High piezoelectricity in PFN-PNN-PZT quaternary ceramics achieved via composition optimization near morphotropic phase boundary

To analyze the effect of PFN content on the microstructure and electrical properties of xPb(Fe0.5Nb0.5) O-3-(0.57-x)Pb(Ni1/3Nb2/3)O3-0.43Pb(Zr0.3Ti0.7)O-3, the doping of xPFN-PNN-PZT) were systematically studied with 0.015 & LE; x >= 0.075. XRD patterns and Raman spectra analysis reveal that PFN diffuses into PNN-PZT perovskite lattice and forms new quaternary solid solution. With the increase of PFN content x, the proportion of rhombohedral (R) phase decreases gradually, whereas the proportion of tetragonal (T) phase displays a contrary trend. In particular, R-T coexistence near MPB was observed at x = 0.045. Meanwhile, optimized electrical properties of d33 = 961 pC/N, kp = 0.716, epsilon r = 6298, and tan & = 3.1% are achieved for the 0.045PFN-PNN-PZT ceramics. Moreover, the ceramics at MPB showed larger remnant polarization Pr = 24.55 mu C/cm(2), smaller co-ercive field Ec = 0.36 kV/mm, and lower dielectric relaxor degree gamma = 1.813. All these results reveal that the enhanced electrical properties could be attributed to synergistic phase boundary motion, dielectric relaxor behavior and ferroelectric hysteresis effect.

Automated summary

This study systematically investigated the effect of PFN content on the microstructure and electrical properties of xPb(Fe0.5Nb0.5)O-3-(0.57-x)Pb(Ni1/3Nb2/3)O3-0.43Pb(Zr0.3Ti0.7)O-3. The results revealed that PFN diffuses into the perovskite lattice and forms a new quaternary solid solution. The proportion of the rhombohedral phase decreases gradually with the increase of PFN content, while the proportion of the tetragonal phase exhibits an opposite trend.