Sodium and samarium substituted PbTiO3 ceramics Pb(1-x)(Na0.5Sm0.5)xTiO3 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-1cm-1 to 1.9×10-7 Ω-1cm-1 for x = 0.30 to x = 0.40 respectively.

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