Thermodynamic properties of liquid Ag-Li alloys

• EMF measurements of solid and liquid Ag-Li alloys.
• Temperature dependence of EMFs determined.
• Partial excess Gibbs energy and entropy and partial mixing enthalpy of Li obtained.
• Optimization of the available experimental data by Redlich-Kister equation.
• Comparative studies of the measured and calculated data.

The electrochemical concentration cell method was used in the measurements of the activities of Li in the Ag-Li liquid and solid alloys. Activity measurements were performed with the use of electrochemical cells with liquid LiCl-LiF and LiCl-KCl electrolytes for 9 alloys in the xLi concentration range from 0.1 to 0.9 and at temperatures between 643 K and 916 K. The linear temperature dependencies of EMF of the Ag-Li alloys were observed and described by the equation EMF(T) = a + bT. The calculated partial thermodynamic functions of Li showed negative deviations from the ideal behaviour. With the application of all the available literature thermodynamic data, the interaction parameters of the Redlich-Kister equation for the liquid Ag-Li phase were worked out with the use of the least square method. The partial and integral Gibbs energies, entropies and enthalpies were calculated and presented in tables and figures. Additionally, the concentration-concentration partial structure factors for the ideal and real Ag-Li solutions were calculated and graphically presented.