Solubility of hydrogen in Pd-Dy-Ni ternary alloys

The hydrogen solubility properties of solid-solution ternary Pd1-x-yDyxNiy (x = 0.020, 0.040; y = 0.0555, 0.111) alloys are investigated in the ranges 473 ≤ T(K) ≤ 873 and 0.05 ≤ P(bar) ≤ 25 respectively. From the lattice parameters of the alloys and the thermodynamic parameters of the alloy-hydrogen system, it has been found that the hydrogen solubility properties of these alloys are determined mainly by electronic effects. The relative partial molar enthalpy in the two-phase region implies that hydrogen atoms have a preference towards occupation of the interstitial sites surrounded mostly by Ni atoms.