摘要
采用传统固相反应法制备了K0.49NaxNbO3（x=0.51~0.54）系无铅压电陶瓷,系统研究了Na过量对K0.49NaxNbO3陶瓷结构与压电、铁电性能的影响。研究结果表明：在研究的Na过量范围内,陶瓷样品具有单一的正交钙钛矿型晶体结构,但在x=0.52~0.53处晶格常数出现不连续的变化过程,表明该体系存在由两个不同正交晶相构成的准同型相界（MPB）,在MPB区域边界x=0.52处陶瓷具有优异的性能：d33=142 pC/N,Qm=146,εr=462,tanδ=0.026,kp=0.39。
The solid state reaction method was employed to fabricate K0.49NaxNbO3（x=0.51-0.54） system lead-free piezoceramic.The effect of excessive sodium on the crystal structure and piezoelectric,ferroelectric properties of K0.49NaxNbO3 ceramics was also investigated.The results indicate that all ceramic samples have a pure orthorhombic perovskite structure.The lattice parameters show a discontinuous change in the composition range of x=0.52-0.53,which are considered to be a morphotropic phase boundary（MPB） separating two different orthorhombic phases.The ceramic sample at the MPB composition of x=0.52 exhibits optimal electrical properties as follows： d33=142 pC/N,Qm=146,εr=462,tanδ=0.026,kp=0.39.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第1期61-64,共4页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(50962007)
江西省自然科学基金(2009GZC0063)
江西省教育厅青年科学基金资助项目(No.GJJ09533)
关键词
铌酸钾钠
无铅压电陶瓷
压电性能
准同型相界
alkaline niobate
lead-free piezoceramic
piezoelectric properties
morphtropic phase boundary
