THE EFFECT OF CYCLING THROUGH THE HYDRIDE PHASE ON ISOTHERMS FOR FCC PD-RICH ALLOYS

The Pd-Ni, Pd-Co, Pd-Cr, Pd-Au, Pd-Rh, Pd-Mo and Pd-Pt fcc Pd-rich all oys have been found to exhibit large effects of cycling through the hy dride phase. The effect of cycling Pd-Mo alloys is noticeable even at a composition of X-Mo=0.02 whereas for Pd-Rh alloys it is not signific ant until X-Rh>0.10. The dependence of the effect of the cycling on al loy composition will be reported here for the alloy systems Pd-Cr and Pd-Mo. The effect of cycling for a Pd-Ag alloy has also been determine d. The temperature dependencies of the plateaux pressures of the cycle d and the annealed alloy forms are reported for the Pd0.95Cr0.05 alloy .