Internal Cation Mobilities in the Ternary Molten

With the Klemm method, ratios of internal mobilities in a ternary molten mixture (Li, Na, K)N0 3 of the eutectic composition (30-17-53 mol%) have been measured in the temperature range 473 K-673 K. The electric conductivity has been measured with a D. C. method. From these data the internal mobilities, bu, 6Na and bK, have been obtained on the assumption of additivity for the molar volume. In most cases, b is well represented by the following equation which is known to be valid in binary alkali nitrates. Negative deviations from this equation particularly for bK at lower temperature may be attributed to the free space effect, b = {A/(VV)} • exp ( E/RT), where V is the molar volume of the mixture and A, E and V° are parameters dependent on the cation of interest and independent of temperature and the sort of cocations.