Estimation of Solute Activity Coefficients at Infinite Dilution and Interaction Parameters of Hydrogen, Sulphur and Oxygen in Copper Solutions

概要

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The activity coefficients of a solute at infinite dilution in 23 copper solutions have been estimated by applying a recently developed theoretical equation for metallic solutions. Good agreement between the calculated and experimental values was found with over 90% reliability in the prediction of the correct sign. The agreement between the absolute values is also reasonable, considering that only fundamental physical quantities (hard sphere diameter, atomic volume and Miedema's molar heat of solution at infinite dilution of the constituent elements) are employed for computation. The interaction parameters of hydrogen, sulphur and oxygen in 75 ternary copper solutions, have also been calculated in a similar manner to the case of the solute activity. Moderately good agreement was observed between the calculated and the available measured values of 44 cases. Better agreement was obtained when the molar heat of solu tion of oxygen at infinite dilution calculated from Fitzner's semi-empirical equation was used rather than Miedema's estimation which may not be as sufficiently effective when applied to a non-metallic element.
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