Direct local structure determination of quasicrystals in physical space
Publicly Offered Research
Project Area | Hypermaterials: Inovation of materials scinece in hyper space |
Project/Area Number |
20H05273
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Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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Allocation Type | Single-year Grants |
Review Section |
Science and Engineering
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Research Institution | Hiroshima University |
Principal Investigator |
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Project Period (FY) |
2020-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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Keywords | Aperiodic crystals / local structure / atomic holography / x-ray holography / quasicrystal / atomic structure / local atomic environment / Hypermaterials / Atomic structure / X-ray holography |
Outline of Research at the Start |
The project contributes to understand complex atomic arrangements as found in quasicrystals using x-ray holography. This will establish a new way to visualize the intricate structures with a direct and element-selective approach and support existing models with complementary experimental data.
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Outline of Annual Research Achievements |
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, which uses a 2-dimensional area detector. With this system, a wide variety of target elements is now feasible for measurement.
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Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(19 results)