INTERDIFFUSION OF SILVER ION IN MOLTEN ALKALI-METAL CHLORIDES

In order to clarify the relative importance of various factors for solute diffusion of impurity cations, the inter-diffusion coefficients of silver ion in molten alkali chlorides were determined by the capillary reservoir methods at the temperatures ranging from the melting points of solvent salts to 200 K above these points. The temperature dependence of the inter-diffusion coefficient of Ag** plus ion was well represented by an equation of Arrhenius type. The pre-exponential term and the apparent activation energy for diffusion were determined by the least square method. The polarization energy of anion, as well as the energy of the hole formation, was found to be an important factor in controlling the diffusive movement of solute cation in molten alkali metal chlorides.