Solid solutions of hydrogen in gold,silver and copper

The temperature variation of the hydrogen solubility of copper, silver, and gold in equilibrium with H₂-gas at atmospheric pressure has been measured. Values for the relative partial enthalpy and partial excess entropy of the interstitially dissolved hydrogen atoms have been estimated from the solubility data.The experimental data are compared with those of previous investigations. The partial entropy values obtained for, copper and silver show a ‘regular’ behavior when compared with partial entropies for other cubic metals having a small occludive capacity for hydrogen. The gold-hydrogen system is, however, anomalous and has a partial excess entropy which is essentially zero.