Thermodynamic properties of hydrogen and deuterium dissolved in palladium at low concentrations over a wide temperature range

Abstract

The equilibrium pressures of the Pd/H₂ and Pd/D₂ systems have been measured in the temperature range from –100°C to 350°C for values of H(D)-to-Pd, atomic ratio, in the approximate range from 0.0005 to 0.005. These data were obtained in an ultra-high vacuum apparatus with large samples of low surface area. Partial thermodynamic data have been obtained from these equilibrium data; a significant temperature dependence is reported for the relative partial molar enthalpies and entropies.