| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
In this study, we made a heterostructure consisting of a brownmillerite SrFeO2.5 film and a fully oxygenated perovskite DyScO3 substrate. We found that a significant modification of oxygen coordination environments -melting of oxygen vacancy order- was induced at the heterointerface between SrFeO2.5 and DyScO3. When an oxygen-deficient perovskite (brownmillerite structure) SrFeO2.5 film grew epitaxially on a perovskite DyScO3 substrate, both FeO6 octahedra and FeO4 tetrahedra in the (101)-oriented SrFeO2.5 thin film connected to the ScO6 octahedra in DyScO3. As a consequence of accommodating structural mismatch, the alternately ordered arrangement of oxygen vacancies was significantly disturbed and reconstructed in the 2-nm-thick heterointerface region. The stabilized heterointerface structure consisted of Fe3+ octahedra with oxygen vacancy disorder. Detailed study on the ionic transport properties are still under way.
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