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

doi:10.1016/j.ssi.2004.12.015

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 journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	2011-2022
Number of pages	12
Journal	Solid State Ionics
Volume	176
DOIs	https://doi.org/10.1016/j.ssi.2004.12.015
Publication status	Published - 15 Aug 2005

Keywords

impedance spectroscopy
equivalent circuit
R-CPE elements
non-linear fitting
LEAST-SQUARES
IMMITTANCE DATA
ADMITTANCE DATA
SPECTROSCOPY
CERAMICS

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10.1016/j.ssi.2004.12.015

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title = "Application of an alternative representation to identify models to fit impedance spectra",

abstract = "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.",

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AU - Ruiz-Morales, J C

AU - Marrero-Lopez, D

AU - Canales-Vazquez, J

AU - Nunez, P

AU - Irvine, J T S

PY - 2005/8/15

Y1 - 2005/8/15

N2 - 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.

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KW - impedance spectroscopy

KW - equivalent circuit

KW - R-CPE elements

KW - non-linear fitting

KW - LEAST-SQUARES

KW - IMMITTANCE DATA

KW - ADMITTANCE DATA

KW - SPECTROSCOPY

KW - CERAMICS

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DO - 10.1016/j.ssi.2004.12.015

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SN - 0167-2738

VL - 176

SP - 2011

EP - 2022

JO - Solid State Ionics

JF - Solid State Ionics

ER -

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

Abstract

Keywords

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