The electrical conductance of the molten salt systems PbCl₂ + NaCl, PbCl₂ + RbCl, and PbCl₂ + CsCl

Abstract

The specific conductances of molten mixtures of PbC1₂+MCl (M = Na, Rb, Cs) have been measured as functions of composition and temperatures from 800°C (or in some cases 850°C) to within a few degrees of the liquidus. The system PbCl₂+CsCl exhibits a pronounced maximum of activation energy for conductance at 0.67 mole fraction CsCl. Equivalent conductances of the systems have been calculated and have been plotted against atomic ratio of Pb/Cl. An attempt has been made to explain the conductance results on the basis of the transport theory of Adam and Gibbs. The results are best explained by the presence in the PbCl₂+RbCl and PbCl₂+CsCl systems of complex ions of formula PbCl₄^2-.