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With the Klemm method, ratios of internal mobilities in a ternary molten mixture (Li, Na, K) NO 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, b Li , b Na  and b K , 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 b K  at lower temperature may be attributed to the free space effect, b = {A/(V - V 0 )} · exp ( - E/RT), where V is the molar volume of the mixture and A, E and V 0  are parameters dependent on the cation of interest and independent of temperature and the sort of cocations.

Internal Cation Mobilities in the Ternary Molten System (Li, Na, K) NO 3 of the Eutectic Composition