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Local structure determination of amorphous materials through parallel nano beam electron diffraction

Research Project

Project/Area Number 18J20215
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Nanomaterials engineering
Research InstitutionOkinawa Institute of Science and Technology Graduate University
Research Fellow 所(シュライバー) 真人  沖縄科学技術大学院大学, 科学技術研究科, 特別研究員(DC1)
Project Period (FY) 2018-04-25 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2020: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2019: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2018: ¥800,000 (Direct Cost: ¥800,000)
Keywordsamorphous / diffraction / electron microscopy / clustering / structure / glass / materials structures / electron nanodiffraction / single particle / disordered
Outline of Annual Research Achievements

Progress was made in treatment of 2D class-average diffraction patterns in order to remove diffuse ring signals caused by non-aligned signals. This allows for isolation of structural features from structural motifs for further processing into 3D. Diffraction patterns were simulated from amorphous structures produced by molecular dynamics and from isolated atomic clusters to compare with the experimental patterns. In both cases there are differences with experimental patterns and class-averages arising from the simulations limited volume size and tiling artifacts. Tests were made with various phase retrieval algorithms for their ability to recover phases from diffraction patterns with limited signal and noise. The Oversampling smoothness algorithm was the best performing algorithm among the tested for realistic data. To better match the experimental data, the finite convergence of the probe beam should also be taken into account and has yet to be implemented. Clustering algorithms such as SLICEM were tested for separating out class-averaged diffraction patterns into those originating from different structures. While clusters could be achieved for the experimental data, when tested with simulated data, the clustering accuracy was found to be very low. Different clustering algorithms developed for non-periodic diffraction data will be required. The ability to orient 2D patterns into a 3D diffraction pattern was tested and found to be possible on the experimental data although methods to fill in the gaps between 2D planes will be required.

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report

Research Products

(5 results)

All 2020 2019 2018

All Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Presentation] Measurement Dominant Local Structures in Amorphous Materials Using Nanobeam Electron Diffraction2020

    • Author(s)
      M. T. Schreiber, M. Wolf
    • Organizer
      American Physical Society March Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurement of charging dynamics in transmission electron microscopy by Fresnel fringes2019

    • Author(s)
      M. T. Schreiber, M. Bellegia, A. Maigne, M. Wolf
    • Organizer
      Student Conference on Light 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Local structural information on amorphous materials through electron diffraction2019

    • Author(s)
      M. T. Schreiber, Matthias Wolf
    • Organizer
      69th Lindau Nobel Laureate Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temporal Charging Dynamics Induced by the Electron Beam on Vitreous Ice2019

    • Author(s)
      M. T. Schreiber, A. Maigne, M. Wolf
    • Organizer
      Microscopy Society of Canada Annual Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Temporal Dynamics of Charging Effects in Vitreous Ice in Biological Electron Microscopy2018

    • Author(s)
      M. Schreiber, A. Maigne, M. Wolf
    • Organizer
      19th International Microscopy Congress,
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2018-05-01   Modified: 2021-12-27  

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