The serial sectioning technique was used to study the diffusion of 45Ca in pure material, and in large-grained samples which were doped with 600ppm of Ca. The data for the pure material, at 680 to 795C, could be described by:

D (cm2/s) = 1.3 x 10-1 exp[-1.55(eV)/kT]

The data for the impure material, at 360 to 500C, could be described by:

D (cm2/s) = 2.35 x 10-4 exp[-0.87(eV)/kT]

L.Slifkin, G.Brebec: Commission d’Energie Atomique Report CEA-R-3769, 1969