The diffusion of D in the amorphous and crystalline phases was studied (figure 11). No sign of He permeation was detected in either type of material, whereas D diffused readily as protons, rather than as molecules. The D permeability in the amorphous material was slightly lower than that in the crystalline material. It was concluded that surface films on the as-received material had a marked effect upon the permeation behavior.

Gas Migration in an Amorphous Metal. J.E.Shelby: Journal of Non-Crystalline Solids, 1983, 56[1-3], 207-12

Figure 11

Diffusivity of D in Crystalline Fe40Ni40P14B6

(open squares: vacuum ambient, filled squares: air ambient)