Dielectric and ferroelectric properties of lead zirconate titanate-lead nickel niobate ceramics under compressive stress

摘要

Dielectric and ferroelectric properties of complex perovskite lead zirconate titanate-lead nickel niobate ceramic system were investigated under the influence of the compressive stress. The results showed that the dielectric properties, i.e., dielectric constant (ε_r) and dielectric loss (tan δ), and the ferroelectric characteristics, i.e., the area of the ferroelectric hysteresis (P-E) loops, the maximum polarization (P_(max)), and the remanent polarization (P_r) changed significantly with increasing compressive stress. These changes depended greatly on the ceramic compositions. The experimental results on the dielectric properties could be explained by the deaging phenomenon. The stress-induced domain wall motion suppression and non-180° ferroelectric domain switching processes were responsible for the changes observed for the ferroelectric parameters. In addition, a significant decrease in those parameters after a cycle of stress was observed and attributed to the stress-induced decrease in switchable part of spontaneous polarization. This study clearly showed that the applied stress has significant influence on the electrical properties of complex perovskite ceramics.