Interpretation of impedance spectra based on local minima of imaginary Z vs frequency
authors Abrantes, JCC; Ferreira, AAL; Horovistiz, AL; Frade, JR
nationality International
journal ELECTROCHIMICA ACTA
author keywords impedance spectroscopy; imaginary part; grain boundaries; relaxation frequency; capacitance
keywords BOUNDARY DEFECT CHEMISTRY; ACCEPTOR-DOPED TITANATES; GRAIN-BOUNDARIES; CERAMICS; CONDUCTIVITY; SPECTROSCOPY; LAYER; SR0.97TI1-XFEXO3-DELTA; REPRESENTATIONS; POLYCRYSTALS
abstract Impedance spectra have been analysed based on interpretation of minima of the imaginary part of impedance vs frequency. One derived useful relations and used simulated examples to illustrate how this method can be applied. The bulk relaxation frequency, bulk capacitance and grain boundary capacitance can be extracted from the values of imaginary and real impedance parts at the minimum of Z '', and corresponding frequency. The proposed relations are also used to analyse impedance spectra obtained for ceramic samples of Yb2Ti2O7-based materials. The consistency of the analysis is also examined for cases when the representation of imaginary part of impedance vs real impedance shows a significantly depressed arc. This can be interpreted as resulting from distribution of relaxation frequency values. (c) 2008 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2008
volume 53
issue 28
beginning page 8222
ending page 8227
digital object identifier (doi) 10.1016/j.electacta.2008.06.029
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000259835300018
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journal impact factor 6.215
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