烧结升温速率对(Na0.5Bi0.5)0.94Ba0.06TiO3无铅陶瓷的结构和电学性能的影响

(Na0.5Bi0.5)0.94Ba0.06TiO3 lead-free ceramics were prepared via a conventional solid state reaction method. During sintering process, various heating rates (0.5, 1, 3, 5 C/min) were used. Effect of heating rates on phase structure, microstructure, piezoelectric, dielectric and ferroelectric properties were studied in detail. All ceramics demonstrate typical diffraction peaks of ABO3 perovskite structure. The mean grain size, Curie temperature and maximum dielectric constant decrease with the increase in the heating rate. All samples show a diffuse character of the phase transition. The increase in the heating rates results in an increase in the maximum polarization, remanent polarization and piezoelectric constant d33, while a decrease in coercive field.