The permeation of D was studied by using the gas-phase breakthrough technique at between 100 and 500C, and pressures of between 10Pa and 100kPa. It was found that the data could be described by the Arrhenius parameters:

log[Do (m2/s)] = -4.29, E (eV) = 0.54

log[Po (mol/s m Pa½)] = -7.95, E (eV) = 0.38

The occurrence of D-trapping within the alloys appeared to affect the bulk diffusivity values.

D.J.Mitchell, E.M.Edge: Journal of Applied Physics, 1985, 57[12], 5226-35

Table 109

Diffusivity of Cs in Stainless Steel