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Pressure-composition-temperature relationships are presented for the titanium-cobalt + hydrogen and the titanium-nickel+hydrogen systems for the ranges 10 kPa to 2MPa and 325 to 600K.The TiCo + H system exhibits three distinct two-phase regions, whereas the TiNi+ H system contains no two-phase regions in this range of temperatures and pressures. Values for the relative partial molar enthalpy and entropy have been obtained from the equilibrium data.

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The enthalpy of hydrogen at infinite dilution in palladium alloys has been calculated using a model in which the interstitial volume available to hydrogen atoms is kept constant. Under these conditions it is found that alloying elements are divided into two groups. Transition elements increase the enthalpy and non-transition elements decrease the enthalpy of hydrogen relative to palladium. These results are interpreted in terms of variations in the localised electronic properties of palladium atoms due to interactions with nearest neighbour metal atom additives.