Abstract
The solid state reaction approach was used to prepare the (La0.7Ca0.3)(Mn0.5Fe0.5)1-xZrxO3 (where × = 0.1 and 0.5) system for use as a cathode in solid oxide fuel cells. The impedance and electrical properties have been investigated. The ac impedance spectra of the samples show a grain boundary contribution to total conductivity and diffusion controlled impedance. A wide range impedance spectroscopy research from 50 to 200 °C revealed both bulk and grain boundary effects. At higher temperatures, oxygen vacancies could be used as ionic charge carriers, indicating an Arrhenius-type thermally activated process. The hopping mechanism for electrical processes in the system was shown by the fluctuation in ac conductivity as a function of frequency.
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