Piezoelectric properties of lead zirconate titanate ceramics at low and high temperatures

The material properties and damage characteristics of lead zirconate titanate(PZT) ceramics were investigated at various temperatures. A positive voltage was obtained when the sample was cooled from 20 degrees C to -190 degrees C, while a negative voltage was obtained when the sample was heated from -190 degrees C to 180 degrees C. The difference between the positive and negative values depended on the thermal stress. Compressive stress generated a more positive voltage in the cooling process, while tensile stress led to a more negative voltage in the heating process. The voltage values also depended on the cooling (or heating) rate of the sample, e.g. the greater the cooling (or heating) rate, the greater the voltage. When cyclic loading was conducted mechanically at -190 degrees C, the voltage reduced, but it was recovered after heating to 20 degrees C. Damage of the PZT ceramic (90 degrees domain switching) was detected when the sample was cooled to -190 degrees C due to the high thermal stress.