(Bi_(0.95)Na_(0.75)K_(0.2-x)Li_x)_(0.5)Ba_(0.05)TiO_3无铅压电陶瓷性质研究  

Piezoelectric properties of (Bi_(0.95)Na_(0.75)K_(0.2-x)Li_x)_(0.5)Ba_(0.05)TiO_3 lead-free ceramics

作　　者：王晓颖[1] 胡承忠[2] 杨鲲[3] 李子敬[1] 

机构地区：[1]燕山大学理学院,河北秦皇岛066004 [2]泰山学院物理与电子科学系,山东泰安271021 [3]山东大学物理与微电子学院,山东济南250100

出　　处：《泰山学院学报》2007年第3期83-87,共5页Journal of Taishan University

基　　金：国家自然科学基金资助项目(NO.0474057)

摘　　要：采用溶胶-凝胶法制备了(Bi0.95Na0.75K0.2-xLix)0.5Ba0.05TiO3(NBT-KBT-BT+xLi)微粉,并利用此微粉烧结出高密度无铅压电陶瓷.研究了陶瓷表面的显微结构,发现陶瓷主要组成为钙钛矿相结构,Li+的引入使陶瓷中产生呈针状的第二相.介电温谱表明该系列陶瓷是典型的弛豫型铁电体,居里温度在330℃附近.测量NBT-KBT-BT+xLi陶瓷的压电常数,发现当x=0.05时,样品的压电常数d33高达197 pC/N,机电耦合系数kt为0.33,损耗tanδ为0.05,相对电容率rε为789.Lead-free piezoelectric （Bi0.95 Na0.75 K0.2-x Lix ）0.5 Ba0.05 TiO3 ceramics have been obtained by sol-gel method. SEM photographs shows that the structure of the ceramics is perovskite-type and there is the second phase for Li^＋ doping. The temperature dependence of the relative dielectric constants εr, and dielectric loss tanδ of the NBT - KBT- BT ＋ xLi ceramics show that they are typical relaxor ferroelectrics. An optimized d33 = 197 pC/N and a relative dielectric constant εr = 789 have been obtained in （ Bi0.95 Na0.75 K0.15 Li0.05 ）0.5 Ba0.05 TiO3 ceramic and meanwhile the kt and the tanδ of the ceramic is 0. 33 and 0.05 respectively.

关 键 词：溶胶-凝胶法 显微结构 介电常数 压电常数 

分 类 号：D751[政治法律—政治学]