Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 21, Pages 6218-6227Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.10.065
Keywords
Impedance spectroscopy; Niobium oxide; Human stratum corneum; Constant-phase element; Young model; Time-constant distribution
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Two different mathematical formulas for estimating effective capacitance from Constant-Phase-Element (CPE) parameters, taken from the literature, are associated unambiguously with either surface or normal time-constant distributions. Application to different systems are used to illustrate the importance of using the correct formula that corresponds to a given type of distribution. Experiments and simulations are used to show that the effective capacitance obtained for a normal distribution yields correct values for the film thickness under conditions where the local resistivity does not vary significantly. When the local resistivity varies considerably over the thickness of a film, the experimental frequency range may preclude observation of the capacitance contribution of a portion of the film, resulting in under prediction of the film thickness. (C) 2009 Elsevier Ltd. All rights reserved.
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