Internal Mobilities in the Molten Binary System (K,Rb)NO3

Abstract

Ratios of internal cation mobilities in the molten binary system (K,Rb)NO3 have been measured with the Klemm method in a wide range of concentration (0.0537 < χRb< 1.00; χRb denotes mole fraction of RbNO3) and temperature (603 K < T < 783 K). From these and available data on the densities and conductivities, the internal mobilities of the two cations, bK and bRb, have been calculated. At high temperature and high ;cRb, the Chemla effect has been observed, whereas in previous similar experiments * the Chemla effect had not been observed. Except for xRb > 0.9, bK can be expressed by bK = [A /(V - V0)] exp (- E/RT), where V is the molar volume; A, E and V0 are constants having almost the same values as in the molten binary system (K,Cs)NO3.