Sol-gel synthesis and impedance studies of perovskite Pb (1- x) (Na 0.5 Sm 0.5 ) x TiO 3 ceramics

Abstract

Sodium and samarium substituted PbTiO 3 ceramics Pb (1-x) (Na 0.5 Sm 0.5 ) x TiO 3 for x = 0.30 and 0.40 compositions have been synthesized using sol-gel process. The present investigation focus on the temperature-dependent relaxation process and impedance studies of PNST ceramics. Two semicircular arcs were observed in Nyquist plot. Fitting of impedance data using Cole-Cole equation was used to separate the grain and grain boundary contribution to total impedance. The overall conductivity decreases with an increase in substitution. At 410 °C the conductivity varies from 3.7×10 -7 Ω -1 cm -1 to 1.9×10 -7 Ω -1 cm -1 for x = 0.30 to x = 0.40 respectively. © 2019 Author(s).