2016 Fiscal Year Final Research Report
Control of oxide-ion conductivity in oxide heterostructure thin films
| Project/Area Number |
15K13670
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Functional solid state chemistry
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 機能性酸化物 / 薄膜 / イオン伝導 |
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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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| Free Research Field |
固体化学
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