Showing papers in "Surface & Coatings Technology in 1985"
TL;DR: In this article, a statistical thermodynamic approach towards the understanding of the nature of bondings in metal-hydrogen (M-H) systems is proposed on the basis of an a priori assumption of constant H-H interaction within the same phase at a given temperature.
Abstract: A statistical thermodynamic approach towards the understanding of the nature of bondings in metal-hydrogen (M-H) systems is proposed on the basis of an a priori assumption of constant H-H interaction within the same phase at a given temperature. The number of interstices available for occupation by hydrogen atoms in the condensed phase MHx is chosen so that this a priori assumption can be fulfilled. The discussions are presented in terms of the atomic partition function of hydrogen in MHx and of the interaction energy terms. The values of these estimated parameters are similar for metals belonging to the same group in the periodic table; this appears to be realistic in view of their similarities of electronic structure. This approach is also applied to hydride formation by a variety of alloys and intermetallic compounds as well as by pure metals. In addition, very dilute hydrogen solutions in metals are also analysed using this line of approach with the assumption of negligible H-H interaction.
23 citations
TL;DR: In this paper, a bielectrode cell was employed to determine the mass transport coefficients of hydrogen in annealed and deformed palladium membranes, and the diffusivity was evaluated as 3.41×10-11 m2 s-1 at 23°C with a concomitant activation energy QD as 23.0 kJ mol-1.
Abstract: A bielectrode cell was employed to determine the mass transport coefficients of hydrogen in annealed and deformed palladium membranes. In the annealed samples the diffusivity was evaluated as 3.41×10-11 m2 s-1 at 23°C with a concomitant activation energy QD as 23.0 kJ mol-1. The variation in diffusivity and chemical potential with concentration is shown for the deformed membranes.