Abstract
La0.7Sr0.3FexMn1-xO3 for (x=0.20 and 0.30) compound was modified by substituting Fe at Mn site in order to study different physical properties for its use as the cathode of SOFCs. The solid-state method was used to synthesize the material. The single crystallized phase was observed by X-ray diffraction and the size of the particle was observed to be in micrometer. Micrographs obtained from scanning electron microscope indicate a decrease in grain size with Fe doping. Density was calculated by Archimedes Principle and calculated values indicate increases in density with Fe substitution. Thermal expansion coefficient (TEC) observed by dilatometer decreased with Fe doping and thermogravimetric analysis showed weight gain by the compound with the rise in temperature. Impedance spectroscope recognized the non-Debye relaxation behavior of the compounds. Fe- substitution enhanced the conductivity and decreased the activation energy. Investigated parameters indicated that the prepared perovskite compounds are suitable for cathode application in SOFC.
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