The diffusion of H was studied in cylindrical and spherical specimens. The results could be described by:

spherical (206-606C):     D (cm2/s) = 6.5 x 10-3 exp[-0.40(eV)/kT]

cylindrical (200-650C):     D (cm2/s) = 5.4 x 10-3 exp[-0.40(eV)/kT]

P.Combette, P.Azou: Mémoires Scientifiques de la Revue de Métallurgie, 1970, 67, 17-33

The best linear fits to the solute diffusion data ([1063] to [1068], [1076] to [1078], [1080] to [1105], [1114] to [1117], [1120] to [1123]) yield:

Cu: Ln[Do] = 0.37E – 22.7 (R2 = 0.98); Fe: Ln[Do] = 0.33E – 21.4 (R2 = 0.998);

H: Ln[Do] = 0.66E – 11.5 (R2 = 0.46); Ni: Ln[Do] = 0.47E – 31.8 (R2 = 0.999);

O: Ln[Do] = 0.38E – 18.4 (R2 = 0.75)