Topotactic Changes in Thin Films of Brownmillerite SrFeO2.5 Grown on SrTiO3 Substrates to Infinite-Layer Structure SrFeO2

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• 作者：Yuichi Shimakawa ; Satoru Inoue ; Mitsutaka Haruta ; Masanori Kawai ; Kazuya Matsumoto ; Aya Sakaiguchi ; Noriya Ichikawa ; Seiji Isoda ; Hiroki Kurata
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：November 3, 2010
• 年：2010
• 卷：10
• 期：11
• 页码：4713-4715
• 全文大小：716K
• 年卷期：v.10,no.11(November 3, 2010)
• ISSN：1528-7505

文摘

A brownmillerite SrFeO_2.5 thin film grown on a SrTiO₃(001) substrate contained an a-axis-oriented single-crystalline domain near the substrate and multiple domains with three orthogonal orientations. When the film was reduced with CaH₂, it changed topotactically to a homogeneous c-axis-oriented infinite-layer structure, SrFeO₂. A brownmillerite SrFeO_2.5 thin film grown on a SrTiO₃(111) substrate and treated with CaH₂ at 250 °C also changed to (111)-oriented SrFeO₂ with an infinite-layer structure. During reduction at low temperatures, the framework of the perovskite-structure stays intact, some oxygen atoms are removed from it, and others are rearranged.