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Using generalised circuits consisting of three basic elements (electrochemical resistors, electrical and chemical capacitors), the small signal response of mixed conductors is considered. Simple approximate circuits for polycrystals with grain boundaries that act as obstacles for ions, electrons or both are derived. It is shown that Warburg-type impedance can be induced also by grain boundaries, not...
Local conductivity of sintered AgCl polycrystals was studied using micro-contact impedance spectroscopy. The technique is based on the flux constriction effect, which involves probing of the sample solely in the vicinity of the microelectrode. By contacting the polycrystal surface at different points, we could distinguish between the grains and the highly conductive grain boundaries. Temperature-dependent...
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