An impedance spectroscopy study of sol-gel prepared La_0.9Sr_0.1Fe_0.7Mo_0.3O₃perovskite

In this present work, impedance spectroscopy was applied to investigate the electrical properties of La0.9Sr0.1Fe0.7Mo0.3O3 (LSFMo) perovskite prepared by sol-gel and sintering methods. SEM analysis reveals the non-uniform grain distributed in samples with average grain size 347 nm. The complex impedance has been examined in the frequency range of 100 Hz-1 MHz and temperature range of 75-250 C. The Nyquist plots were identified to form single semicircular arc described as grain behavior working in conduction mechanism. The dielectric and complex conductivity is shown depending on the temperature and frequency. The evolution of ln σDC vs 103/T (K-1) satisfies Arrhenius law and the activation energy is found to be 0.45 eV for this conduction mechanism.