Internal Cation Mobilities in the Molten Systems (Li-Na)NO3 and (Na-Cs)NO3

Abstract

Abstract For the molten salt systems (Li-Na)NO3 and (Na-Cs)NO3, relative differences of internal mobilities have been measured with the Klemm method. The internal mobilities, b, are calculated from these data and the available conductivity data. In the mixtures of the former system, bNa is always greater than bLi. In the latter system, the Chemla crossing point occurs. It is found that bLi and bNa in the binary alkali nitrate systems so far investigated are well expressed, except at small molar volumes, by b = {A/(V - V0)} exp(- E/RT) with constant A and E, where V is the molar volume and F° a constant for bu and nearly a constant for The values of bCs at equal concentrations of CsNO3 in the systems (Li-Cs)NO3 and (Na-Cs)NO3 are practically equal. The internal mobilities obtained are discussed in terms of free space, mutual ionic attraction and thermal agitation.