Interdiffusion in the Fe2O3-TiO2 system was investigated by the diffusion couple method at 1323 to 1473K. The diffusion concentration curves of Ti4+cations were obtained by electron probe microanalysis, according to which the Boltzmann-Matano method optimized by Broeder was used to calculate the interdiffusion coefficients. The interdiffusion coefficients increased almost linearly with the mole fraction of Ti4+ cations increasing, and they were in the range of 10-12-10-11cm2/s. The increase in temperature could also lead to an increase in the interdiffusion coefficients at a constant concentration of Ti4+ cations. It was also found that the thickness growth of the diffusion layer obeyed the parabolic rate law.

Interdiffusion in the Fe2O3-TiO2 System. Ren, Z.S., Hu, X.J., Li, S.Y., Xue, X.X., Chou, K.C.: International Journal of Minerals, Metallurgy and Materials, 2013, 20[3], 273-8