The diffusion of H was investigated at 260 to 1000K by using electrochemical permeation and gas-phase permeation techniques. The temperature dependence of the diffusivity could be described by:

D (cm2/s) = 9.2 x 10-3 exp[-9.9(kcal/mol)/RT]

H.Hagi: Journal of the Japan Institute of Metals, 1983, 47[12], 1029-35

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)