硅酸盐学报2011，Vol.39Issue(7)：1155-1159,5.
K0.5Na0.5NbO3-BaCu0.5W0.5O3无铅压电陶瓷的结构与性能
Structure and Properties of K0.5Na0.5NbO3-BaCu0.5W0.5O3 Lead-Free Piezoelectric Ceramics
摘要
Abstract
(1-x)K0.5Na0.5NbO3-xBaCu0.5W0.5O3[(1-x)KNN-Xbcw] lead-free piezoelectric ceramics were fabricated by the traditional solid state reaction method. Crystal structure and electrical properties of K0.5Na0.5NbO3 (KNN) ceramics were investigated with different BCW contents (x = 0, 0.1%, 0.25%, 0.5%, and 1%, in mole, the same below). Results show that KNN ceramics have an ortho-rhombic perovskite structure after doping with a small amount (x<0.5%) of BCW. Sintering temperature of KNN ceramics after doping BCW decreases and relative density increases demonstrably compared with pure KNN. Furthermore, piezoelectric constant d33, electromechanical planar coupling factor kp, and mechanical quality factor Qm increase first and then decrease promptly with the increase of BCW contents. The relative density of the sample with x = 0.25% is 98.2% and it exhibits optimal properties: dielectric loss tan δ=0.031, relative permittivity εr=450, d33 = 128 Pc/N, kp = 0.40, and Qm=201.关键词
无铅压电陶瓷/铌酸钾钠/相对密度/压电性能Key words
lead-free piezoelectric ceramics/ potassium sodium niobate/ relative density/ piezoelectric property分类
化学工程引用本文复制引用
江向平,卫巍,陈超,涂娜,余祖灯,李小红..K0.5Na0.5NbO3-BaCu0.5W0.5O3无铅压电陶瓷的结构与性能[J].硅酸盐学报,2011,39(7):1155-1159,5.基金项目
国家自然科学基金(50862005,51062005,91022027):江西省自然科学基金(2008GZC0009,2009GQC0065) （50862005,51062005,91022027）
江西省教育厅(GJJ10027,GJJ11196,GJJ11197) （GJJ10027,GJJ11196,GJJ11197）
江西省高等学校“先进陶瓷材料”科技创新团队及江西省主要学科学术和技术带头人培养对象计划(2010DD00800)资助项目. （2010DD00800）
