Abstract
Fine crystalline LaFeO 3 and antimony-substituted compounds have been prepared by co-precipitation method. The as synthesized materials have been sintered at 1000 °C for single-phase compound formation and evaluated for their electrical and structural properties. TG/DTA studies ascribed that the precursor powders have undergone rapid changes during the transformation of LaFeO 3 and substituted compounds. XRD data reveal the presence of well-defined sharp peaks, indicating the single-phase perovskite structure of LaFeO 3 and polycrystalline structure of LaFeO 3 and Sb 2O 3 compounds. The FT–IR spectra exhibit an absorption band corresponding to Fe–O stretching vibration, which is shifted on the substitution of Sb 3+ ions. The temperature dependent d.c. conductivity shows the semiconducting behavior of the synthesized materials. The band gap values are found to increase upto x = 0.4 and decrease on further increase in concentrations of the Sb 3+ ions. The decrease in dielectric constant with increasing frequency explained the Maxwell–Wagner Interfacial polarization model.
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