Temperature-And dc bias field-Dependent piezoelectric effect of soft and hard lead zirconate titanate ceramics

The dc bias field-dependent piezoelectric coefficient d₃₃ of lead zirconate titanate ceramics (PZT5, PZT8 and P5H) were determined by a quasi-static method. It was found that piezoelectric coefficient d33 was almost independent of positive dc bias field for PZT8 and PZT5 ceramics, while for P5H ceramic an obvious decrease of coefficient d₃₃ was observed under positive dc bias field. On the other hand, the temperature-dependent piezoelectric response for PZT ceramics were investigated by both quasistatic and resonance methods. The piezoelectric coefficient d₃₃ was found to increase with increasing temperature for both PZT5 and PZT8 ceramics. For P5H ceramics, coefficient d₃₃ showed a first decreasing and then increasing tendency with respect to temperature. These results were discussed in terms of intrinsic and extrinsic contributions to piezoelectric response.