Effects of sintering temperature and KBT content on microstructure and electrical properties of (Bi.5Na.5)TiO3-BaTiO3-(Bi.5K.5)TiO3 Pb-free ceramics
Effects of sintering temperature and KBT content on microstructure and electrical properties of (Bi.5Na.5)TiO3-BaTiO3-(Bi.5K.5)TiO3 Pb-free ceramics
复制标题
烧结温度和KBT含量对(Bi.5Na.5)TiO3-BaTiO3-(Bi.5K.5)TiO3无铅陶瓷显微结构和电性能的影响
DOI：
10.1016/j.ceramint.2018.02.142
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Yan Yan
中科院分区：
文献类型：
--
作者：
Liu Gang;Jiang Wentao;Zhang Leiyang;Cai Jing;Wang Ziyang;Liu Kaihua;Liu Xiaokui;Chen Yi;Liu Hongbo;Yan Yan
根据相图设计了一条探索（Bi.5Na.5）TiO 3-BaTiO 3-（Bi.5K.5）TiO 3三元系准同型相界（MPB）区的路线。采用X射线衍射（XRD）分析了样品的物相组成。研究了[（1-x）0.9363（Bi.5Na.5）TiO 3 -0.0637BaTiO3]-x（Bi.5K.5）TiO 3（BNKBT 100 x）三元无铅压电陶瓷的介电、铁电和压电性能随x和烧结温度的变化。当x在0 ~ 0.11范围内变化时，BNKBT 100 x陶瓷在1130-1210 °C烧结时呈单一钙钛矿结构。这些陶瓷表现出大的介电常数，小的介电损耗，和扩散相变行为。该材料具有明显的铁电极化-电场（P-E）滞回线和较大的压电系数和机电系数。随着x的增大，电性能先增大后减小。当改变烧结温度时，发现相同的规律。最终得到了最佳的成分和烧结温度。
A route exploring the morphotropic phase boundaries (MPB) region in (Bi.5Na.5)TiO3-BaTiO3-(Bi.5K.5)TiO3ternary system has been designed based on the phase diagram. X-ray diffraction (XRD) has been performed to determine the phases of the prepared samples. The dielectric, ferroelectric, and piezoelectric properties of [(1-x) 0.9363(Bi.5Na.5)TiO3–0.0637BaTiO3]-x(Bi.5K.5)TiO3(BNKBT100x) ternary lead-free piezoelectric ceramics are investigated as the functions ofxand sintering temperature. Whenxwas varied from 0 to 0.11, the BNKBT100xceramics show single perovskite structure sintered at 1130–1210 °C. These ceramics show large dielectric permittivity, small dielectric loss, and diffused phase transition behavior. Well-defined ferroelectric polarization-electric field (P-E) hysteresis loop and relative large piezoelectric and electromechanical coefficients are also found in these ceramics. When increasingx, the electrical performances first increase, then decrease. The same rule is found when varying the sintering temperature. The optimized composition and sintering temperature are finally obtained.