Palladium-tritium system

Abstract

First measurements of the pressure-composition-temperature relationship for the palladium-tritium system are reported for the pressure range $0.1l~pl~2$. bar, the composition range $0.02l~xl~0.65$ (for $x$ in $\mathrm{Pd}{\mathrm{T}}_{x}$), and temperature range $35l~Tl~125\ifmmode^\circ\else\textdegree\fi{}$C. The PdH and PdD systems have also been measured using the same sample under the same experimental conditions. The main conclusions are that ${p}_{{\mathrm{T}}_{2}}g{p}_{{\mathrm{D}}_{2}}g{p}_{{\mathrm{H}}_{2}}$ at equal concentrations and temperatures, ${x}_{\mathrm{T}}l{x}_{\mathrm{D}}l{x}_{\mathrm{H}}$ at equal pressures and temperatures, and that the $\ensuremath{\beta}\ensuremath{\rightarrow}\ensuremath{\alpha}$ transition enthalpies show a strong, and the entropies a negligible, isotope dependence.