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

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.