Lattice and grain-boundary interdiffusion coefficients were deduced from the concentration distributions found for Zr-Hf interdiffusion in polycrystalline (Zr1-xHfx)O2-16Y2O3, with x = 0.020 or 0.100. The lattice interdiffusion coefficients could be described by:

D (cm2/s) = 3.1 x 10-2 exp[-391(kJ/mol)/RT]

and the grain-boundary diffusion parameters could be described by:

δD (cm3/s) = 1.5 x 10-6 exp[–309(kJ/mol)/RT]

at 1584 to 2116C.

Y.Sakka, Y.Oishi, K.Ando: Journal of Materials Science, 1982, 17[11], 3101-5