掺La^(3+)对0.94(Na_(1/2)Bi_(1/2))TiO_3-0.06BaTiO_3陶瓷介电行为和压电性能的影响  

Dielectric Behavior and Piezoelectric Properties of La^(3+)-doping 0.94(Na_(1/2)Bi_(1/2))TiO_3-0.06BaTiO_3 Ceramics

作　　者：黎辉东[1] 冯楚德[1] 向平华[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2004年第3期579-585,共7页Journal of Inorganic Materials

基　　金：国家重点基础研究发展规划(2002CB613307)

摘　　要：对(Bi_(1/2)Na_(1/2))TiO_3-BaTIO_3压电陶瓷在准同型相界处的组成掺入不同量的La^(3+),研究掺杂对于体系结构、压电与介电性能的影响.结果表明,掺杂使得体系的弛豫铁电体特征更为明显,相变的弥散程度增大,室温下的介电常数增大;当掺杂量低于1.5％时,材料的d_(33)值增大,但同时介电损耗也相对于基体有所增加.当掺杂量达到 3％以后,陶瓷的压电性能严重降低.(1-x)(Na1/2Bi1/2)TiO3-xBaTiO(3) (x=0.06) with 1similar to5 at.% lanthanum was prepared by the conventional mixed oxide method. The effect of La3+ doping on dielectric behavior and piezoelectric properties of the ceramics was studied. The relaxor behavior of the La3+-doped ceramics is more evident. At room temperature, the dielectric constant is increased. When the La content is less than 1.5 at.%, the piezoelectric properties are enhanced. But in the meantime the dielectric loss of the ceramics is also increased. When the content of La3+ is up to 3 at.%, the ceramics' piezoelectric properties are remarkably debased.

关 键 词：钛酸铋钠 无铅压电陶瓷 弛豫铁电体 弥散相变 

分 类 号：TM282[一般工业技术—材料科学与工程]