Abstract A route exploring the morphotropic phase boundaries (MPB) region in (Bi.5Na.5)TiO3-BaTiO3-(Bi.5K.5)TiO3 ternary 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 of x and sintering temperature. When x was varied from 0 to 0.11, the BNKBT100x ceramics 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 increasing x, 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.

中文翻译：

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烧结温度和KBT含量对(Bi 0.5 Na 0.5 )TiO 3 -BaTiO 3 -(Bi 0.5 K 0.5 )TiO 3 无铅陶瓷微观结构和电学性能的影响

摘要 基于相图设计了一条探索(Bi.5Na.5)TiO3-BaTiO3-(Bi.5K.5)TiO3三元体系同向相界(MPB)区域的路线。已进行 X 射线衍射 (XRD) 以确定制备的样品的相。[(1-x) 0.9363(Bi.5Na.5)TiO3–0.0637BaTiO3]-x(Bi.5K.5)TiO3 (BNKBT100x)三元无铅压电陶瓷的介电、铁电和压电性能研究如下x 和烧结温度的函数。当 x 从 0 变化到 0.11 时，BNKBT100x 陶瓷显示出在 1130-1210 °C 下烧结的单一钙钛矿结构。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。在这些陶瓷中还发现了明确的铁电极极化电场 (PE) 磁滞回线和相对较大的压电和机电系数。当 x 增加时，电气性能先增加，然后下降。当改变烧结温度时发现相同的规则。最终得到优化的成分和烧结温度。