Relaxation spectra of the Warburg impedance and the constant-phase elements |
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Authors: | M G Astaf’ev |
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Institution: | (1) Moscow, Russia |
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Abstract: | It is shown that there is indissoluble connection of impedances of constant-phase elements (CPE) with the presence, in a system,
of a continuous spectrum of intrinsic frequencies inside a region where an impedance of CPE is observed. Such a connection
exists in objects of any nature. As a result, the inevitable presence of the minimum limiting relaxation frequencies in real
systems distorts the frequency characteristics of an ideal impedance of CPE in the zone where intrinsic frequencies are absent
(restricts CPE). A transition zone of frequency characteristics of restricted CPE is studied. A false effect of the deviation
of the CPE power index determined experimentally from a Nyquist plot from its true value is shown. A technique is proposed
for restoring true values of CPE power indices and estimating limiting frequencies of relaxation spectra lying by many orders
of magnitude lower than the minimum frequencies available for an experimental setup. |
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Keywords: | |
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