【摘要】 利用 SEM、TEM 和 EDAX 对添加 Li₂CO₃助烧的 SrTiO₃基晶界层电容器的显微结构、相组成及成份分布等进行观察和研究,结果表明,存在着由 CuO 扩散形成的绝缘晶粒边界和组份为Li₂O-TiO₂-SrO 的晶间液相组成的双晶界显微结构,晶间液相中有各种组成的 Li-Ti-O 析晶相.获得了 e_App>9×10⁴、tgδ<0.01、ρ>10¹⁰Ω·cm.ΔC/C<±15%（-30～+85℃）的晶界层电容器.更多还原

【Abstract】 The microstructure,phase composition and the element distributions of SrTiO₃-basedboundary-layer capacitor in the presence of Li₂CO₃ as sintering agent were studied by SEM,TEM and EDAX.The results showed that dual grain-boundary microstructure was present,which was composed of Li₂O-TiO₂-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 εApp>9×10⁴,tgδ<0.01,p>10¹⁰Ω.cm.ΔC/C<±15%（-30～+85℃）were obtained.更多还原