Effect of antimony substitution on structural and electrical properties of LaFeO3

✍ Scribed by L. John Berchmans; R. Sindhu; S. Angappan; C.O. Augustin

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 848 KB
• Volume: 207
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2008.06.054

✦ Synopsis

Fine crystalline LaFeO 3 and antimony-substituted compounds have been prepared by coprecipitation 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 2 O 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.