(0.94-x)Bi_(0.5)Na_(0.5)TiO_3-0.06BaTiO_3-xLiNbO_3系无铅压电陶瓷的微结构和电性能研究  

Microstructure and electrical properties of (0.94-x)Bi_(0.5)Na_(0.5)TiO_3-0.06BaTiO_3-xLiNbO_3 lead-free piezoelectric ceramics

作　　者：周飞[1] 吴浪[1] 吴文娟[2] 滕元成[1] 李玉香[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]四川大学材料科学与工程学院,四川成都610064

出　　处：《功能材料》2011年第2期241-243,247,共4页Journal of Functional Materials

基　　金：国家自然科学基金面上资助项目(10775113);西南科技大学博士研究基金资助项目(08zx0112)

摘　　要：采用传统陶瓷工艺制备了(0.94-x)Bi0.5Na0.5TiO3-0.06BaTiO3-xLiNbO3(BNBT6-xLN,x=0～0.03)系无铅压电陶瓷,研究了LiNbO3的引入对BNBT6陶瓷微结构、铁电和压电性能的影响。X射线衍射分析表明,各组分均具有纯的钙钛矿结构。掺入适量LiNbO3可使陶瓷的晶粒变得更均匀,致密度增加。当x≤0.02时,剩余极化强度Pr随x增大略有降低;当x>0.02时,电滞回线出现变形,陶瓷内极性相和非极性相共存,Pr和矫顽场Ec都急剧下降。随着x的增加,压电常数d33先增大后减小,介电常数εr和介电损耗tanδ逐渐增大,退极化温度Td逐渐降低。当x=0.02时d33达到最大值150pC/N,此时kp=27%,Pr=34.1μC/cm2,Ec=28.8kV/cm。（0.94-x）Bi0.5Na0.5TiO3-0.06BaTiO3-xLiNbO3（BNBT6-xLN,x=0-0.03） lead-free piezoelectric ceramics were prepared by solid state reaction method.The microstructure,ferroelectric,and piezoelectric properties of BNBT6-xLN ceramics was investigated.The X-ray diffraction analysis shows that all of the ceramics have pure perovskite structure.The grain size becomes more identical and the density increases after the incorporation of certain amount of LiNbO3.For the ceramics with x≤0.02,the remanent polarization（Pr） reduces slightly with increasing x.When x0.02,the polar and non-polar phases may coexist in the ceramics at room temperature,resulting in a sharp decline in the Pr and coercive field（Ec）.With increasing x,both the dielectric constant（εr） and dielectric loss（tan） increase gradually,and the piezoelectric constant（d33） increases initially and then decreases.The ceramics with x=0.02 exhibit the optimum electrical properties：d33=150pC/N,kp=27%,Pr=34.1μC/cm2,Ec=28.8kV/cm.The depolarization temperature Td is shifted toward lower temperatures with increasing x.

关 键 词：无铅压电陶瓷 微结构 压电性能 铁电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]