NBT-KBT-xLN系陶瓷的介电与铁电性能研究

Investigation on Dielectric and Ferroelectric Properties of NBT-KBT-xLN Ceramics

采用传统电子陶瓷工艺制备了(1-x)(0.88Na0.5Bi0.5TiO3-0.12K0.5Bi0.5TiO3)-xLiNbO3(简写为NBT-KBT-xLN)无铅压电陶瓷体系,研究了该陶瓷体系的相结构、显微结构、铁电及介电性能。结果表明:在材料组成范围内(0.02≤x≤0.08),系列试样均形成了稳定的三方相钙钛矿结构;随着LiNbO3含量的增加,系列试样的矫顽场从4.41kV/mm显著下降至1.51kV/mm;LiNbO3的引入对材料的介电性能作用明显,随着LiNbO3含量的增加,系列试样的铁电-反铁电相变峰明显向低温方向移动,而反铁电-顺电相变峰则表现为明显的压峰效应。

（1-x）（0.88Na0.5Bi0.5TiO3-0.12K0.5Bi0.5TiO3）-xLiNbO3 lead-free piezoelectric ceramics were prepared by the traditional electronic ceramic process.The phase structure,microstructure,ferroelectric and dielectric properties were investigated.X-ray diffraction patterns indicate that all ceramics samples （0.02≤x≤0.08） form stable rhombohedral perovskite structure.With the increasing of LiNbO3 amount,the coercive field declines obviously from 4.41 kV/mm to 1.51 kV/mm.At the same time,the ferroelectric-antiferroelectric transition temperature moves significantly form high temperature to low temperature and antiferroelectric-paraelectric transition peak is repressed obviously.