Microstructure and electrical properties of Ba_0.5Sr_0.5TiO₃ thin films prepared on copper foils with La₂O₃ buffer layers

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• 作者：Yanhua Fan ; Shuhui Yu ; Rong Sun ; Lei Li ; Ruxu Du ; Yansheng Yin
• 关键词：Thin films ; Sol– ; gel growth ; La₂O₃ buffer layer ; Diffusion ; Electrical properties
• 刊名：Applied Surface Science
• 出版年：2009
• 出版时间：30 July 2009
• 年：2009
• 卷：255
• 期：20
• 页码：8319-8323
• 全文大小：449 K

文摘

Ba_0.5Sr_0.5TiO₃ (BST) thin films were deposited on copper foils via sol–gel method with La₂O₃ as a buffer layer. The films were processed in almost inert atmosphere so that the substrate oxidation was avoided while allowing the perovskite film phase to crystallize. The existence of a La₂O₃ buffer layer between the BST thin film and Cu foil improved the dielectric constant and reduced the leakage current density of the BST thin film. Meanwhile, the BST thin film exhibited ferroelectric character at room temperature, which was contrast to the para-electric behavior of the film without the buffer layer. Effects of La₂O₃ buffer layer on the crystallizability and microstructure of BST thin films were also investigated.