Li_2CO_3助烧的SrTiO_3基晶界层电容器的研究  

The Study of SrTiO_3-Based BLC Added Li_2CO_3 as a Sintering Aid

作　　者：周和平[1] 陆新民[1] 董为民 李龙土[1] 

机构地区：[1]清华大学材料科学与工程系

出　　处：《现代技术陶瓷》1994年第1期3-10,共8页Advanced Ceramics

摘　　要：本文研究了烧结助剂Li_2CO_3对SrTiO_3基晶界层电容器的显微结构的影响。结果表明,晶间存在Li_2O—TiO_2—SrO液相,并有LiTiO_2、Li_4TiO_4等多种微晶析出;该液相有利于CuO扩散形成高绝缘的中间相层;晶格常数的精确测定表明少量Li^+进入SrTiO_3的A位。在1200℃下烧结可获得∑app>9×10~4、tgδ<0.01、ρ>10^(10)Ω·cm、△C/C<±15％(-30℃～+85℃)的晶界层电容器。The effect of Li2CO3 as a sintering aid upon the microstructure of SrTiO3-based boundary-layer capacitors has been studied. The results show that in the grain boundary there is Li2O-TiO2-SrO liquid phase, and many kinds of microcrystal (LiTiO2. Li4TiO4, etc. ) have been segregated , the liquid phase is effective on improving the insulation of the grain boundary phase. The result of the accurate measurement of lattice constants of SrTiO3 expressed that the Li+ can enter the A site of Sr-TiO3. The boundary-layer capacitor with Σαρ>9×104. thδ<0.01. ρ>1010Ω?cm and △C/C<≤± 15% (-30℃-+85℃) have been obtained by sintering at 1200℃.

关 键 词：晶界层电容器 钛酸锶 碳酸锂 

分 类 号：TM534[电气工程—电器]