The interdiffusion of Cr2O3 and TiO2 was studied between 990 and 1520C over the range of concentrations for which the solid phase was a rutile solid solution. The concentration limits of this phase were determined. At low concentrations, the interdiffusion coefficient varied approximately as the chromium concentration but decreased again at higher concentration. The ratio of the diffusion coefficients, parallel and perpendicular to the rutile c-axis, decreased from 4.0 at 990C to 1.75 at 1520C.

Interdiffusion and the Solubility Limits of Cr2O3 in the Rutile Phase of TiO2. O’Keeffe, M., Ribble, T.J.: Journal of Solid State Chemistry, 1972, 4[3], 351–6

Figure 3

Diffusivity of Sc parallel to the c-axis of rutile

a: PO2 = 10-8atm, b: air