Dielectric Behavior of 95.5% Pb(Zn1/3Nb2/3)O3–4.5% PbTiO3 Single Crystals under DC Bias from 12–550 K

Abstract

This work reports a detailed study of the dielectric behavior of 95.5% Pb(Zn1/3Nb2/3)O3 − 4.5% PbTiO3 (PZN-4.5PT) single crystals with and without dc bias. It is found that there are at least five sets of dielectric anomalies for PZN-4.5PT from 12 K to 550 K. There are two dielectric peaks, around 430 K and 395 K, which are referred to as cubic-tetragonal and tetragonal- rhombohedral phase transitions, respectively, above room temperature. Furthermore, a set of broad peaks around 350 K (at 10 kHz) that showed up under electric field of 10 kV/cm might indicate the existence of a monoclinic distortion MA phase.