中温烧结BaTiO3基瓷的非均匀结构对εr－T特性的影响

Effect of Inhomogeneous Structure of BaTiO 3 based Ceramics Sintered at Medium Temperature on ε r T Dependence

含低熔物Ｂｉ２Ｏ３·ｎＴｉＯ２及ＰｂＯ－Ｂ２Ｏ３的ＢａＴｉＯ３基中温烧结瓷料，通过改性物Ｌａ、Ｎｂ等在固－液相烧结过程中溶－析和缺位补偿固溶，主晶相ＢａＴｉＯ３晶粒形成核－壳结构，并存在玻璃相。这种非均匀结构对铁电相的制约作用。

In medium temperature sintered BaTiO 3 based ceramics containing Bi 2O 3·nTiO 2 and PbO B 2O 3 core shell structure is formed in BaTiO 3 main crystal phase grain and the glass phase exists through melt separation out and vacancy compensation solid solution of modifiers La, Nb and the others in sintering process of solid liquid phase. This restriction of inhomogeneous structure on ferroelectric phase causes ε r T dependence of ceramics to change.