The application of piezoelectric ceramics at high temperature is limited because they can't have both high piezoelectric coefficient and high Curie temperature. While, BiScO₃–PbTiO₃-based piezoelectric ceramics possessing high Curie temperature and piezoelectric properties simultaneously have drawn increasing attention due to their potential applications at high temperature. Here, we reported a novel compositional design of (1-x)[0.36BiScO₃-0.64PbTiO₃]-xBi(Sn_1/3Nb_2/3)O₃ (abbreviated as BS-PT-xBSN). BS-PT-xBSN ceramic samples were synthesized by conventional solid state reaction method. According to the ternary phase diagram of BS-PT-xBSN ceramics brought up in this work, the morphotropic phase boundaries (MPB) were confirmed, which is located in the vicinity of x = 0.02. It canbe identified that the x = 0.02 sample near MPB has the optimal electric performance which are giant piezoelectric coefficient (d₃₃ ∼ 450 pC/N, higher 18 % than undoped samples) and high Curie temperature (T_c ∼ 368 °C) as well as large remant polarization (P_r ∼ 46.6 μC/cm²). In addition, the variation of P_r is 3 % in the temperature range of 30–180 °C and the depolarization temperature of x = 0.02 ceramics is about 280 °C. Structural analysis such as in-situ PFM and TEM confirms that giant piezoelectricity and depolarization temperature are attributed to the appearance of nano-domain and complexity of domains as well as the stable domain configuration. This work not only reveal the high potential of BS-PT-xBSN for high-temperature piezoelectric applications but also open up a feasible approach to design new high-temperature piezoelectric ceramics.

压电陶瓷不能同时具有高压电系数和高居里温度，因此在高温下的应用受到限制。而同时具有高居里温度和压电性能的BiScO ₃ -PbTiO ₃基压电陶瓷因其在高温下的潜在应用而受到越来越多的关注。在这里，我们报道了一种新颖的(1-x)[0.36BiScO ₃ -0.64PbTiO ₃ ]-xBi(Sn _1/3 Nb _2/3 )O _{3的组成设计。}（简称BS-PT-xBSN）。BS-PT-xBSN陶瓷样品采用常规固相反应法合成。根据本工作提出的BS-PT-xBSN陶瓷的三元相图，确认了变质相界（MPB），其位于x = 0.02附近。可以确定，在 MPB 附近的 x = 0.02 样品具有最佳的电性能，即巨压电系数（d ₃₃ ∼ 450 pC/N，比未掺杂样品高 18 %）和高居里温度（T _c  ∼ 368 °C）为以及大的剩余极化（P _r  ~ 46.6 μC/cm ²）。此外，P _r的变化在 30–180 °C 的温度范围内为 3%，x = 0.02 陶瓷的去极化温度约为 280 °C。原位PFM 和 TEM等结构分析证实，巨大的压电性和去极化温度归因于纳米域的出现和域的复杂性以及稳定的域配置。这项工作不仅揭示了 BS-PT-xBSN 在高温压电应用中的巨大潜力，而且为设计新型高温压电陶瓷开辟了一条可行的途径。