A NEW APPROACH TO MODELING ELECTRICAL-CONDUCTIVITY IN MOLTEN-SALT MIXTURES WITH COMMON ION - II

A variant of the combined, physico-chemical model proposed by us previ ously(1) for computing the electrical conductivity in molten salt mixt ures is described. The series-parallel dissociation. (sp), discussed i n this contribution, is based on the same theoretical premises, i.e. t he existence of an incomplete dissociation of the two salts and the po ssibility to calculate the melt resistance as a sum of contributions o f the individual components. The novelty of the sp model consists in t he way the ionic species are coupled together: the A(+) and B+ the fre e cations form a flux of positive charge carriers, while X- free anion s, originating from dissociation of either, A(+)X(-) or B+X-, form a f lux of negative ones. The molar conductivity values calculated accordi ng to this model are in good agreement with our own experimental data. A comparison between the values obtained by using the three possibili ties of ions coupling is made and the conclusion is that the present, sp, model is best suited for representing the electrical transport in molten salt systems with common ion.