtained are consistent with the Cooper's parallelogram.