Ferroelectric Properties of PZT Heterolayered Thick Films

PFerroelectric PZT heterolayered thick films were fabricated by the alkoxide-based sol-gel method. PZT(40/60) and PZT(60/40) paste were made and alternately screen-printed on the $Al_2O_3$ substrates. We have introduced a press-treatment to obtain a good densification of screen printed films. The porosity of the thick films were decreased with increasing the applied pressure and the thick films pressed at 0.6 ton/$cm^2$ showed the dense microstructure and thickness of about 76${\mu}m$. The remanent polarization and coercive field increased with increasing applied pressure and the values for the PZT thick films pressed at 0.6 ton/$cm^2$ were 17.04${\mu}Ccm^2$, 78.09 kV/cm, respectively.