With the Klemm method internal mobility ratios of the two cations have been measured for melts of the binary system (Li, K ) NO3 over a wide range of temperature and composition, and their isotope effects have been determined near the eutectic composition. The Chemla effect has been observed. With increasing temperature the Chemla crossing point shifts, as expected, toward higher concentrations of the smaller cation. At very high concentrations of LiNO3 the mobility of K+ tends to decrease, which is attributed to the free space effect. For both Li+ and K+ the isotope effect increases with temperature.
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