Compressibility and partial structure factors in the zero-wavevector limit of liquid copper-tin alloys

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Abstract
Results are presented for the velocity of sound for liquid Cu-Sn alloys accurate to 0.2% for temperature up to 1400 degrees C. The adiabatic and isothermal compressibilities are calculated from these data plus other thermodynamic data. The almost linear dependence on composition of the isothermal compressibility is not predicted by a simple extension to alloys of the Ascarelli model for the compressibility of pure metals. The partial structure factors at zero wavevector aij(0) are calculated from available thermodynamic data and are found to be strongly dependent on composition. Comparison with the aij(0) calculated from models of binary mixtures shows that the composition dependence arises both from the size difference and the finite interaction between the Cu and Sn components. It is deduced from the aij(0) that Cu-Sn correlations are favoured over Cu-Sn correlations for compositions centred around 75 at% Cu.