Transport Properties in Molten Salts

Abstract

The partial conductivities in molten salts have been analyzed using a phenomenological theory and it was found that their ratio was expressed in terms of the inverse mass ratio of the constituents. This is confirmed by computer simulation for molten NaCl and Agl, when using proper pairwise potentials and the nonequilibrium molecular dynamics method.The diffusion constants for positive and negative ions in molten NaCl and Agl are also simulated. By using both results for the partial conductivities and the diffusion constants, it is found that the deviation from the Nernst-Einstein relation Δ is not unique but Δ + * Δ-Α new method has also been presented for experimentally deriving the diffusion constants D + and D~ in molten salts. Actual application has been carried out for molten Agl and the results are comparable to those obtained by computer simulation It is suggested that the AC measurement is useful for obtaining both Δ + and Δ".

Concentration Effects of Silver Ions on Ionic Conductivities of Molten Silver Halides

“…This increase of σ relates to higher Ag conductivities in the superionic phase than those in molten phase at immediately around T m . From experimental and theoretical studies on a self-diffusion constant of Ag, D Ag , of AgI beyond the transition point from α-phase to molten phase, D Ag in molten phase shows smaller value than that in superionic phase at around T m [32][33][34]. The addition of RbI into molten AgI reduces σ in the RbI concentration region less than 0.667.…”