INFORMATION ON IONIC BOUNDARY EFFECTS BY A NOVEL PENETRATION IMPEDANCE TECHNIQUE

A novel variant of the impedance technique is developed to study conta ct problems. For this purpose the contact under investigation is coate d with a dielectric layer through which the impedance is measured. Wit h decreasing frequency more and more of the conducting material in con tact with the electrode is detected. In this way not only a significan t characterisation of the interface but also a spatial resolution is a chieved. The main emphasis of this paper is on the experimental part a nd the special advantages of this mode of measurement. Nonetheless, th e theoretical background is concisely presented. The method is applied to the Ag/AgCl interface. Results are discussed in the light of ionic space charges.