Modeling of Finite Diffusion Impedance
by RC TwoTerminal Circuit

N. A. Sekushin^z

Institute of Chemistry of Komi, Scientific Center, Ural Division, Russian Academy of Sciences
Pervomaiskaya 48, Syktyvkar, Russia

Received February 26, 2009

Abstract—The Maxwell model consisting of three series capacitive circuits (SCCs) was employed for con-
structing an equivalent circuit of finite diffusion impedance (BW). The parameters of a low-frequency SCC were
determined using a power series expansion of frequency dependences of BW capacitance and conductivity. All
the further SCCs are calculated on the basis of the coincidence between BW and Warburg impedance at high-
frequencies. Exact formulas are presented that allow extending an equivalent circuit by adding new SCCs,
which is necessary for extension of the frequency range, in which the model and BW yield similar results.

Key words: equivalent circuit, two–terminal circuit, Warburg impedance, finite diffusion impedance, series
capacitive circuit, conductivity, capacitance

DOI: 10.1134/S1023193510010167

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