The diffusion coefficients of point defects in reduced rutile, following reduction under an ion-pumped vacuum of 4 x 10-9torr at 800 to 1100C, were studied. The data (table 16) could be described by:

c-axis: D(cm2/s) = 1.47 x 102exp[-2.4(eV)/kT]

a-axis: D(cm2/s) = 9.1 x 101exp[-2.4(eV)/kT]

The results were analyzed in terms of oxygen vacancies. From the orientation-dependence of the coefficients and the activation energies, it was concluded that these results constituted clear evidence for the presence of oxygen vacancies in reduced rutile and that their migration energy was 2.4eV.

Cation Self Diffusion in Titanium Monoxide. Iguchi, E., Yajima, K.: Journal of the Physical Society of Japan, 1972, 32[5], 1415-21

Figure 8

Ionic transport number in TiO2-x at 1050C