Electrical conductivities and densities of molten (Na—Tl)NO3 mixtures have been measured in the temperature range between 192°C and 400°C.
At all compositions the specific conductivities appear to be linear functions of the temperature. While the equivalent conductivities of the mixtures deviate negatively from additivity, the apparent activation energies ΔΕ (from the relation Λ =Λ0 · exp(—ΔE/R T) exhibit positive deviations from additivity.
This behavior is similar to that of other univalent binary systems with a common anion and seems to indicate that the polarization of the nitrate ion due to different cation sizes is the main cause of the additional hindrance to the electrical transport in mixtures.
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