Application of an alternative representation to identify models to fit impedance spectra

J C Ruiz-Morales, D Marrero-Lopez, J Canales-Vazquez, P Nunez, J T S Irvine

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The aim of this work is to improve a new alternative representation of impedance data proposed in a previous communication that greatly facilitates identification of the number of contributing elements and to use this approach to provide starting parameters for non-linear least squares fitting. This alternative representation allows estimation of the number of processes involved in the impedance spectra with a greater degree of confidence and to discriminate overlapped processes within a factor of 3 in their relaxation frequencies for processes with similar strength, using a model constituted by R-CPE elements.

The starting parameters for the non-linear fitting can be obtained from the equations proposed for the simplified behaviour of the impedance data. Additionally two types of plots are proposed to get a further rough estimation of the resistance and capacitance values.

The approach was tested with a simulated and an experimental case. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)2011-2022
Number of pages12
JournalSolid State Ionics
Publication statusPublished - 15 Aug 2005


  • impedance spectroscopy
  • equivalent circuit
  • R-CPE elements
  • non-linear fitting


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