Abstract
The paper deals with the non-linear properties of the piezoelectric ceramics Pb(Zr x Ti 1 − x )O 3 (PZT) at room temperature. The influence of DC electric field on the material parameters, such as piezoelectric coefficients d 31 and d 33 of PZT ceramics, was studied using the resonance method. The dependence of the resonance and antiresonance frequencies of PZT resonators on DC electric field was measured. Hydrostatic piezoelectric coefficients d h , calculated from d 33 and d 31 piezoelectric coefficients, were compared with d h coefficients, that were measured directly by dynamic hydrostatic method. Electric field limits for application on PZT ceramics were determined. A remarkable influence of the DC electric field on d 31 and d 33 piezoelectric coefficients values was exhibited for soft PZT ceramics (APC 850 and APC 856).
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