Impedance and AC conductivity studies of Sm3+ substituted 0.8Ba0.2(Bi0.5K0.5)TiO3 lead free ceramics

Samarium substituted 0.8Ba0.2(Bi_0.5K_0.5)TiO₃ (here after abbreviated as BTBKT-20) lead free ceramics with composition 0.8Ba0.2(Bi_0.5(1-x)Sm_0.5xK_0.5)TiO₃ (where x=0.01,0.03,0.05) lead free ceramics have been prepared by solid state reaction and followed by high energy ball milling process. The present paper focuses the impedance and ac conductivity studies of Sm substituted BTBKT-20 lead free ceramics. Impedance spectroscopic studies revealthat temperature dependent relaxation process. Single depressed semi circle was observed in Cole-Cole plots, indicates non-Debye kind of relaxation process. Maximum grain resistance was observed for x=0.03 Sm substituted BTBKT-20 sample. Frequency and temperature dependent AC conductivity was calculated and it found to obey the universal Jonscher's power law and the values of activation energies suggest that conduction is ionic in nature.