EQUIVALENT-CIRCUIT ANALYSIS OF MIXED-CONDUCTOR ELECTRODE SYSTEM BY IMPEDANCE SPECTROSCOPY

Frequency dispersion of complex impedance on a mixed-conductor (MC) cell was analyzed in terms of an equivalent circuit. The new equivalent circuit for MC cell was proposed as a modification of that for an oxide-ion conductor cell, YSZ with electrodes. The new circuit with a resistive element due to the electron conduction of MC was added in parallel with the circuit for the ion conductor. Representative impedance plane plots are given for typical conditions of this model, and the shape and the overlapping situation of the impedance loci were studied.