Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Integral molar enthalpies of mixing were determined by drop calorimetry for Cu-Li-Sn at 1073 K along five sections xCu/xSn=1:1, xCu/xSn=2:3, xCu/xSn=1:4, xLi/xSn=1:1, and xLi/xSn=1:4. The integral and partial molar mixing enthalpies of Cu-Li and Li-Sn were measured at the same temperature, for Li-Sn in addition at 773 K. All binary data could be described by Redlich Kister-polynomials. Cu-Li shows an endothermic mixing effect with a maximum in the integral molar mixing enthalpy of ~5300 J.mol-1 at xCu = 0.5, Li-Sn an exothermic minimum of -37,000 J.mol-1 at xSn~0.2. For Li-Sn no significant temperature dependence between 773 K and 1073 K could be deduced. Our measured ternary data were fitted on the basis of an extended Redlich Kister Muggianu model for substitutional solutions. Additionally, a comparison of these results to the extrapolation model of Chou is given.