Sandwich-type composite multilayer films of strontium titanate and barium strontium titanate and their controllable dielectric properties  

作　　者：Wenlong Liu Lin Tao Wei Feng Jiaxuan Liao Lingzhao Zhang 

机构地区：[1]School of Food and Biological Engineering,Chengdu University,Chengdu,610106,China [2]Yangtze Delta Region Institute(Quzhou),University of Electronic Science and Technology of China,Quzhou,Zhejiang 324000,China [3]School of Mechanical Engineering,Chengdu University,Chengdu,610106,China

出　　处：《Journal of Materials Science & Technology》2021年第26期245-254,共10页材料科学技术（英文版）

基　　金：financially supported by the Key Project of National Natural Science Foundation of China(No.11832007);the Applied Basic Research Program of Sichuan(No.19YYJC1846);the Science and Technology Achievement Transfer and Transformation of Sichuan(No.20ZHSF0154)。

摘　　要：It is a challenge to reduce the dielectric loss and increase the tunability of pure barium strontium titanate(BST)films for microwave tunable application because these two properties change simultaneously.Herein,a novel composite of strontium titanate(ST)and potassium-doped BST(KBST)has been designed as ST/KBST/ST sandwich-type film with various ST and KBST layers.X-ray diffraction patterns show that the film exhibits cubic perovskite polycrystalline structure composed of BST and ST phase,mainly grow along(110)crystal plane with average grain size of less than 20 nm and decreasing BST phase/ST phase ratio with increasing film thickness.Scanning electron microscope shows that no interfacial layer can be observed,indicating that ST and KBST are fully compounded.Low dielectric loss and high tunability at-10-10 V and stable and excellent dielectric properties at 1 GHz are achieved,meeting the needs of microwave tunable application at high frequency.The surface structures are also studied by other analysis methods,and ST/MgBST/ST sandwich-type film is compared.

关 键 词：ST/KBST/ST SANDWICH-TYPE Multilayer film Controllable dielectric performance High frequency application 

分 类 号：TB383.2[一般工业技术—材料科学与工程]