Study on Polarization Behavior of Multilayer Ceramics Using Various Ferroelectric Materials

We investigated the effect of AC and Uni-Polar polarization on piezoelectric properties of multilayer ceramics using three types of Ferroelectric materials, such as BT, LNKN and PZT based systems. We found LNKN and PZT systems showed both AC and Uni-Poling effect that showed high d31* value comparable to DC polarization. Especially, PZT systems showed AC and Uni-Polling effect in the wide frequency range, even at a high frequency of 20 kHz, which indicates that it can be polarized in an extremely short time of 0.1 ms. The mechanisms of polarization in these materials will be discussed.