A comparative study of temperature dependent impedance analysis for AFe_0.97Zr_0.03O₃ (A = La, Bi) compounds

Abstract

The interest of LaFeO3 among perovskite inorganic materials increased tremendously due to their applicability ranging from chemical sensors, electrode material, etc. In previous studies, Bi-doped in La site improved the electrochemical performance and reduced the interfacial polarization resistance. Zr doped in the Fe site also improves electrical properties. In this study, LaFe0.97Zr0.03O3 and BiFe0.97Zr0.03O3 material have been successfully synthesized using the sol-gel method to observe the morphology and electrical properties in several temperatures. Characterization of the material was carried out by Scanning Electron Microscope (SEM), Energy Dispersive X-ray spectra (EDX), and Impedance Spectroscopy (IS). SEM results represent the non-uniform grain distribution morphology with estimated size to be 147 nm and 204 nm for LaFe0.97Zr0.03O3 and BiFe0.97Zr0.03O3, respectively. EDX characterization shows that the material is only composed of its constituent elements. The Impedance spectroscopy data show that BiFe0.97Zr0.03O3 better than LaFe0.97Zr0.03O3 in electrical properties because Bismuth ferrite (BiFe0.97ZrxO3) has multiferroics properties.