The oxygen-ion self-diffusion coefficient was determined for monocrystalline SrTiO3 between 825 and 1525C. The rate of exchange between O gas enriched with 18O, and solid single crystal plates and spheres, was measured. Diffusion rates for annealed crystals were independent of the O pressure between 15 and 570torr at 1400C and probably at lower temperatures. Below 1200C, oxygen ion diffusion depended upon prior heat treatment and dislocation density. For a dislocation density of ∼1.4 x 106/cm2, the temperature dependence of the diffusion coefficient was represented by:

D(cm2/s) = 1·6 x 10-7 exp[-15.5(kcal/mol)/RT]

between 825 and 1200C. For a dislocation density of ∼6.6 x 105/cm2, the diffusion coefficient was represented by:

D(cm2/s) = 1.2 x 10-5 exp[-29.3(kcal/mol)/RT]

between 850 and 1525C.

A.E.Paladino, I.G.Rubin, J.S.Waugh: Journal of Physics and Chemistry of Solids, 1965, 26[2], 391-7