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The cationic internal mobilities of the (Na-Rb)NO 3  (over a large temperature range) and (Tl-Rb)NO 3  (at 325 °C) molten systems, have been determined. The trends of the mobility iso­therms of (Na-Rb)NO 3  do not change with temperature. The preexponential factors of the Arrhe­nius plots are nearly (within the experimental accuracy) independent of composition. The activa­tion energy of the Na +  mobility, passing from NaNO 3  to RbNO 3  , increases by about 0.8 kcal·mole -1 ; the activation energy of Rb +  passing from RbNO 3  to NaNO 3  decreases by about 0.4 kcal·mole -1 . The Tl +  and Rb +  mobilities in the (Tl-Rb)NO 3  system vary linearly with composition and are equal within ~ 5%. The mobility results in both systems confirm the validity of equations for the equivalent conductivity excesses previously described.

The Electrical Cationic Mobilities of (Na —Rb)NO 3 and (Tl — Rb)NO 3 Molten Mixtures