【摘要】 对(Bi_1/2Na_1/2)TiO₃-BaTIO₃压电陶瓷在准同型相界处的组成掺入不同量的La³⁺,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d₃₃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.更多还原

【Abstract】 (1-x) (Na_1/2Bi_1/2)TiO_3-xBaTiO₃ （x=0.06） with 1～5 at.% lanthanum was preparedby the conventional mixed oxide method. The effect of La³⁺ doping on dielectric behavior andpiezoelectric properties of the ceramics was studied. The relaxor behavior of the La³⁺- dopedceramics is more evident. At room temperature, the dielectric constant is increased. When theLa content is less than 1.5 at.%, the piezoelectric properties are enhanced. But in the meantimethe dielectric loss of the ceramics is also increased. When the content of La³⁺ is up to 3 at.%, theceramics’ piezoelectric properties are remarkably debased.更多还原