Microstructure, dielectric, piezoelectric, and ferroelectric properties of fine-grained 0.94Na(0.5)Bi(0.5)TiO(3)-0.06BaTiO(3) ceramics

摘要

For preparing fine-grained 0.94Na(0.5)Bi(0.5)TiO(3)-0.06BaTiO(3) lead-free ferroelectric ceramics, the precursor powders were synthesized via sol-gel method and calcined at various temperatures. The precursor powders calcined at 520 degrees C, 550 degrees C, and 600 degrees C exhibit mean grain sizes of 30 +/- 4 nm, 54 +/- 3 nm, and 78 +/- 5 nm, respectively. By optimizing the synthesis parameters, the fine-grained ceramics with high relative densities ( 97%) and mean grain size around 100 nm were prepared. The ferroelectric, dielectric, and piezoelectric behavior were investigated. The ceramics prepared using the different precursor powders show different piezoelectric, ferroelectric, and dielectric behavior. The ceramic calcined at 550 degrees C and sintered at 900 degrees C exhibits the breakdown strength higher than 85 kV/cm, which exhibits the maximum polarization of 38.4 +/- 0.3 mu C/cm(2), remanent polarization of 20.6 +/- 0.4 mu C/cm(2).