钛酸铋钠基无铅压电陶瓷晶粒生长机制的研究  

Study on the Grain Growth Mechanism of Na_(0.5)Bi_(0.5) TiO_3-based Lead-free Piezoelectric Ceramics

作　　者：姚永红[1] 高峰[1] 洪荣子[1] 成丽红[1] 田长生[1] 

机构地区：[1]西北工业大学材料学院

出　　处：《压电与声光》2008年第4期474-476,共3页Piezoelectrics & Acoustooptics

基　　金：航空科学基金资助项目(03G53036)

摘　　要：应用晶粒生长动力学唯象理论研究籽晶模板对0.94Na0.5Bi0.5TiO3-0.06 BaTiO3无铅压电织构陶瓷中等轴晶生长的影响规律,确定了等轴晶生长动力学指数和激活能,探讨了籽晶含量对无铅压电织构陶瓷等轴晶生长的作用机理。实验结果表明,当Bi2.5Na3.5Nb5O18的质量分数低于10%时,主要是界面反应控制机制;质量分数增加到15%时,以晶格扩散机制为主;质量分数增加到20%时,由晶格扩散机制转化为以晶界扩散机制为主;当其质量分数大于20%时,以界面反应机制为主。The grain growth of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 lead-free piezoelectric textured ceramics with the template was studied. The grain growth exponent and apparent activation energy were determined. The mechanism of equiaxial grains in 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 textured ceramics was discussed. The result shows that the grain growth mechanism is controlled by phase boundary reaction when the content of template is less than 10 %. It changes to grain lattice diffusion when the content template is increased to 15%. The mechanism is controlled by gain boundary diffusion at the content template of 20%. When the content of template is over 20%, it is controlled by phase boundary reaction.

关 键 词：无铅压电陶瓷 晶粒生长 激活能 

分 类 号：TM282[一般工业技术—材料科学与工程]