Abstract
The temperature variation of the solubility of hydrogen in rhodium, ruthenium, iridium and nickel in equilibrium with H 2-gas at 1 atm pressure has been measured by a technique involving saturating the solvent metal with hydrogen, quenching and analyzing in resultant solid solutions. The solubilities determined are small (atom fraction of H is in the range 5 × 10 −4−10 −5) and the results are consistent with the simple quasi-regular model for dilute interstitial solid solutions. The relative partial enthalpy and excess entropy of the dissolved hydrogen atoms have been calculated from the solubility data and compared with well-known correlations between these quantities.
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