No lineal response in thin samples of PZT ceramics.

The development of piezoelectric sensors for high frequency requires to wor k with very thin samples of material. At this thick nesses, the stress conc entration produces strong perturbations in the materials, and the origin of a non linear response, which depends field on working conditions. With the goal to advance in the knowledgement of this phenomenon, and by using Comp lex Impedance Spectroscopy, we have analysed the response of PZT ceramics w ith thickness of microns as a function of the applied and the amplitude of the analysis signal. These results allow to establish the base to the devel opment of ultrasonic tunable sensors for high frequency.