探讨了Nb2O5、NiO、Fe2O3掺杂量对三元系PMS-Pz-PT陶瓷的微观结构和电性能的影响.实验结果表明:随着掺杂量的增加,有一个共同的规律:物相组成由四方相向三方相转变;掺杂物在PMS-Pz-PT材料准同型相界区的固溶度比较小;适当的少量掺杂使εr、d33、Kp,等都有所提高.所不同的是,少量硬性掺杂和取代能提高Qm,而软性掺杂材料的Qm值却随着掺杂量的增加一直下降.改性后的组分具有良好的压电性能,能更好的满足超声马达实际使用的要求.
The microstructure and piezoelectric properties of Pb0.98Sr0.02(Mn1/3Sb2/3)x-(Zr0.5Ti0.5)1-xO3
ceramics with different dopants of Nb2O5, NiO, Fe2O3 and doping amounts were Investigated. Results show that phases shift from tetragonal phase to rhombohedral phase with the increase of doping amounts. The solubility
of B-site dopants in PMS-PZ-PT ceramics is very small. The compositions with small doping amount have optimized property values of d33, Kp and Qm. The Qm can be improved with small amount of acceptor
dopants, but deceases all through with the increase of Nb-doping concentration. The modified compositions have superior piezoelectric properties, so they are practically suitable for the applications in ultrasonic motors.
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