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Advanced characterization of the structural and electrical properties of La0.6Ce0.2Ba0.2FeO3 synthesized via the sol-gel method
Authors: Dhahri, H.; Eddine, M.S.; Trifi, C.; Omri, A.; Dhahri, E.; Graca, M.P.F.; Costa, B.F.O.; Younes, R.B.
Ref.: J. Korean Phys. Soc. Early Access (2025)
Abstract: In this work, we investigated the morphological, structural, and electrical characteristics of the sol-gel-synthesized La0.6Ce0.2Ba0.2FeO3 compound. The synthesis of LCBFO, with an orthorhombic structure and space group Pbnm, along with the secondary phases CeO2 and Ce11O20, was verified by X-ray diffraction (XRD) research. SEM micrographs revealed round grains with noticeable porosity. Thermal analysis using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) demonstrated stable thermal behavior, with a significant weight loss occurring around 340 degrees C due to the decomposition of organic residues. M & ouml;ssbauer spectroscopy confirmed the presence of Fe (III) ions in octahedral coordination, with an additional site attributed to Ba substitution. Electrical conductivity measurements analyzed using Jonscher´s universal power law (sigma omega=sigma dc+A omega s\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sigma \left(\omega \right)= {\sigma }_{\text{dc} }+A{\omega }<^>{\text{s}}$$\end{document}) showed a DC conductivity (sigma dc) of 1.25 x 10-4 S/cm at room temperature, with an activation energy (Ea) of 0.265 eV determined from the Arrhenius plot. The dielectric permittivity, modeled using the Maxwell-Wagner interfacial polarization theory, exhibited a relaxation phenomenon with a peak observed at 10 kHz. These results suggest that La0.6Ce0.2Ba0.2FeO3 synthesized via the sol-gel method exhibits promising structural integrity and electrical properties, making it a potential candidate for applications in chemical sensors, fuel cells, and magnetic materials.
