Abstract:
Using conventional solid state reaction method，the Pb0.925Ba0.075Nb2O6-0.5wt.%TiO2 (PBN-T) piezoelectric ceramics were fabricated.The effects of annealing on structure, dielectric and piezoelectric properties of the PBN-T ceramics were investigated. The annealing temperatures and annealing time were chosen as 500 ~ 800 ℃ and 12~168 h, respectively.The annealing atmospheres were selected as air without excess Pb2+ source, air with excess Pb2+ source and nitrogen atmosphere with excess Pb2+ source. The results show that the electrical properties of the ceramics are tightly related to the annealing parameters. The ceramic annealed in nitrogen atmosphere with excess Pb2+ source at 600 ℃ for 73 h shows the better property, where the Curie temperature is 523 ℃, the piezoelectric constant is 85 pC/N at room temperature, and 82 pC/N after thermal treating at 500 ℃.
