The behavior of H was determined by using the gaseous permeation method at 473 to 1073K, under partial pressures of between 0.01 and 0.1MPa:

D (cm2/s) = 7.43 x 10-3 exp[-10.5(kcal/mol)/RT]

Y.Yamanishi, T.Tanabe, S.Imoto: Transactions of the Japan Institute of Metals, 1983, 24[1], 49-58