Internal Mobilities in Molten Systems (Na-K)NO3 and (K-Cs)NO3

Abstract

Abstract Internal mobility ratios in melts of the binary systems (Na-K)NO3 and (K-Cs)NO3 have been measured with the Klemm method in a wide range of concentration and temperature. From these and the available data on densities and conductivities, the internal mobilities have been calculated. In both systems the Chemla effect has been observed at relatively high temperature. The internal mobilities of Na+ and K+ seem to be well expressed by b = [A/(V- V0)] exp(-E/RT) (V: molar volume; V0 , A and E are parameters) in the respective systems (Na-M)NO3 (M = K, Rb and Cs) and (K-M)NO3 (M=Rb and Cs). The internal mobilities in the binary alkali nitrate melts can be qualitatively rationalised in terms of the attraction effect, the free space effect and the agitation effect.