The ac-impedance of compressed powders of the ion conducting zeolites chabazite and 13X has been measured. The porosity of the samples was changed by applying an external pressure. The impedance diagrams were suppressed semicircles. The impedance as well as the suppression angle decreased with increasing relative density. This shows that the particle-particle contact gives a significant contribution to the overall impedance. The frequency dependency of the current constriction at contact points between particles is described by a simplified equivalent network. The analytical expression is analogous to an equation for the impedance of fractal interphases leading to a constant phase angle element in the equivalent diagram.
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Skou, E.M., Jacobsen, T. A model for the frequency dispersion of the impedance of compressed powders of ionic conductors. Appl. Phys. A 49, 117–121 (1989). https://doi.org/10.1007/BF00615474