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

0.1MPa. An Arrhenius plot of the diffusivity values for pure Fe was linear down to temperatures as low as 473K.

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