The morphotropic phase boundary and dielectric properties of the xPb(Zr1/2Ti1/2)O-3-(1-x)Pb(Ni1/3Nb2/3)O-3 perovskite solid solution

摘要

The solid solution between the normal ferroelectric Pb(Zr1/2Ti1/2)O-3 (PZT) and relaxor ferroelectric Pb(Ni1/3Nb2/3)O-3 (PNN) was synthesized by the columbite method. The phase structure and dielectric properties of xPZT-(1-x)PNN where x=0.4-0.9 and the Zr/Ti composition was fixed close to the morphotropic phase boundary (MPB) were investigated. With these data, the ferroelectric phase diagram between PZT and PNN has been established. The relaxor ferroelectric nature of PNN gradually transformed towards a normal ferroelectric state towards the composition 0.7PZT-0.3PNN, in which the permittivity was characterized by a sharp peak and the disappearance of dispersive behavior. X-ray diffraction analysis demonstrated the coexistence of both the rhombohedral and tetragonal phases at the composition 0.8PZT-0.2PNN, a new morphotropic phase boundary within this system. Examination of the dielectric spectra indicates that PZT-PNN exhibits an extremely high relative permittivity near the MPB composition. The permittivity shows a shoulder at the rhombohedral to tetragonal phase transition temperature T-RT=195 degreesC, and then a maximum permittivity (36 000 at 10 kHz) at the transition temperature T-max=277 degreesC at the MPB composition. The maximum transition temperature of this system was 326 degreesC at the composition x=0.9 with the relative permittivity of 32 000 at 10 kHz. (C) 2004 American Institute of Physics.