Diffusivity of Ca⁴⁵ in Molten FeO-CaO-SiO² Slag Equilibrated with Solid Iron

Abstract

The self- and mutual-diffusivity of Ca⁴⁵ in FeO-SiO₂-CaO and FeO-SiO₂ melts equilibrated with solid iron have been measured in the temperature range 1 270 to 1 450°C using the capillary reservoir method with Ca⁴⁵ as the radioactive tracer. The results obtained are represented by D_s = (2.54 ± 0.50) exp (- 39 700 ± 10 000/RT) (cm²/s) for the self-diffusivity of Ca⁴⁵ in FeO 60 mass%-SiO₂ 33 mass%CaO 7 mass% melt and, D_m= (190 ± 10) exp (- 52 500 ± 10 000/RT) (cm²/s) for the mutual-diffusivity of Ca⁴⁵ in FeO 68 mass%-SiO₂ 32 mass% melt.