Determination of the viscosity of molten salts by a capillary method. The system cadmium chloride-cadmium bromide

Abstract

The knowledge of the viscosity of molten salts and their mixtures is important (1) for testing recent theories by Eyring and by Frenkel, and (2) for confirming or modifying conclusions regarding the constitution of certain molten salt mixtures which were investigated by Bloom & Heymann. A capillary method based on the Ubbelohde-Bingham principle has been adapted to the conditions at high temperature. The main feature of the method is an automatic electric recording device, involving a balanced Wheatstone net with amplifier and an electric clock. The isotherms of viscosity plotted against molar fraction in the system CdCl 3 -CdBr 2 are linear. The activation energy of viscosity is 1.6 to 1.8 times as great as the activation energy of ionic migration.