激光制备高介CaTiO_3-CaTiSiO_5高频介质陶瓷  

Laser sintered high-frequency dielectric ceramics of CaTiO_3-CaTiSiO_5 with high dielectric constant

作　　者：田得雨[1] 晁明举[1] 张俊吉[1] 李明玉[1] 钱华丽[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052

出　　处：《激光杂志》2011年第5期32-34,共3页Laser Journal

基　　金：国家自然科学基金(51072238)资助项目

摘　　要：采用激光烧结技术成功制备致密、高介电常数的CaTiO3-CaTiSiO5高频介质陶瓷。使用X射线衍射仪、扫描电子显微镜分析样品的晶相组成和显微组织,利用精密阻抗分析仪测试陶瓷样品的介电性能。结果表明,激光烧结CaTiO3-CaTiSiO5介质陶瓷致密、介电常数(rε=376)高达固相烧结样品的5倍,这应归因于激光烧结CaTiO3-CaTiSiO5介质陶瓷的特殊晶相结构——逆热流方向择优生长、尺寸达数百μm的定向排列结构。High- frequency dielectric ceramics CaTi03 - CaTiSiO5 with high dielectric constant was successfully prepared by laser sintering. The mierastructure observation and phase analysis of the CaTiO3 - CaTiSiO5 ceramics were performed by a scanning electron microscopy and X - ray diffiractometer. And the dielectric property was measured by precision impedance analyzer. The results show that the CaTiO3 - CaTiSiO5 ceramics by laser sintering has high dielectric constant （ εr = 376 ）, which is as high as 5 times that of one sintered with a furnace. This could be attributed to the CaTiO3 - CaTiSiO5 by laser sintering possesses a special mierostructure, namely an oriented dendrites growing against the heat exchange, which size can be hundreds of micron.

关 键 词：激光烧结 高频介质陶瓷 CaTiO3-CaTiSiO5 介电性能 

分 类 号：TN249[电子电信—物理电子学]