Transport coefficients in superionic α-AgI

Abstract

Abstract.A phenomenological theory is given for the time dependence of the relaxation process of an tx-AgI sample which has been previously polarized by the application of a voltage. The electromotive force caused by the internal electric field due to the polarized charge distribution is given by a series of exponential terms as a function of Dt, with D being the effective diffusion constant and t the time. The diffusion constants are obtained at several temperatures. In addition, the AC conductivity was measured for the same specimen. The results are analyzed with the help of a generalized Drude theory. Using both the results of the diffusion constant D and the AC conductivity, deviations from the Nernst-Einstein's relation are derived. Furthermore, computer simulations on these quantities were carried out by using well-established pairwise potentials. The agreement is satisfactory.

A theory of electrical conductivity of molten salt

“…However, the theory advanced here may be applicable for electrolyte solutions without any ionic hydration and even for superionic conductors, 16 if the pairwise potentials and pair distribution functions are known. …”