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2020 年度 実績報告書

Direct local structure determination of quasicrystals in physical space

公募研究

研究領域ハイパーマテリアル:補空間が創る新物質科学
研究課題/領域番号 20H05273
研究機関広島大学

研究代表者

STELLHORN JENSRUEDIGER  広島大学, 先進理工系科学研究科(工), 助教 (90868431)

研究期間 (年度) 2020-04-01 – 2022-03-31
キーワードHypermaterials / Atomic structure / X-ray holography / local structure / quasicrystal
研究実績の概要

This project contributed to the understanding of complex atomic arrangements of hypermaterials using atomic-resolution X-ray holography. This method circumvents the phase problem of traditional crystallography, thus providing unique 3-dimensional structure information in a direct manner (i.e. without the need for an a-priori model or data refinement). It represents new way to visualize intricate aperiodic structures with an element-selective approach and to support existing models with complementary experimental data (in addition to e.g. superspace crystallography approaches).
The experiments using large-scale synchrotron facilities were performed for several decagonal and icosahedral quasi-crystalline systems. The data could be interpreted as 3-dimensional local pair distribution functions in the range of about 2 nm around a specific element. These features represent distinct advantages in contrast to comparable methods aimed at local structure characterization like X-ray absorption spectroscopy. It could also be demonstrated that the 3D data also indicate distinct structural features, for example the connectivity between the icosahedral clusters, which are difficult to determine by traditional crystallographic and spectroscopic approaches.
Furthermore, a new detecting system was introduced in the previous fiscal year, which uses a 2-dimensional area detector. With this system, a wide variety of target elements is now feasible for measurement.

現在までの達成度 (区分)
現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

Even despite several delays regarding experimental plans (due to the travel restrictions caused by the pandemic), the aims of the project were achieved and even surpassed.
Regarding the original project plan, a new detecting system using a 2-dimensional detector was successfully introduced, which possesses an excellent performance especially for the more challenging high-energy applications. Furthermore, experiments for reference samples of decagonal and icosahedral quasi-crystalline systems were successfully performed, and the theoretical groundwork for the interpretation of the data was established.
Beyond the original plan, we started measurements of a novel type of icosahedral systems with the composition Cd-Mg-Tb, in collaboration with a research group at the IMR (Tohoku University).

今後の研究の推進方策

In the ongoing research, the description of the local structure of especially icosahedral systems will be developed further, for example by comparison with detailed computational modelling of specific atomic environments. Moreover, in the future, the experimental and analytical methods developed in this project will be extended particularly to low-temperature and nano-focus applications. This will greatly widen the range of application of the experimental method to most quasi-crystalline systems that are interesting for state-of-the-art research. In particular, by using a quantitative approach of ARH, it will be possible to study the relationship between local distortions and material properties (in particular regarding magnetic effects).
Integrated with complementary material characterizations, the expected results will be able enable a whole new perspective for the understanding of the structure-property relationships in the studied materials.

  • 研究成果

    (14件)

すべて 2022 2021 2020 その他

すべて 国際共同研究 (2件) 雑誌論文 (1件) (うち査読あり 1件) 学会発表 (11件) (うち国際学会 2件、 招待講演 1件)

  • [国際共同研究] Science et Ingenierie des Materiaux/et Procedes/SIMaP(フランス)

    • 国名
      フランス
    • 外国機関名
      Science et Ingenierie des Materiaux/et Procedes/SIMaP
  • [国際共同研究] Philipps University Marburg(ドイツ)

    • 国名
      ドイツ
    • 外国機関名
      Philipps University Marburg
  • [雑誌論文] The Local Structure of the Fibonacci Chain and the Penrose Tiling from X-Ray Fluorescence Holography2021

    • 著者名/発表者名
      Stellhorn Jens R.、Takakura Hiroyuki、Hosokawa Shinya、Hayashi Kouichi
    • 雑誌名

      Materials Transactions

      巻: 62 ページ: 342-349

    • DOI

      10.2320/matertrans.MT-MB2020005

    • 査読あり
  • [学会発表] X-ray fluorescence holography to study the 3D local structure in aperiodic crystals2022

    • 著者名/発表者名
      J. R. Stellhorn, S. Hosokawa, K. Hayashi, K. Kimura, N. Happo, N. Fujita, S. Ohhashi, F. Labib, M. de Boissieu
    • 学会等名
      14th International Conference on Synchrotron Radiation Instrumentation (SRI 2022)
  • [学会発表] Recent progress of Atomic Resolution Holography for icosahedral systems2022

    • 著者名/発表者名
      J. R. Stellhorn, K. Kimura, K. Hayashi, N. Happo, N. Fujita, S. Ohhashi, M. de Boissieu
    • 学会等名
      8th Hypermaterials Meeting
  • [学会発表] Local 3-dimensional structure around Yb in the icosahedral Ag-In-Yb system2021

    • 著者名/発表者名
      Jens R. Stellhorn
    • 学会等名
      6th Hypermaterials Meeting
  • [学会発表] Atomic resolution holography for characterizing the local structure in quasicrystals2021

    • 著者名/発表者名
      J. R. Stellhorn, S. Hosokawa, K. Kimura, K. Hayashi, N. Boudet, N. Blanc, G. Chahine, M. de Boissieu
    • 学会等名
      25th Congress of the International Union of Crystallography (IUCr Congress 2021)
    • 国際学会
  • [学会発表] Insights into Aperiodic Structures by Atomic Resolution Holography2021

    • 著者名/発表者名
      J. R. Stellhorn, S. Hosokawa, K. Kimura, K. Hayashi, K. Ohoyama, N. Fujita, M. de Boissieu
    • 学会等名
      IRN-Aperiodic 2021 (International Research Network Open space between aperiodic order and physics & chemistry of materials)
    • 国際学会
  • [学会発表] The Local Atomic Structure of Quasicrystals investigated by X-Ray Fluorescence Holography2021

    • 著者名/発表者名
      J. R. Stellhorn, S. Hosokawa, K. Kimura, K. Hayashi, N. Happo, N. Boudet, N. Blanc, N. Fujita, M. de Boissieu
    • 学会等名
      Materials Research Meeting (MRM2021)
  • [学会発表] Experimental Investigation of the Local Atomic Structure in Decagonal Quasicrystals by X Ray Fluorescence Holography2020

    • 著者名/発表者名
      Jens R. Stellhorn
    • 学会等名
      24th Quasicrystals meeting
    • 招待講演
  • [学会発表] Direct local structure determination of quasicrystals in physical space2020

    • 著者名/発表者名
      Jens R. Stellhorn
    • 学会等名
      3rd Hypermaterials Meeting
  • [学会発表] X-ray holography for quasicrystals - a theoretical approach2020

    • 著者名/発表者名
      Jens R. Stellhorn
    • 学会等名
      4rd Hypermaterials Meeting
  • [学会発表] Atomic structure determination by X-ray holography2020

    • 著者名/発表者名
      Jens R. Stellhorn
    • 学会等名
      Physical Property Science Cross-disciplinary study group
  • [学会発表] Atomic-scale holography for decagonal quasicrystals2020

    • 著者名/発表者名
      Jens R. Stellhorn
    • 学会等名
      5th Hypermaterials Meeting

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公開日: 2022-12-28  

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