Abstract
The first solubility measurements of tritium (T) in Pd 1− z Ag z ( Z = 0.10, 0.20 and 0.30) alloys are reported in the temperature range 250 K to 733 K, the pressure range below 1 atm and the concentration range of 0.001 to 0.05 hydrogen-to-metal atom ratio. In addition, the pressure-concentration-temperature relationships of the stable hydrogen isotopes protium (H) and deuterium (D) have been determined using the same or similar samples under similar experimental conditions over the temperature range 250 K to 1300 K. Analytical expressions are given for the equilibrium constants and activity parameters so that the Gibbs free energies, enthalpies and entropies of solution of H, D and T in these PdAg alloys can be calculated. Using the assumption that there is only one kind of hydrogen site and that the only interaction between the alloy and hydrogen varies uniformly with alloy content, the ground state energies of hydrogen isotopes dissolved in these alloys are determined.
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