Substitutional diffusion was measured in α-Zr monocrystals, and the diffusion profiles were analyzed by using Rutherford back-scattering. The measurements were performed parallel and perpendicular to the specimen c-axis (table 345). The main aim was to study the effect of Fe upon the diffusion of Pb at 1100K. Some preliminary data were also reported 872 and 1000K. The initial measurements at 1100K showed that the diffusivity decreased in the order: Ta – Hf – Pb. The specimens were then treated so as to reduce the Fe content (65 to 30ppm[at]) and the diffusion coefficients were re-measured. The diffusion coefficients fell by a factor of about 2 with decreasing Fe concentration. All of the D-values which were found at 1100K lay between 4 x 10-19 and 3 x 10-17m2/s.

G.M.Hood, T.Laursen, J.A.Jackman, R.Belec, R.J.Schultz, J.L.Whitton: Philosophical Magazine A, 1991, 63[5], 937-47