Dielectric anomalies in †111‡ oriented 0.955Pb„Zn1Õ3Nb2Õ3...O3À0.045PbTiO3 single crystals under different electrical and thermal conditions

A detailed investigation has been conducted on the dielectric anomalies induced by different electrical and thermal conditions in @111# oriented 0.955Pb(Zn1/3Nb2/3)O320.045PbTiO3 ~PZN-4.5%PT! single crystals. Application of a dc electrical field to the crystal results in field induced dielectric anomalies to occur at specific temperatures, which can be explained by the structural phase transitions from rhombohedral to orthorhombic, from orthorhombic to tetragonal, and from tetragonal to cubic phase, respectively. All transition temperatures are independent of frequency and have a threshold field that is dependent on the thermal history. The electric field– temperature diagrams based on dielectric anomalies were developed under different schemes of temperature and field variations. © 2004 American Institute of Physics. @DOI: 10.1063/1.1728315#