Dielectric behavior and phase transitions of  oriented (1 − x)Pb(Mg1/3Nb2/3)O3−xPbTiO3 single crystals with x = 29, 31, 32, and 33 % were investigated by impedance measurements and high resolution x-ray diffraction analysis under various electrical and thermal conditions. Application of a bias field along  can shift down the Rhombohedral-Tetragonal structural phase transition, so that the morphotropic phase boundary is shifted by the bias field. We have quantified this shift under 1 kV dc bias along . A transition between the normal ferroelectric and relaxor states was indicated by the appearance of a frequency dispersion shoulder slightly below TC and an abrupt disappearance of the frequency dispersion at a lower temperature. This relaxor-ferroelectric transition was found to be thermally driven in the compositions with PbTiO3 (PT) contents from 31 to 33 %. While for the composition with 29% PT content, a bias field can help to produce this transition.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 1 2003|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics