Electrical conductivity of molten lithium chloride – dysprosium(III) chloride system compared to other alkali metal chloride – dysprosium(III) chloride and lithium chloride – lanthanide(III) chloride systems

Abstract

Electrical conductivity of not investigated yet molten binary system LiCl-DyCl3 has been determined in the temperature range 823–1073K. Temperature dependence of specific conductance of melts was fitted by the second order polynomial and molar conductivity by classical Arrhenius equation. The results were discussed in combination with the electrical conductivity data for other alkali metal chloride – dysprosium chloride and lithium chloride – lanthanide chloride melts. It was found that the lithium system differs from other alkali metal ones particularly in deviation from additivity rule (the maximum of deviation is significantly shifted to DyCl3-rich melt) and dependency of molar conductivity on the melt composition (for the lithium system conductivity regularly decreases with the increase of DyCl3 content whereas for other systems there are maxima of the first derivative of this dependence at xDyCl3=0.6–0.7), most likely due to the reduction of stability of dysprosium complex species by lithium cation.