Effect of permittivity on the ionic boundary layer upon protonation of lithium niobate

The paper presents the results of a numerical study of the behavior of proton exchange reaction products after they enter benzoic acid, which interacts with a lithium niobate crystal. The theoretical model based on the continuous media approximation considers the convective transfer and diffusion of positively charged lithium ions and negatively charged benzoate ions. Additionally, the possibility of their recombination with the subsequent formation of lithium benzoate molecules is taken into account. The results obtained correspond to stationary, uniform along the interface, profiles of the ion concentration and electric potential. In the process of establishment, benzoate ions form an ionic boundary layer. An analysis is made of the influence of the dielectric constant of the carrier liquid on its characteristics.