Dielectric and piezoelectric enhancement due to 90° domain rotation in the tetragonal phase of Pb(Mg1/3Nb2/3)O3-PbTiO3

The anomalous enhancement in dielectric (epsilon>6000) and piezoelectric constant (d(33)>600 pC/N) in the tetragonal side (x=35%) of morphotropic phase boundary (MPB) has been observed in polycrystalline (1-x)Pg(Mg1/3Nb2/3)O-3-xPbTiO(3) (PMN-PT). On the other hand, x-ray peak position shifts under electric field (E) demonstrate that the intrinsic piezoelectric response becomes maximum at MPB (x=33%-34%), which may be associated with the recently discovered monoclinic phase. Intensity change of Bragg peaks under E indicates that 90degrees domain rotation is the main contribution to additional strain in the tetragonal side of MPB, which dominates the intrinsic contribution of monoclinic phase in polycrystalline PMN-PT. (C) 2002 American Institute of Physics.