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

Abstract

The anomalous enhancement in dielectric (ε>6000) and piezoelectric constant (d33>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)O3-xPbTiO3 (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 90° 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.