钠过量对铌酸钾钠基陶瓷结构及性能的影响  

The structure and properties of excess Na doping potassium sodium niobate based ceramics

作　　者：臧国忠[1] 孙天华[1] 王文文[1] 孙洪元[1] 仪修杰[1] 

机构地区：[1]聊城大学材料科学与工程学院,山东聊城252059

出　　处：《电子元件与材料》2009年第7期11-13,16,共4页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.50802038);山东省博士基金资助项目(No.2007BS04047)

摘　　要：用常规氧化物固溶法制备了(Na0.520+xK0.480)0.915Li0.085NbO3(x=0～0.025)无铅压电陶瓷,研究了过量Na的掺杂量对其烧结温度、微观结构及压电性能的影响。结果表明,过量Na掺杂在烧结过程中促进液相的产生,导致样品烧结温度显著降低。室温下样品均为四方结构。随x的增加,样品的斜方-四方相变温度tO-T趋向低温。当x从0.010增大到0.025时,Qm从131提高到238,tanδ和d33分别从0.034和125pC/N下降至0.012和105pC/N,表明过量Na实际上起到了"硬性掺杂"的作用。（Na0.520＋xK0.480）0.915Li0.085NbO3 （x = 0 - 0.025） lead-free piezoceramics were prepared using conventional oxide solid-solution technique, and the effects of excess Na doping amounts on the sintering temperatures, microstructures and piezoelectric properties of samples were investigated. The results indicate that excess Na doping facilitate the production of liquid phase during sintering and result in obvious decrease of sintering temperature of samples. All of the samples exhibit tetragonal structures at room temperature and a downward trend of orthorhombic-tetragonal phase transition temperature （to-r） with the increase of x. The increase of mechanical quality factor （Qm） from 131 to 238, the decrease of dielectric loss （tanδ） from 0.034 to 0.012 and the decrease of piezoelectric coefficient （d33） from 125 pC/N to 105 pC/N when x increases from 0.010 to 0.025, demonstrate that excess Na doping can lead to an effect of ＂hardness doping＂ on samples.

关 键 词：无机非金属材料 无铅压电陶瓷 铌酸钾钠 低温烧结 居里温度 

分 类 号：TM22[一般工业技术—材料科学与工程]