| 研究課題/領域番号 |
20K15027
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分26020:無機材料および物性関連
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| 研究機関 | 京都大学 (2023)
名古屋大学 (2022)
広島大学 (2020-2021) |
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研究代表者 |
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| 研究期間 (年度) |
2020-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
3,900千円 (直接経費: 3,000千円、間接経費: 900千円)
2023年度: 910千円 (直接経費: 700千円、間接経費: 210千円)
2022年度: 910千円 (直接経費: 700千円、間接経費: 210千円)
2021年度: 910千円 (直接経費: 700千円、間接経費: 210千円)
2020年度: 1,170千円 (直接経費: 900千円、間接経費: 270千円)
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| キーワード | x-ray holography / site-selectivity / local atomic structure / local disorder / local structure / atomic structure / local atomic environment |
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| 研究開始時の研究の概要 |
The project will develop an effective way to analyze local atomic environments with chemical information using x-ray holography. This site-selective information is a key to understand the structure-property relationships in materials particularly for complex systems.
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| 研究実績の概要 |
New advances in methods using x-ray fluorescence holography (XFH) have the potential to become a universal tool for site-selective investigations in crystals. These methods combine the intrinsic element-selectivity of XFH with the possibility for a chemical characterization of the environment. This is achieved by a resonant approach, i.e. tuning the x-ray energy to an energy that coincides with an x-ray absorption edge in the material.
The proposed project aims to practically implement such site-selective measurements and to apply them to current research issues in materials science. This approach is useful for, among else, identifying local atomic environments with chemical information and for understanding in detail the chemical disorder. One of the obstacles here is the atomic image cancellation effect, which leads to a large decrease in the signal intensity of certain pairs of distances and incident energies.
In this FY, the investigation using resonant XFH of a short-range-ordered Ni-Fe alloy was advanced. Furthermore, we investigated computationally the effect of various kinds of disorder on the holographic data to establish a reference for future experimental works. This approach was also employed to compare the data about local atomic disorder from holographic techniques with those from established methods like Diffuse Scattering. The XFH data are found to complement existing information well due to its site-selective properties.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The project is progressing smoothly. Experiments at large-scale research facilities were conducted as planned, and another 2 experiments for FY 2024 are already approved.
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| 今後の研究の推進方策 |
In the further course of this research, it is planned to apply the insight gathered so far for a complex functional material, which is a High Entropy Alloy consisting of 6 principal elements. The site-selective investigations developed here can significantly push forward the current knowledge about the structure of these highly topical material system. In particular, it will be interesting to investigate whether short-range atomic order exists between specific elements, which can have a major impact on the material properties.
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