Abstract
The solubility of hydrogen in PdPtH ternary solutions in equilibrium with hydrogen gas at atmospheric pressure was measured in the temperature range 625–1250 K and in PdPt binary solvents containing up to 61 at.% Pt. Concomitant elastic measurements provided data which enable the partial thermodynamic functions of the hydrogen atoms, deduced from the solubility measurements, to be converted to refer to a hypothetical PdPt lattice of constant specific volume. The resulting volume-corrected functions are discussed in terms of the cell model for ternary solutions and are shown to vary with temperature and platinum concentration in a manner in accord with this model. In contrast with Pd(Au, Ag, Cu)H solid solutions, the isobars for the PdPtH system always show a decreasing hydrogen solubility at any given temperature as the platinum content of the PdPt matrix increases, whereas isobars for the Pd(Au, Ag, Cu)H solutions show well-defined solubility maxima. This marked difference in thermodynamic behavior is almost entirely due to volume effects caused by changes in the host lattice and not to differences in the hydrogen-metal interactions in a rigid lattice system.
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