Hydrogen solubilities and permeabilities in un-oxidized and partially internally oxidized fcc Pd-Fe and (Pd0.77Ag0.23)1-xFex alloys (393-523 K)

Hydrogen solubilities have been measured for a series of Pd-Fe alloys in the temperature range from 393 to 523 K. From these equilibrium data the standard partial thermodynamic parameters at infinite dilution of H, Delta H-H degrees and Delta S-H degrees have been obtained and the former becomes less negative, and the latter more negative, with increase of X-Fe. H diffusion parameters have been determined in the Pd-Fe alloys (393-523 K). D-H decreases and E-D increases with X-Fe while the pre-exponential factors D-H degrees do not change significantly. The dependence of D-H and E-D on H content have been determined for several of the Pd-Fe alloys and the former decreases and the latter increases with the H contents. (C) 2009 Elsevier B.V. All rights reserved.