EMF measurements and thermodynamic description of the Pb-Sn-Zn liquid phase

An electrochemical cell *Zn | Zn²⁺ in LiCl, KCl | Pb _xSn_yZn_z has been made to measure the activity of zinc in the liquid phase of the ternary Pb-Sn-Zn and to determine the liquid miscibility gap. In this paper we present an assessment of the ternary Pb-Sn-Zn system. An optimization of the liquid phase based on the description of the Pb-Sn and Sn-Zn systems by Ohtani et al. Lee and our work on Pb-Zn, has been carried out taking into account available thermodynamic and phase diagram data. All ternary phases are described by the Redlich - Kister - Muggianu model. The optimized coefficients obtained and the calculated phase diagram are presented.