Thermodynamic properties of Li-Pb system

The integral mixing enthalpy of liquid Li-Pb alloys was measured with the use of the calorimetric technique. The experimental studies involved measurements at different temperatures: 817, 923, 1021 and 1023 K in the entire concentration range. The thermodynamic optimization was performed basing on the obtained results and the available literature data. The description of the excess Gibbs energy of temperature and composition was proposed with the use of a new model, which connects the polynomial and associated modelling. The obtained molar mixing enthalpy changes, excess Gibbs energy, and the molar excess entropy values are negative in the entire concentration range. Moreover, the existence of Li4Pb and LiPb associates in the liquid solutions was found, according to the analysis of the partial concentration structure factors (Scc(0)) and short range order (SRO) parameters.