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Study on SrTiO_3-based Boundary Layer Capacitor with Li_2CO_3 Addition by Electron Microscopy

Zhou Heping Lu Xinmin Dong Weimin Li Longtu (Dept.of Materials Science & Engineering,Tsinghua University,100084)  
The microstructure,phase composition and the element distributions of SrTiO_3-basedboundary-layer capacitor in the presence of Li_2CO_3 as sintering agent were studied by SEM,TEM and EDAX.The results showed that dual grain-boundary microstructure was present,which was composed of Li_2O-TiO_2-SrO liquid phase layer and insulating layer formed by CuOdiffusion.The secondary crystalline phases were segregated from liqud phase.By optimizing the process the best dielectric characteristics with εApp9×10~4,tgδ0.01,p10~(10)Ω.cm.ΔC/C±15%(-30~+85℃)were obtained.
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