Raman spectroscopy, combined with the 16O-18O exchange technique, was applied to tetragonal polycrystals of material which contained 2.8mol% of Y2O3. It was found that the results could be described by:

D (cm2/s) = 1.82 x 10-1 exp[-33.2(kcal/mol)/RT]

at 700 to 950C. The diffusivity was also measured by using a gas-monitoring method during isotopic exchange reactions. The data which was described in this manner could be described by:

D (cm2/s) = 1.14 x 10-2 exp[-28(kcal/mol)/RT]

at 700 to 1165C. Good agreement was found between the data which were obtained by using the 2 methods.

B.K.Kim, S.J.Park, H.Hamaguchi: Journal of the American Ceramic Society, 1994, 77[10], 2648-52

The best linear fit to the solute diffusion data ([468] to [470]) yields:

O: Ln[Do] = 0.27E – 11.7 (R2 = 0.27)