Space Charge Regions in Solid Two Phase Systems and Their Conduction Contribution — II Contact Equilibrium at the Interface of Two Ionic Conductors and the Related Conductivity Effect

Abstract In the space charge regions near the contact of two ionic conductors, distribution equilibria of the mobile ions — in addition to the bulk phase equilibria — have to be taken into account resulting in charged non‐stoichiometric regions with modified electric properties. The thermodynamics of the interfacial behavior are considered and the concentration profiles for the defects in two Frenkel disordered conductors, which are taken as an example, are calculated using the standard defect chemical potentials of the materials as parameters. The conduction contributions of the space charge regions in bicrystals and dispersions which may give rise to internal and external vacancy‐interstitial (v‐i‐) junctions are discussed. — The model is checked by the help of literature data on the conductivity of β‐AgI/AgBr dispersions.