(Na,K)NbO_3基无铅压电陶瓷的线性组合规律  

Linear Combination Rule on (Na, K)NbO_3-based Lead-free Piezoelectric Ceramics

作　　者：赵笑昆[1] 张波萍[1] 杨曼莉[1] 时亮[1] 赵磊[1] 朱立峰[1] 周朋飞[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《硅酸盐学报》2013年第12期1662-1667,共6页Journal of The Chinese Ceramic Society

基　　金：高等学校博士学科点专项科研基金资助项目

摘　　要：采用传统烧结工艺，以具有多形态相变（PPT）结构的0.95（Na0.5K0.5）NbO3-0.05LiTaP3和0.95（Na0.5K0.5）NbO3-0.05LiSbO3为端元组分，按线性组合规律制备出（Na0.5K0.5）095Li0.05Ta0.05-xSbxNbO3（NKLNTSx）无铅压电陶瓷，研究了陶瓷的相结构、显微结构和电学性能的变化规律。NKLNTSx陶瓷均具有正交一四方共存的相结构，表明铌酸钾钠（N圈N）基陶瓷PPT相变适用线性组合规律。随sb含量增加，正交一四方相变温度降低至室温，PPT行为增强，晶粒生长受到抑制，晶粒尺寸由5岫n减小到2～3gm，样品密度由4.02g／cm^3降低到3.78g／cm^3。由于PPT行为的增强，NKLNTSx陶瓷在x=0.03处取得最优压电性能（d33=243pC／N，kp=40.7％）。剩余极化强度Pr随sb含量增加升高，矫顽场E降低。According to the Linear Combination Rule （LCR）, （Na0.5K0.5）0.95Li0.05Ta0.05-xSbxNbO3 （NKLNTSx） lead-free piezoelectric caramics were prepared with 0.95（Na0.5K0.5）NbO3-0.05LiTaO3 and 0.95（Na0.5K0.5）NbO3-0.05LiSbO3 with the polymorphic phase transition （PPT） structure as the end member compositions via a conventional solid-state route. The phase structure, microstructure and electrical properties were investigated. The orthorhombic and tetragonal co-existing phase structure was observed in the samples （x = 0-0.05） for the applicability of LCR on PPT behavior of （Na, K）NbO3 （NKN） based ceramics. The temperature for the orthorhombic-tetragonal phase transition shifts to room temperature when Sb content increases due to an enhanced PPT behavior of the NKLNTSx ceramics. The grain growth was suppressed by doping Sb in a refined grain size range from 5 μm to 2-3 μm and in a decreased mass density range from 4.02 g/cm^3 to 3.78 g/cm^3. The optimized piezoelectric properties were obtained in a sample （x= 0.03） with d33 of 243 pC/N and kp of 40.6% due to the enhanced PPT behavior. The Pr could increase and the Ec could decrease with increasing Sb content.

关 键 词：无铅压电陶瓷 铌酸钾钠 多形态相变 线性组合规律 

分 类 号：TB34[一般工业技术—材料科学与工程]