中文摘要：

把BiGaO3作为第三组元引入BiScO3-PbTiO3（BS—PT）体系，用氧化物合成法制备、了0．155BiGaO3－（0．845-x）BiScO3-xPbTiO3（BGSPTx，x为0．54-0．58）压电陶瓷。XRD分析表明，BGSPL具有钙钛矿结构，但同时存在微量的富铋相。三方-四方准同型相界（MPB）位于x为0．56附近。在MPB附近，BGSPTx陶瓷的d33，kp和Pr都达到最大值，分别为180pC／N，30％和18．5×10^-6C／cm^2。εr-t特性曲线测试表明，陶瓷在MPB附近居里温度抽高达494℃。

英文摘要：

BiGaO3 was introduced into the BiScO3-PbTiO3 （BS-PT） system and formed a new type of ceramics 0.155BiGaO3-（0.845-x）BiScO3-xPbTiO3 （BGSPTx, x = 0.54-0.58）. BGSPTx ceramics were fabricated by using conventional mixed metal oxide processing. X-ray diffraction shows that the BGSPTx ceramics have perovskite structure, however, a small amount of the plenty Bi phase is detected. A rhombohedral to tetragonal phase transition （MPB） is determined in the vicinity of x = 0.56. For composition near MPB, BGSPTx ceramics show enhanced piezoelectric coefficient d33, planar coupling coefficient kp and remnant polarization Pr of 180 pC/N, 30%, and 18.5×10^-6 C/cm^2, respectively. The ,εr-t dependence of BGSPTx ceramics are performed, and its tc is 494 ℃ around MPB.