The formation of a morphotropic phase boundary (MPB) in piezoelectric ceramics is one of the most important techniques to enhance their dielectric and piezoelectric properties. In this work, a rhombohedral (R) and tetragonal (T) phase boundary has been designed and clarified using the lead‒free 0.92(Na_0.5K_0.5)NbO₃–(0.08–x)(Bi_0.5Li_0.5)TiO₃–xBaZrO₃ ternary system. The R-T phase coexistence region is identified in the ceramics with 0.06 ≤ x ≤ 0.07. We successfully demonstrated that the crystal’s relatively enhanced d₃₃ and its excellent temperature stability are originated from phase transition behaviors that were confirmed by the temperature‒dependent dielectric properties and X−ray diffraction (XRD) patterns.

压电陶瓷中形变相界（MPB）的形成是提高其介电和压电性能的最重要技术之一。在这项工作中，使用无铅0.92（Na _0.5 K _0.5）NbO ₃ –（0.08– x）（Bi _0.5 Li _0.5）TiO ₃ – x BaZrO ₃三元系。所述RT相共存区域在陶瓷识别与0.06≤  X  ≤0.07。我们成功地证明了晶体的相对增强d ₃₃ 其出色的温度稳定性源于相变行为，该相变行为由与温度相关的介电特性和X射线衍射（XRD）图案证实。