ADMITTANCE SPECTROSCOPY OF SYSTEMS SHOWING LOW-FREQUENCY DISPERSION

The admittance spectroscopy of systems showing Low-Frequency Dispersion (LFD) is discussed in the light of available experimental evidence of this type of process which is very common in a wide range of materials. It is shown that the question of interfacial vs bulk nature of the LFD process is not necessarily simple to answer and this influences the interpretation in terms of impedance or admittance diagrams. Some theoretical models for the interpretation of LFD are briefly discussed, including a novel approach based on electrochemical interactions. © 1990.