Hydrogen solubilities and permeabilities in un-oxidized and partially internally oxidized fcc Pd-Fe and (Pd_(0.77)Ag_(0.23))_(1-x)Fe_x alloys (393-523 K)

摘要

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~o and DELTA S_H~o 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~o 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.