BiFeO_3改性Bi_(1/2)Na_(1/2)TiO_3-BaTiO_3基陶瓷电性能  

Electrical properties of Bi_(1/2)Na_(1/2)TiO_3-BaTiO_3 ceramics modified by BiFeO_3

作　　者：王洋[1] 刘心宇[1,2] 周昌荣[1,2] 黄晋[1] 

机构地区：[1]桂林电子科技大学信息材料科学与工程系,广西桂林541004 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《电子元件与材料》2009年第8期14-16,共3页Electronic Components And Materials

基　　金：广西自然科学基金资助项目(No.桂科自0447092);信息材料广西重点实验室主任基金资助项目

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εf=891，tanδ=0．046，Qm=110。A new lead-free piezoelectric ceramics of （0.95-x）Bi1/2Na1/2TiO3-BaTiO3-xBiFe03 （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.

关 键 词：无机非金属材料 Bi1/2Na1/2TiO3-BaTiO3 固溶体 电畴 弥散相变 

分 类 号：TM282[一般工业技术—材料科学与工程]