A gas permeation technique was applied to disc-shaped samples (48mm

diameter, 0.1mm thickness), at 515 to 742K, using driving D pressures which ranged from 5 to 50kPa. The diffusivity could be described by:

D(m2/s) = 3.18 x 10-4exp[-88.1(kJ/mol)/RT]

There was evidence that D-trapping affected the observed diffusivity and solubility.

K.S.Forcey, A.Perujo, F.Reiter, P.L.Lolli-Ceroni: Journal of Nuclear Materials, 1993, 203[1], 36-42