Octahedral Tilt Propagation Controlled by A-Site Cation Size at Perovskite Oxide Heterointerfaces

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• 作者：Ryotaro Aso ; Daisuke Kan ; Yuichi Shimakawa ; Hiroki Kurata
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：May 7, 2014
• 年：2014
• 卷：14
• 期：5
• 页码：2128-2132
• 全文大小：446K
• 年卷期：v.14,no.5(May 7, 2014)
• ISSN：1528-7505

文摘

A clear correlation between the A-site cation size and the octahedral tilt propagation from the substrates into the ATiO₃ (A = Ba²⁺, Sr²⁺, Sr²⁺_0.7Ca²⁺_0.3, and Sr²⁺_0.5Ca²⁺_0.5) epitaxial thin films was found from the observations of ATiO₃/GdScO₃ heterostructures using high-resolution annular bright-field scanning transmission electron microscopy. The in-plane oxygen displacements at the interface increase with decreasing the A-site cation size and facilitate the TiO₆ octahedral tilt propagation across the interface. The results highlight the significance of the A-site cation size as a controlling factor for structural distortions at oxide-based heterointerfaces.