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ヘテロ構造化した遷移金属酸化物における新機能探求

异质结构过渡金属氧化物新功能的探索

基本信息

批准号：
17F17719
负责人：
島川祐一
金额：
$ 1.47万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2017
资助国家：
日本
起止时间：
2017-07-26 至 2019-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17719/
关键词：
ヘテロ構造遷移金属酸化物

项目摘要

本研究では、遷移金属酸化物中の酸素配位環境に着目し、酸素配位環境を制御することで、酸化物の新機能開発を目指してきた。原子層単位で成長を制御したブラウンミレライト構造SrFeO2.5エピタキシャル薄膜を作製し、これを空気中でアニールすることにより、酸素が取り込まれる過程を原子間力顕微鏡（AFM）の導電性からナノスケールレベルで観察することに初めて成功した。原子レベルでのステップ構造を持つSrFeO2.5では、その端点から酸素が取り込まれ、その後テラス構造の膜面を拡散していくことが明らかとなった。このような酸素イオンの拡散挙動過程をナノスケールレベルで解明したのは初めての例である。We fabricated as-grown oxygen deficient SrFeO2.5 thin films as a model system by pulsed laser deposition. Then, we applied air-annealing treatment in order to progressively induce oxidation to the samples. Our characterizations by x-ray diffraction and conducting-AFM reveal that the as-grown and annealed SrFeO2.5 films show structural and electronic transitions from insulating brownmillerite to metallic perovskite phases. Importantly, we observed a trend in nanoscale oxygen dynamics in SrFeO2.5, that is oxygen ions are preferably incorporated into the higher terraces near step edges during oxidation.

This study aims at the control of acid coordination environment in migrating metal acids and the development of new functions of acids. Atomic layer single site growth control system SrFeO2.5 thin film fabrication process, atomic force microscope (AFM) conductivity control system, atomic force microscope (AFM) conductivity control system and SrFeO2.5 thin film fabrication process, atomic force microscope (AFM) conductivity control system. The structure of the atom is composed of SrFeO2.5 and SrFeO2.5. The structure of the atom is composed of SrFeO2.5 and SrFeO2.5. There are examples of how the dispersion and movement process of this acid element can be explained through the use of information. We fabricated as-grown oxygen deficient SrFeO2.5 thin films as a model system by pulsed laser deposition. Then, we applied air-annealing treatment in order to progressively induce oxidation to the samples. Our characterizations by x-ray diffraction and conducting-AFM reveal that the as-grown and annealed SrFeO2.5 films show structural and electronic transitions from insulating brownmillerite to metallic perovskite phases. Importantly, we observed a trend in nanoscale oxygen dynamics in SrFeO2.5, that is oxygen ions are preferably incorporated into the higher terraces near step edges during oxidation.