The diffusivity of O was determined by using an electrochemical technique. The O-ion conductivity was measured under direct-current polarization and then converted into a diffusion coefficient by using a modified Nernst-Einstein equation. It was found that the data, at 412 to 800C, could be described by:

D (cm2/s) = 4.98 x 10-3 exp[-0.50(eV)/kT]

I.Kontoulis, B.C.H.Steele: Solid State Ionics, 1991, 47[3-4], 317-24

The best linear fits to the solute diffusion data ([473] to [487], [517] to [528]) yield:

Ag: Ln[Do] = 0.33E – 15.5 (R2 = 0.73); O: Ln[Do] = 0.69E – 13.2 (R2 = 0.998);

O(l): Ln[Do] = 0.42E – 9.4 (R2 = 0.98)