工艺条件对KNNT陶瓷性能的影响  

Influences of process conditions on properties of (K_(0.5)Na_(0.5))(Nb_(0.7)Ta_(0.3))O_3 ceramics

作　　者：吕应刚[1] 王春雷[1] 张家良[1] 王矜奉[1] 钮效鹍[1] 

机构地区：[1]山东大学物理与微电子学院,山东济南250100

出　　处：《电子元件与材料》2007年第9期18-20,23,共4页Electronic Components And Materials

基　　金：国家重点基础研究发展计划资助项目(2007CB607504);国家自然科学基金资助项目(10474057)

摘　　要：采用传统固相反应法制备了(K0.5Na0.5)(Nb0.7Ta0.3)O3(KNNT)无铅压电陶瓷。通过XRD、SEM分析方法分别研究了预烧后粉体和烧结后样品的晶体结构和微观形貌,以及预烧、烧结条件对样品性能的影响。结果表明,预烧后的粉体和烧结后的样品的晶体结构分别为四方相和斜方相;在860～920℃预烧,选择合适的烧结温度均可获得性能优异的陶瓷样品。较佳工艺条件为900℃预烧、1180℃烧结,样品d33可达到205pC/N,kp、k33分别为45.9%、60.5%。Lead-free piezoelectric ceramics of （K0.5Na0.5）（Nb0.7Ta0.3）O3 （KNNT） were prepared by the conventional solid -state reaction technique. The microstructures of the calcined powder and the sintered samples were characterized by XRD and SEM methods, respectively. The influence of calcining and sintering condition on the electrical properties of KNNT ceramics was investigated. The results show that the crystal structures of the calcined powder and the sintered samples are tetragonal and orthorhombic phase, respectively. In the calcined temperature range of 860～920 ℃, all the specimens sintered at their optimum temperature reveal optimized piezoelectric properties （d33≈200, kp≈45 %）. The KNNT ceramics, which are calcined at 900 ℃ and then sintered at 1 180 ℃, show the best piezoelectric properties of d33≈205 pC/N, kp≈45.9 % and k33≈60.5 %, respectively. This process condition may be the optimum one for the KNNT composition .

关 键 词：无机非金属材料 无铅压电陶瓷 (K Na)(Nb Ta)O3 固相反应法 压电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]