Internal mobility ratios in the molten binary system KNO3- Ca0.5NO3 have been measured with the Klemm method in a range up to 50 mol% Ca0.5NO3. From these and available data on the densities and conductivities, the internal mobilities of K+ and Ca2+ ions (bK and bCa, respectively) have been calculated. With an increase of Ca2+ concentration, both bK and bCa decrease. The decrease of bK is presumed to be attributable to the “tranquillisation effect” caused by clustering of NO3- ions around Ca2+ ions due to the strong Coulombic interaction. The increase of bCa with increasing concentration o f K+ ions may be attributed to the agitation effect by K+ ions.
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