Anion self-diffusion normal to (1¯1•2) was measured in single crystals at 1585 to 1840C, in vacuum, by using radiotracer methods. The diffusivity in pre-annealed crystals could be described by:

D (cm2/s) = 6.4 x 105 exp[-188(kcal/mol)/RT]

The diffusion was attributed to an extrinsic vacancy mechanism. Crystals with surface damage exhibited enhanced diffusion.

D.J.Reed, B.J.Wuensch: Journal of the American Ceramic Society, 1980, 63[1-2], 88-92

The best linear fits to the solute diffusion data ([430] to [437]) yield:

O: Ln[Do] = 0.20E – 24.5 (R2 = 0.99); O(gb): Ln[Do] = 0.37E – 45.4 (R2 = 0.96)