| With the rapid development of science and technology, more piezoelectric devices should be used in high-temperature environment. Commercial PZT piezoelectric ceramics have a low curie temperature, whose working temperature(< 150℃) is too low to be used in practice. So the current researches are focused on investigating and developing high curie temperature piezoelectric ceramics. As a kind of excellent high curie temperature piezoelectric ceramics, BiScO3-PbTiO3 system ceramics at MPB exhibit high curie temperature and piezoelectric properties. Pb(Mg1/3Nb2/3)O3-PbTiO3 system ceramics have excellent piezoelectric properties at MPB with low curie temperature(150℃).Addressed these issues, we introduce PMN to BSPT system, and the PMN-BS-PT ternary system ceramics with 10mol.%PT and 5mol.%PT were studied in this paper. Through the research of structure and properties near the two MPBs, we discussed the affect of PMN as a third component to the system.The results show that 0.1 PMN-BS-PT system with low PT content indicate a typical character of relaxor ferroelectrics, and it is transformed into normal ferroelectrics as increasing of PT content. Because of the low PMN content, 0.05PMN-BS-PT system doesn't indicate a typical character of relaxor ferroelectrics. With the growing of PT content, the curie temperature and coercive field of the two system increase, but the remanent polarization firstly increase and then decreasing. When the PT content is 56mol.%, the 0.1 PMN-BS-PT system show the optimal piezoelectric properties with d33=3/7pC/N, kp=0.49, Tc=361℃,Ec=20.64kV/cm, Pr=31.88μC/cm2. The 0.05PMN-BS-PT system with 59mol.% PT indicate the optimal piezoelectric properties with d33=487pC/N,kp=0.59, Tc=404℃, Ec=22.31kV/cm,Pr=34.73μC/cm2. So the introduction of PMN reduce the curie temperature; 10mol.% PMN indicate the"hard"behavior as a functon of reducing the piezoelectric properties; 5mol.% PMN indicate the"soft"behavior with increasing the piezoelectric properties. |
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