The Temperature Dependence of the Isotope Effect for Electromigration of Potassium Ions in Molten Potassium Nitrate

generally interpreted as an indication of "complex ions" (which is another way of saying that a simple model with only three ionic species is inadequate) . The small absolute value of r12 in the A g N 0 3 — K N 0 3 mixture makes the experimental uncertainty more important. Thus the positive value at 380 °C indicates that also the value at 340 °C should be (small and) positive (since increased temperature should lead to increased "dissociation") . The present investigation shows that dissolving small amounts of silver nitrate in lithium, sodium, and potassium nitrates creates mixtures with a very simple structure (a melt consisting of only three ionic species) while there is evidence of "complex ions" when silver nitrate is dissolved in rubidium and cesium nitrates.