Comparison of piezoelectric ceramic crystals and why they have the polarity

1.About the piezoelectric ceramic materials, can their parameters be varying?

As for the piezoelectric ceramic materials, in general, whose parameters are constant rather than changing conditions. However, it should be noted that the thickness and diameter of the piezoelectric ceramic have a certain influence on the dielectric constant and elastic stiffness of the piezoelectric sensor resonance, sometimes, this cannot be taken into consideration.

2.Is the piezoelectric ceramic crystal different from that of a quartz crystal?

The crystal oscillator of the piezoelectric ceramic and the piezoelectric transducer quartz crystal oscillator are compared in terms of the two, and there are certain differences, and the two are mainly on the accuracy and temperature stability. Moreover, relatively speaking, the accuracy of the quartz crystal oscillator can reach six decimal places and its piezoelectric ceramic element is ppm.

3.About piezoelectric ceramics, why is it polar?