该文采用固相反应法成功合成了高性能MnO2掺杂的0.07Pb(Sc1/2Nb1/2)O3-0.93Pb(Hf0.47Ti0.53)O3(PSN-PHT)陶瓷, 并从微观形貌、相结构和电学性能等方面综合分析了PSN-PHT陶瓷性能提高的原因。实验结果表明, MnO2的引入改变了PSN-PHT陶瓷的相结构, 使其铁电四方相含量降低, 并导致准同型相界(MPB)的出现, 同时增大了晶粒尺寸并使晶粒均匀化。当MnO2掺杂量(摩尔分数)为0.8%时, 样品达到最佳性能, 其d33、kp、TC、Qm和tan δ分别为450 pC/N、0.65、348 ℃、1 200和0.003 2。该组分样品的温度稳定性远高于商用PZT-5和PZT-8陶瓷, 故其在压电陶瓷换能器领域有着巨大的应用前景。

In this paper, high performance 0.07Pb(Sc1/2Nb1/2)O3-0.93Pb(Hf0.47Ti0.53)O3(PSN-PHT) ceramics were successfully synthesized by solid state reaction method, and the improvement of PSN-PHT ceramic properties by MnO2 doped was comprehensively analyzed from the aspects of microstructure, phase structure and electrical properties. The experimental results show that the addition of MnO2 changes the phase structure of PSN-PHT ceramics, reduces the content of ferroelectric tetragonal phase, and leads to the appearance of crystalline phase boundary (MPB). At the same time, the addition of MnO2 can increase the grain size and homogenize the grain. When the doping amount of MnO2 is 0.8 mol%, the sample achieves the best performance, and its d33、kp、TC、Qm and tanδ were 450 pC/N, 0.65, 348 ℃, 1 200 and 0.003 2 respectively. In particular, the temperature stability of PSN-PHT-0.8Mn samples is much higher than that of commercial PZT-5 and PZT-8 ceramics. It has a great application prospect in the field of piezoelectric ceramic transducers.