Calorimetric Investigations of Liquid Alkaline Earth Metal Alloys

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Abstract
The concentration dependences of the enthalpy of mixing of liquid copper‐magnesium and calcium‐copper alloys have been determined, applying direct mixing calorimetry, in the temperature range between 1120 and 1225 K. The enthalpies of mixing are discussed in connection with known thermodynamic quantities and the asymmetrical concentration course obtained can be described by an association model. Systematic comparison is carried out between the experimentally obtained enthalpies of mixing – together with other recent experimental data – and those obtained according to the Miedema model. The concentration dependence used in the model is not able to describe the results of alloy melts with strong compound formation tendency. The enthalpy of mixing can be calculated in nearly 40% of the systems investigated with less than 30% error and in 64% with an error less than 2.5 kJ mol−1.