(1-x)BiScO₃-xPbTiO₃陶瓷(简记BS-PT)在x=64.0%附近存在一个从菱方晶系过渡到四方晶系的准同型相界, 在此相界附近材料能获得优良的介电和压电性能. 本文选取PbTiO₃含量在64.0%~65.5%的准同型相界附近的材料组分, 利用传统的固相烧结反应法合成了纯钙钛矿相结构的BS-PT陶瓷, 通过对材料的相结构形成过程和内部形貌分析以及对介电、压电性能的研究, 发现在x=64.%的组分条件下, BS-PT陶瓷材料获得了准同型相界范围内的最优的压电性能, 其室温压电常数d₃₃可达500pC/N, 且居里温度(T_c)达到了438℃, 剩余极化强度和电致应变分别为44uC/cm²和3.5‰. 研究表明, 准同型相界附近的BS-PT陶瓷是一种优良的压电换能器和传感器材料.

(1-x)BiScO₃-xPbTiO₃ (BS-PT) ceramics exhibits excellent dielectric and piezoelectric properties in the vicinity of the morphotropic phase boundary (x=64.0% mol fraction PbTiO₃), which separates the rhombohedral phase from tetragonal phase. In our study, the pure perovskite BS-PT ceramics was obtained with compositions near the MPB for x varying from 64.0% to 65.5% using traditional solid state reaction. The perovskite phase formation process and microstructure were investigated and also the dielectric and piezoelectric properties were studied. The results show that BS-PT ceramics with x=64.5% has an optimized piezoelectric characterization, its piezoelectric coefficient d₃₃ can reach to as high as 500 pC/N at room temperature, the Curie temperature (Tc) can reach to 438℃, with the remnant polarization Pr=44μC/cm2, electrical field reduced strain 3.5‰. Our research results show that the BS-PT ceramics with the compositions near the morphotropic phase boundary is a good candidate material for the piezoelectric actuator and transducers.