Internal Cation Mobilities in the Molten Systems (Ag, Rb)N03 and (Ag, Cs)N03 Remeasured by the Klemm Method

Internal mobility ratios in the molten binary systems (Ag,Rb)NOa and (Ag,Cs)NOa have been measured by Klemm's countercurrent electromigration method at various temperatures and compositions. From these and the available data on the densities and conductivities, the cation internal mobilities b have been calculated. Over the investigated regions of temperature and composition b\g is greater than bRh and bCs. The internal mobility of Ag is well expressed by bAg = [A/{V — K0)] • e x p { E / R T ) , where V is the molar volume of the mixtures, A, V0, and E being constants nearly independent of the coions. A comparison of the present data with those previously obtained by the EMF method certifies that the Klemm method yields more precise data.