A gas permeation technique was applied to disc-shaped samples (48mm diameter, 0.1mm thickness), at temperatures ranging from 515 to 742K, using driving D pressures which ranged from 5 to 50kPa. It was found that the permeability obeyed an Arrhenius behavior,

(mol/sPa½m) = 8.32 x 10-8exp[-75.5(kJ/mol)/RT]

which was very similar to that reported for pure Mo. However, the solubility was found to be weakly exothermic. This was not often observed in the case of Mo. 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.

The Permeability, Diffusivity and Solubility of Deuterium in TZM. K.S.Forcey, A.Perujo, F.Reiter, P.L.Lolli-Ceroni: Journal of Nuclear Materials, 1993, 203[1], 36-42