An investigation was made of the electromigration of H and D in -Fe of 3N8-purity. An Fe wire was connected to 2 volumes of gaseous H at identical pressures. When a direct current was passed through the wire, the resultant electrotransport resulted in a flow of H from one volume to the other. This was measured, and was used to deduce the effective charge of the dissolved H or D (table 43). In all cases, the interstitial solute migrated to the cathode. The deduced charges in transport were positive and independent of, or only slightly dependent upon, the temperature. They were markedly larger for the heavier mass. The results were interpreted in terms of a predominant momentum transfer between electron holes and the activated complexes of the elementary diffusion step.

R.A.Oriani, O.D.Gonzalez: Transactions of the Metallurgical Society of AIME, 1967, 239[7], 1041-6