SrTiO_3基功能陶瓷的制备与特性研究

The Preparation and Characterization of SrTiO3-based Functional Ceramics

本文研究了气相扩散ＰｂＯ、Ｂｉ２Ｏ３、ＰｂＯ－Ｂｉ２Ｏ３使ＳｒＴｉＯ３基陶瓷基片晶界绝缘化，气相扩散ＰｂＯ－Ｂｉ２Ｏ３制备的陶瓷综合性能优良．讨论了气相扩散ＰｂＯ－Ｂｉ２Ｏ３的工艺条件对半导化ＳｒＴｉＯ３基陶瓷的介电性能（ε）、介电损耗（Ｄ）、非线性系数（α）及电阻率（ρ）的影响，用ＳＥＭ和ＥＰＡ对微观结构进行了观察和分析，结果显示ＰｂＯ和Ｂｉ２Ｏ３主要集中在晶界附近。用ＳｒＴｉＯ３气相扩散法成功地获得了ε＞３００００、Ｄ＜０．０１、α＞６．０、ρ＞５．０×１０１１的ＳｒＴｉＯ３基多功能陶瓷。

The reinsulation of grain boundary of SrTiO3-based ceramics with PbO or Bi2O3 or PbO-Bi2O3 was studied. The good comprehensive properties were achieved for the ceramic materials with PbO-Bi2O3. The effect of vapor phase diffusion with PbO-Bi2O3 on electrical properties of SrTiO3-based ceramics was discussed.The relationship between electrical properties ,such as dielectric constant(ε),dielectric loss(D),non-linear coefficient(α) and electric resistivity(ρ),and diffusion conditions was got. Microstructure was investigated by SEM. The distributions of element was examined by EPA. The results show that PbO.and Bi2O3 deposit most at grain boundary. The prepared ceramics have good electrical properties (ε>30000,D<0.01Ω·cm,α>6.0,ρ>5.0×1011).