Ferroelectric Properties of (1-x)Ba(Zr_0.2Ti_0.8)O₃-xKNbO₃ Ceramics

Abstract

The (1-x)Ba(Zr_0.2Ti_0.8)O₃-xKNbO₃ samples were synthesized by solid state reaction method. The samples were investigating on the crystalline structure, dielectric and ferroelectric properties. XRD pattern exhibited the microstructure and tetragonal phase for all samples with sintering temperature at 1150 °C. The results showed that 0.2KNbO₃ coexisted between tetragonal to cubic phases. The dielectric constant obviously was increased from adding 0.3KNbO₃, while the dielectric loss slightly decreases. The P-E loops of sample ceramic showed the ferroelectric behavior, as well as normally ferroelectric and relaxor ferroelectric. In addition, the good ferroelectric properties exhibited E_c = 2.80 kV/cm, P_r = 7.24 µC/cm² for 0.3KNbO₃, which it originated to the contributions of the perovskite structure (tetragonal phase).

Acknowledgments

This work was partly supported by Scanning Electron Microscope (SEM) images from National Metal and Materials Technology Center (MTEC).