Behaviour of Pb (Ni_(1/3)Sb_(2/3))O_3-PbZrTiO_3 ferroelectric ceramics under cyclic electric loading

摘要

This study investigates the behavior of Pb_(1-z)La_z (NiSb)_(0.05)[(Zr_(0.520 Ti_(0.48))_(1-z/4)]_(0.95)O_3 (La-PNS-PZT) ceramics where z = 0.01-0.05 in response to cyclic electrical loading. Samples were fabricated by mixed oxide route and subjected to electrical stress by applying the electric load of 1,500 V, along the polar axis, with fatigue amplitudes of 20 V. Impedance and resonance frequency response was studied after every 106 cycles. Degradation in electromechanical coupling factor (k_p), piezoelectric strain constant (d_(33)) and dielectric constant (K_3~T) were also studied and correlated with structural properties. Results revealed that the La-PNS-PZT composition containing 3 mol% of lanthanum could be more suitable for actuator applications since it shows minimum degradation in properties after 10~(12) cycles of electric load.