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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

Research Project

Project/Area Number 17F17719
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field Crystal engineering
Research InstitutionKyoto University

Principal Investigator

島川 祐一  京都大学, 化学研究所, 教授 (20372550)

Co-Investigator(Kenkyū-buntansha) HEO YOOUN  京都大学, 化学研究所, 外国人特別研究員
Project Period (FY) 2017-07-26 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2018: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2017: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordsヘテロ構造 / 遷移金属酸化物
Outline of Annual Research Achievements

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.

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (7 results)

All 2018 2017 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results) Remarks (3 results)

  • [Journal Article] Nanoscale oxygen ion dynamics in SrFeO3-d epitaxial thin films2018

    • Author(s)
      Y. Heo, D. Kan, and Y. Shimakawa
    • Journal Title

      Appl. Phys. Lett.

      Volume: 113 Issue: 22 Pages: 221904-221904

    • DOI

      10.1063/1.5046749

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Oxidation Induced Electrical Conduction of SrFeO2.52018

    • Author(s)
      Y. Heo, D. Kan, and Y. Shimakawa
    • Organizer
      ISAF-FMA-AMF-AMEC-PFM Joint Conference (IFAAP2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nanoscale oxygen ion dynamics in SrFeO3-d epitaxial thin films2018

    • Author(s)
      Y. Heo, D. Kan, and Y. Shimakawa
    • Organizer
      E-MRS Fall meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Resistive Switching Properties of Epitaxial BaTiO3-d Thin Films2017

    • Author(s)
      Y. Heo
    • Organizer
      Core-to-Core Workshop "From Basic to Application of Materials"
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 京都大学化学研究所、先端無機個体化学(島川)研究室

    • URL

      http://www.scl.kyoto-u.ac.jp/~shimakgr/index.html

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
  • [Remarks] Shimakawa group, ICR, Kyoto University

    • URL

      http://www.scl.kyoto-u.ac.jp/~shimakgr/indexE.html

    • Related Report
      2018 Annual Research Report
  • [Remarks] Shimakawa group, ICR, Kyoto Univ

    • URL

      http://www.scl.kyoto-u.ac.jp/~shimakgr/indexE.html

    • Related Report
      2017 Annual Research Report

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Published: 2017-07-28   Modified: 2024-03-26  

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