面向超声压电换能器的MnO_(2)掺杂Pb(Sc,Nb)O_(3)-Pb(Hf,Ti)O_(3)陶瓷研究

Study on MnO_(2)Doped Pb(Sc,Nb)O_(3)-Pb(Hf,Ti)O_(3)Ceramics for Ultrasonic Piezoelectric Transducers

该文采用固相反应法成功合成了高性能MnO_(2)掺杂的0.07Pb(Sc_(1/2)Nb_(1/2))O_(3)-0.93Pb(Hf_(0.47)Ti_(0.53))O_(3)(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,MnO_(2)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MnO_(2)掺杂量(摩尔分数)为0.8%时,样品达到最佳性能,其d_(33)、k_(p)、T_(C)、Q_(m)和tanδ分别为450 pC/N、0.65、348℃、1200和0.0032。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(Sc_(1/2)Nb_(1/2))O_(3)-0.93Pb(Hf_(0.47)Ti_(0.53))O_(3)(PSN-PHT)ceramics were successfully synthesized by solid state reaction method,and the improvement of PSN-PHT ceramic properties by MnO_(2)doped was comprehensively analyzed from the aspects of microstructure,phase structure and electrical properties.The experimental results show that the addition of MnO_(2)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 MnO_(2)can increase the grain size and homogenize the grain.When the doping amount of MnO_(2)is 0.8 mol%,the sample achieves the best performance,and its d_(33)、k_(p)、T_(C)、Q_(m)and tanδwere 450 pC/N,0.65,348℃,1200 and 0.0032 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.