Dielectric properties and phase transitions of <001>-oriented Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-PbTiO/sub 3/ single crystals

Abstract

The temperature dependence of dielectric properties and phase transitions of <001> oriented (1-x)Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/-xPbTiO/sub 3/ (PZN-PT) single crystals for x = 4.5% and x = 8% have been investigated as a function of DC bias field. These crystals exhibit frequency dispersion and increasing the PT content in die crystals suppresses the degree of relaxor behavior. As the bias field increases over a critical value, the temperature of the tetragonal-cubic phase transition increases but the temperature of the rhombohedral-tetragonal phase transition decreases with bias field. A bias field can stabilize the tetragonal phase in <001> oriented PZN-PT crystals resulting in a long-range ordered state and induced normal ferroelectric behavior.