PVP添加剂改善溶胶-凝胶法制备BST薄膜表面结构及介电性能  

Surface Structures and Dielectric Properties of Polyvinyl Pyrrolidone-added Ba_(0.6)Sr_(0.4)TiO_3 Films Prepared by Improved Sol-gel Method

作　　者：张佳[1] 廖家轩[1] 潘笑风[1] 王洪全[1] 傅向军[1] 魏雄邦[1] 

机构地区：[1]电子科技大学电子科学技术研究院,成都610054

出　　处：《硅酸盐通报》2009年第B08期90-93,共4页Bulletin of the Chinese Ceramic Society

基　　金：电子科技大学中青年学术带头人培养计划(No.Y02018023601053);博士点基金(20060614021);四川省应用基础研究项目(2008JY0057)

摘　　要：以聚乙烯吡咯烷酮(polyvinyl pyrrolidone,PVP)为添加剂采用改善的溶胶凝胶法制备了Ba0.6Sr0.4TiO3(BST)薄膜,并采用扫描电镜(SEM)及原子力显微镜(AFM)研究了薄膜的表面结构与介电性能。结果表明:PVP显著改善了BST薄膜的表面形貌,当PVP:Ti的物质的量比为0.7%时,BST薄膜表面形貌最佳,光滑致密无裂纹无缩孔。X射线光电子能谱(XPS)表明,PVP有助于减少BST薄膜表面非钙钛矿结构。介电性能测试表明,在40V外加电压下BST薄膜的介电调谐率达45%,零偏压下的介电损耗低于0.02。另外,对PVP的作用机理进行了讨论。Polyvinyl pyrrolidone （PVP）-added barium strontium titanate （BST） films were prepared by improved sol-gel method. The surface structures and dielectric properties of the films were studied. SEM and AFM exhibit that the as-prepared BST films show significantly improved surface morphologies. As the mol ratio of PVP/Ti is around 0.7% , BST films are smooth and compact with no crack or shrinkage cavity. XPS illustrates that PVP is beneficial to reduce film surface non-perovskited structure. Meanwhile, the BST films show tunability of more than 45% at 40 voltage, and dielectric loss （tan） of less than 0.02 at zero bias. The related mechanism of PVP is discussed.

关 键 词：改善溶胶凝胶法 钛酸锶钡薄膜 聚乙烯吡咯烷酮(PVP) 介电性能 

分 类 号：O484[理学—固体物理]