Comparative investigation of structure and dielectric properties of Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (65/35) and 10% PbZrO_3-doped Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO3 (65/35) ceramics prepared by a modified precursor method

摘要

Relaxor ferroelectric Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (65/35) and 10% PbZrO_3-doped Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (65/35) ceramics were both prepared by a modified precursor method, which was based on the high-temperature synthesis of an oxide precursor that contained all the B-site cations for the consideration of B-site homogeneity. The dielectric properties of Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (65/35) ceramic was more of normal ferroelectric behavior, but the high dielectric constant (ε_m = 34,200 at 1 kHz) and piezoelectric constant (d_(33) = 709 pC/N) were observed for this composition close to the morphotropic phase boundary. Comparatively, introduction of 10% PbZrO_3 into Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (65/35) ceramics enhanced the diffuse phase transition as well as the rhombohedral to tetragonal phase transition temperature, while it also kept the high dielectric constant (ε_m = 29,600 at 1 kHz) and piezoelectric constant (d_(33) = 511 pC/N).