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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Equivalent electrical circuit proposed for the specimen under test. (b) Some specific formulations selected for the impedance spectroscopy. Modulus and phase impedance, in (c) and (d) respectively, evaluated in the frequency range of 100 Hz–1 MHz.