【摘要】 采用固相反应法制备了新型(0.95–x)Bi1/2Na1/2TiO3-0.05BaTiO3-xBiFeO3(x=0~0.09)系无铅压电陶瓷,研究了BiFeO3掺杂量对其晶体结构、介电及压电性能的影响。结果表明:在所研究的组成范围内陶瓷均能形成纯钙钛矿型固溶体。介温曲线(10kHz)显示该陶瓷体系具有明显的弥散相变特征。该陶瓷体系的压电性能较Bi1/2Na1/2TiO3-BaTiO3陶瓷(d33=125pC/N)有较大提高,当x=0.05时,具有最佳的压电性能:d33=142pC/N,kp=0.29;此时εr=891,tanδ=0.046,Qm=110。更多还原

【Abstract】 A new lead-free piezoelectric ceramics of (0.95–x)Bi1/2Na1/2TiO3-0.05BaTiO3-xBiFeO3 (x = 0 ~ 0.09) was prepared by conventional solid state reaction method. The effects of BiFeO3 doping amounts on the crystal structures, piezoelectric and dielectric properties of ceramics were investigated. The results indicate that the ceramics studied can form pure perovskite solid solutions. The relative permittivities as a function of temperatures at 10 kHz show obvious characteristic of diffused phase transition. Compared to Bi1/2Na1/2TiO3-BaTiO3 ceramics with d33 of 125 pC/N, the piezoelectric properties of this new ceramics is improved significantly. The optimal piezoelectric properties of d33=142 pC/N, kp = 0.29 are obtained at x = 0.05, and εr = 891, tanδ = 0.046, Qm=110.更多还原