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Critical consideration on the interpretation of impedance plots

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Author: Leur, R.H.M. van de
Institution: Kunstoffen en Rubber Instituut TNO
Source:Journal of Physics D: Applied Physics, 8, 24, 1430-1435
Identifier: 231571
Keywords: Dielectric Materials · Electric Properties · Mathematical Transformations · Resistors · Impedance Plots · Kramers-Kronig Transforms · Electric Measurements


The electrical response of dielectric materials is often graphically represented by means of a plot in the complex impedance (or admittance) plane. In many cases these impedance plots are semicircles. An equivalent circuit consisting of a capacitor (or a constant phase element) and two resistors is often used to describe such a semicircle. It is shown here that even if the experimental data are lying on such a semicircle they do not necessarily correspond to that equivalent circuit because of a different frequency dependency. In addition it is shown that the Kramers-Kronig transforms can be very helpful but are not decisive for the determination of whether experimental errors are made.