The chemical diffusivity coefficient of oxygen was measured from 1180 to 1520K in oxygen-deficient rutile, TiO2-x, by monitoring the electrical conductivity change after a step change in the chemical potential of oxygen. The data could be described by:

D(cm2/s) = 2.61 x 10-3exp[-9.2(kcal/mol)/RT]

Comparison of the calculated values of titanium self diffusion and published experimental values for air proved that the behaviour of the system near to the stoichiometric ratio could be formulated within the framework of a point defect model.

The Chemical Diffusivity of Oxygen in Oxygen Deficient Rutile for Compositions Close to TiO2. Baumard, J.F.: Solid State Communications, 1976, 20[9], 859-62