复合钙钛矿结构高温压电陶瓷材料的研究

An Investigation on Piezoelectric Ceramic Materials of Composite Perovskite Structure for High Temperature Applications

研究了Ｐｈ（Ｃｄ１／３Ｎｂ２／３）Ｏ３，Ｂｉ２／３（Ｃｄ１／３Ｎｂ２／３）Ｏ３以及Ｂｉ（Ｃｄ１／２Ｔｉ１／２）Ｏ３改性的ＰｂＴＩＯ３陶瓷的高温压电性能．结果表明，对ＡＢＯ３型钙钛矿结构的ＰｂＴＩＯ３进行Ａ和Ｂ位复合取代可得到压电性能优良、适合于高温应用的压电陶瓷材料．其优良的压电性能及较好的温度稳定性与Ｂｉ３＋的半径、Ｂｉ３＋在Ａ位取代所产生的铅缺位以及Ｂ位复合取代的钙钛矿结构化合物较高的居里温度有关．

The high temperature piezoelectric properties of PbTiO3 ceramics modified with Pb (Cd1/3Nb2/3 )O3, Bi2/3 (Cd1/3Nb2/3)O3 and Bi (Cd1/2Ti1/2)O3 are investigated. Experimental results indicate that the excellent piezoelectric properties for high temperature applications can be obtained by the composite substitutions of A and B positions for PbTiO3 ceramics with ABO3 type perovskite structure. The excellent properties and fairly good temperature stability are dependent on the exterior electron structure,the ionic radius of Bi3+ and the Pb vacancy resulting from the substitution of Bi3+ ions at the A positions as well as the rather high Curie temperature of the chemical compound of composite perovskite structure at the B position substitution. The Curie temperature of the material series is 500℃ and over, and the dielectric constant ε≈200. Different requirements on the mechanical quality factor Qm and the electromechanical coupling factor Kt can be met by selecting different series.