复合氧化物纳米粉掺杂BaTiO_3基MLCC超细瓷料  

NANOCOMPOSITE DOPED BaTiO_3-BASED ULTRAFINE DIELECTRICS FOR MULTILAYER CERAMIC CAPACITANCE

作　　者：李波[1] 张树人[1] 周晓华[1] 王升[1] 唐斌[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,成都610054

出　　处：《复合材料学报》2005年第4期91-95,共5页Acta Materiae Compositae Sinica

摘　　要：采用新颖的纳米掺杂工艺成功制备了BaTiO3基MLCC超细抗还原瓷料。TG-DTA、XRD、TEM分析表明,通过水基溶胶-凝胶法合成了高分散、高活性的纳米掺杂剂,平均粒度约40.2nm。根据传统工艺与纳米掺杂工艺的比较,对纳米掺杂机理进行了研究。实验发现,由于纳米粉体的特殊效应,纳米掺杂工艺能更有效地提高掺杂原子的取代改性作用,从而更显著地改善瓷料的微观结构和宏观介电性能。样品经测试符合EIAX7R/X8R标准,其介电常数K25℃>2800、介质损耗tanδ<1.0%、绝缘电阻率IR=1012Ω.cm、平均晶粒尺寸Gav≈0.3μm。A novel nanu-doping process was introduced for the preparation of BaTiO3-based uhrafine nonreducible dielectrics for multilayer ceramic capacitance （MLCC）. According to TG-DTA, XRD and TEM analysis, the nanodopant prepared by the water-based sol-gel method was well dispersive and active. The nano-doping mechanism was investigated based on comparing conventional process with nano-doping process. It indicated that due to the special nano-effect, the modification effect of foreign atom was improved effectively and the microstructure and macro dielectric characteristics of so acquired ceramics were improved consequently. The resuhs show that high performance dielectrics are ohtained, with permittivity more than 2800, dielectric loss lower than 1.0% and average grain size about 0.3 μm, which satisfies the requirements of E1A X7R/X8R specifications.

关 键 词：钛酸钡 多层陶瓷电容器 水基溶胶-凝胶法 复合氧化物纳米粉 纳米掺杂工艺 

分 类 号：TB332[一般工业技术—材料科学与工程]