Influences of oxide chemical modified on microstructure and electrical properties of PbTiO3-Bi(Ni1/2Ti1/2)O3

The piezoelectric ceramics 0.45PbTiO3-0.55Bi(Ni1/2Ti1/2)O3 doped with PbO, Bi2O3, NiO and TiO2 were synthesized by conventional solid state reaction method. Thereafter, the structural, ferroelectric and piezoelectric properties of modified ceramics were investigated systematically. By adding Bi2O3, NiO and TiO2, the leakage current of ceramics was found to diminish pronouncedly. Moreover, the coercive field was observed to decrease by modification with TiO2 in these ceramics. It was also proven that NiO can only be added in the B-site in PT-55BNT from the results of X-ray photoelectron spectroscopy analysis. Therefore, the modification with oxides can inhibit the volatilization of Pb during the sintering process that eventually improves the performance of materials.