Abstract
Piezoelectric aging behavior of 0.2(PbMg1/3 Nb2/3 O3)−0.8(PbZr0.475 Ti0.525 O3) multilayer ceramic actuators have been investigated by applying unipolar wave function at the room temperature. 5×5×5 mm3 size multilayer ceramic actuators were fabricated by tape casting methods. Effective electromechanical coupling coefficient keff and pseudo-peizoelectric constant d33 were calculated and discussed. Different unipolar electric fields were applied to the actuators to investigate aging behavior in the multilayer ceramic actuators. The aging dependencies of cycle and electric field were simulated and fitted to the linear logarithmic stretched exponential law. Finally true-psuedo-piezoelectric constant was extracted and modeled from the linear logarithmic stretched exponential law.
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