The diffusion of H in 4N-purity Al could be described by:

D (cm2/s) = 4.58 x 10-2 exp[-8.8(kcal/mol)/RT]

M.Ichimura, M.Imabayashi, M.Hayakawa: Nippon Kinzoku Gakkaishi, 1979, 43[9], 876-83