对(Bi1/2Na1/2)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.
(1-x)(Na1/2Bi1/2)TiO3-xBaTiO3 (x=0.06) with 1-5 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.
参考文献
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