Structural and Electrical Properties of 0.69Pb(Mg1/3Nb2/3)O3-0.31PbTiO3 Ceramics Prepared by Partial Oxalate Route Via Different Processings

Abstract

The 0.69Pb(Mg1/3Nb2/3)O3-0.31PbTiO3 (0.69PMN-0.31PT) ceramics were prepared by a partial oxalate route via the columbite precursor method, a modified columbite precursor method and the B-site oxide mixing route. X-ray diffraction (XRD) measurement confirmed that pure-phase perovskite 0.69PMN-0.31PT ceramics were prepared by the modified columbite precursor method. All the sintered 0.69PMN-0.31PT ceramics exhibit large relative density, and rather homogenous and densified microstructure morphology, in which the 0.69PMN-0.31PT ceramics prepared by the modified columbite precursor method exhibit large bulk density, being 7.9015 g/cm3, which reaches 96.74% of the theoretical density. The largest value of dielectric constant maximum (ϵm) appears in the 0.69PMN-0.31PT ceramics prepared by the B-site oxide mixing route, being 32232 at 1 kHz. All the synthesized 0.69PMN-0.31PT ceramics exhibit typical ferroelectric phase transition with slightly diffused character, fully developed, saturated and symmetric P-E hysteresis loops, and excellent piezoelectric property. Ceramic processings exert great effects on electrical properties of the synthesized ceramics. Comparatively, the 0.69PMN-0.31PT ceramics prepared by the B-site oxide mixing route exhibit excellent electrical properties.