| 研究課題/領域番号 |
16H04539
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| 研究機関 | 九州大学 |
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研究代表者 |
エダラテイ カベー 九州大学, カーボンニュートラル・エネルギー国際研究所, 助教 (60709608)
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| 研究期間 (年度) |
2016-04-01 – 2020-03-31
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| キーワード | Hydrogen Storage / Metal Hydrides |
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| 研究実績の概要 |
Mg4NiPd and Mg4NiSn were prepared by ingot casting. Since the as-cast materials contained several phases, the materials were homogenized at the atomic scale using the high-pressure torsion (HPT) method (the HPT facility was fabricated using this grant and installed at Kyushu University). The crystal structure of Mg4NiPd and Mg4NiSn transformed to new phases after HPT processing, but large strains were required to achieve single phase alloys with high level of atomic-scale mixing. Preliminary examinations by pressure-composition isotherms confirmed that both Mg4NiPd and Mg4NiSn can store hydrogen below 373 K.
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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 has good progress because we could synthesize new Mg-Ni-Pd and Mg-Ni-Sn phase whic can store the hydrogen below 373 K. However, since most of this fiscal year was a spent to design and make a high-pressure torsion facility, we couldn't achieve the final target of our project. Moreover, detailed characterizations should be still conducted to verify the structural and microstructural features. The theoretical studies have been started, but we need more time to reach a clear conclusion based on the theoretical studies.
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| 今後の研究の推進方策 |
Ingots of Mg4NiPd (prepared by plasma melting) are processed by high-prssure torsion to make single-phase materials. Moreover, powder mixtures of Mg are mixed with V and a third elemental additive such as Cr using the high-pressure torsion to produce solid solution bcc alloys. Hydrogen storage properties of these materials are investigated using the hydrogen pressure-temperature isotherms in a gas absorption facility. The formation of new phases before and after hydrogenation test are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS) and atom probe tomography (APT). In situ XRD analysis combined with Rietveld refinement during heating and hydrogenation are conducted to examine the stability of new phases and the binding energy of hydrogen in this new materials. The preliminary results on the potential of the high-pressure torsion to synthesize new Mg-based materials will be summarized in the form of a paper.
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