Dielectric properties of low dielectric constant Ba_(0.60) Sr_(0.40)Mg_(0.15)Ti_(0.85)O_3-Mg_2TiO_4 composite thin films for tunable applications  

作　　者：GAO LiNa ZHAI JiWei YAO Xi 

机构地区：[1]Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China

出　　处：《Chinese Science Bulletin》2009年第13期2235-2238,共4页

基　　金：Supported by the National Program on Key Basic Research Project from the Ministry of Science and Technology of China (Grant No.2009CB623302);Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP20060247003);Shanghai Committee of Science and Technology (Grant No.07DZ22302)

摘　　要：Ba0.60Sr0.40Mg0.15Ti0.85O3-xmol%Mg2TiO4(x=0―40 mol%)(BSTM-MT) composite thin films were fabricated by sol-gel method.The precursor solution of these composite thin films was prepared through mixing the Ba0.60Sr0.40Mg0.15Ti0.85O3 and Mg2TiO4 solution.The microstructures and dielectric tunability of composite thin films were investigated.The dielectric constant of composite thin films can be tailored from 155 to 55 by changing the concentration of Mg2TiO4.The dielectric loss of these composite thin films were still kept below 0.01 and the tunability was above 20% at a dc-applied electric field of 500 kV/cm.Suitable dielectric constant,low dielectric loss,and high tunability of this kind of composite thin films can be useful for potential microwave tunable applications.Ba0.60Sr0.40Mg0.15Ti0.85O3-xmol%Mg2TiO4 （x = 0-40 mol%） （BSTM-MT） composite thin films were fabricated by sol-gel method. The precursor solution of these composite thin films was prepared through mixing the Ba0.80Sr0.40Mg0.15Ti0.85O3 and Mg2TiO4 solution. The microstructures and dielectric tunability of composite thin films were investigated. The dielectric constant of composite thin films can be tailored from 155 to 55 by changing the concentration of Mg2TiO4. The dielectric loss of these composite thin films were still kept below 0.01 and the tunability was above 20% at a dc-applied electric field of 500 kV/cm. Suitable dielectric constant, low dielectric loss, and high tunability of this kind of composite thin films can be useful for potential microwave tunable applications.

关 键 词：低介电常数 复合薄膜 可调谐 介电性能 应用 溶胶凝胶法 低介电损耗 薄膜制备 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业] TN41[电子电信—微电子学与固体电子学]