In this work, we report excellent ferroelectric, piezoelectric, and dielectric properties in 0.95(K_0.5−x/2Na_0.5−x/2Li_x)NbO₃-0.04BaZrO₃-0.01BiFeO₃, ((KN)_1−xL_xN-BZ-BF) lead-free piezoelectric ceramics system by constructing a coexistence of orthorhombic-tetragonal phase boundary near the room temperature, and increasing of grain size as well through the conventional sintering process. The addition of Li⁺ ions, in ((KN)_1−xL_xN-BZ-BF) composition, increased the grain size, and shifted the orthorhombic-tetragonal phase transition to near room temperature, and shifted the tetragonal-cubic phase transition toward higher temperatures, since both large electrical properties, and moderate Curie temperature was achieved simultaneously. The sample with x = 0.03 showed large average grain size of (9 µm), and possess coexisting of orthorhombic-tetragonal phases, since the sample showed excellent physical properties, such as d₃₃ = 330 pC/N, k_p = 0.5, P_r = 25 µC/cm², and ε_r = 1740. The origin of these decent combinations of physical properties owes to the coexistence of orthorhombic-tetragonal phase transition to near room temperature, large grain size, and hybridization between Bi 6p, and O 2p as well.

在这项工作中，我们报告了在 0.95(K _0.5−x/2 Na _0.5−x/2 Li _x )NbO ₃ -0.04BaZrO ₃ -0.01BiFeO ₃ , ((KN) _1−x L _x N-BZ-BF)无铅压电陶瓷系统通过在室温附近构建正交-四方相界共存，并通过常规烧结工艺增加晶粒尺寸。添加 Li ⁺离子，在 ((KN) _1−x L _xN-BZ-BF)成分，增加了晶粒尺寸，并将正交-四方相变移至接近室温，并将四方-立方相变移向更高温度，因为实现了大的电性能和适中的居里温度同时。x = 0.03的样品 平均晶粒尺寸较大 (9 µm)，并且具有正交-四方相共存，因为样品具有优异的物理性能，例如d ₃₃ = 330 pC/N, k _p = 0.5, P _r = 25 µC/cm ²和ε _r= 1740. 这些良好的物理性质组合的起源归因于斜方晶系-四方晶系相变到接近室温的共存、大晶粒尺寸以及Bi 6 p和O 2 p之间的杂化。