Abstract
The microdomain–macrodomain transformations and phase transitions in0.69Pb(Mg1/3Nb2/3)O3–0.31PbTiO3 single crystals were investigated by measuring the temperature dependenceof relative permittivity as a function of crystal orientation and applied dcbias. A rhombohedral–tetragonal phase transition in the original crystal hasbeen confirmed by powder x-ray diffraction at temperatures from 25 to180 °C.The results show that microdomain relaxor ferroelectric states in the original crystals couldbe transformed to macrodomain ferroelectric states by applying a dc bias along any of the, and directions. It is also proposed that an electric field applied along the or direction could induce an orthorhombic or a monoclinic ferroelectric phase, respectively,between the rhombohedral and tetragonal ferroelectric phases in an intermediatetemperature range.
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