Abstract
Nanocrystalline layered perovskite Sr0.5A0.5Bi2Nb2O9 (A = Co2+, Ni2+, Cu2+) ferroelectric ceramics were synthesized through chemical process. The synthesized compounds were found to have tolerance values 0.90, 0.865 and 0.872 which are well within its limit. The electrical behaviour was thoroughly studied through impedance analysis within the temperature range between 400 °C and 500 °C after sintering the pressed pellet at 750 °C for 4h. Strong relaxation behaviour was found for Sr0.5Co0.5Bi2Nb2O9 and Sr0.5Cu0.5Bi2Nb2O9. The ac activation energy was calculated from the relaxation behaviour. All the studied samples showed grain conductivity behaviour only. The binding energy and density of states were studied with respect to temperature and frequency. The hopping behaviour was also studied and established a correlated barrier hopping model.
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