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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

掺La3+对0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3陶瓷介电行为和压电性能的影响

黎辉东; 冯楚德; 向平华   

  1. 中国科学院上海硅酸盐研究所 上海 200050
  • 收稿日期:2003-04-24 修回日期:2003-05-29 出版日期:2004-05-20 网络出版日期:2004-05-20

Dielectric Behavior and Piezoelectric Properties of La3+-doping 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 Ceramics

LI Hui-Dong; FENG Chu-De; XIANG Ping-Hua   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2003-04-24 Revised:2003-05-29 Published:2004-05-20 Online:2004-05-20

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摘要： 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.

关键词: 钛酸铋钠, 无铅压电陶瓷, 弛豫铁电体, 弥散相变

Abstract: (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.

Key words: （Na1/2Bi1/2）TiO3, lead-free piezoelectric ceramics, relaxor, diffuse phase transition

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