| 研究課題/領域番号 |
19K15391
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| 研究機関 | 京都大学 |
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研究代表者 |
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| 研究期間 (年度) |
2019-04-01 – 2022-03-31
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| キーワード | SmFe12 / Rare Earth / Transition Metal / Hydride / Permanent Magnets |
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| 研究実績の概要 |
A bottom-up approach for the preparation of the Sm(Fe1-xCox)12-yTiy (ThMn12, I4mmm) particles composed of the controllable chemical synthesis and reduction-diffusion process has been developed, opening horizons for optimization of the microstructure and enhancement of the magnetic performance of the materials.
Structure and magnetic properties of the materials have been elucidated using a wide range of techniques: partial substitution of Fe with Co and Ti has stabilized the highly tetragonal lattice in bulk and resulted in large saturation magnetization, large anisotropy files, and high Curie temperature; hydrogen interstitial doping has strongly stabilized the easy c-axis anisotropy and significantly enhanced the anisotropy field and Curie temperature of the materials.
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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 research progress well regards the research objective and implemented plan in 2019, as follows:
(1) A efficient methodology for the preparation of Sm(Fe1-xCox)12-yTiy (ThMn12, I4/mmm) particles has been established and
(2) Structure and magnetic properties of the materials have been characterized and analyzed in details.
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| 今後の研究の推進方策 |
The research is planned as follows:
(1) Controlling the microstructure of the materials: particle size in a range of D = 100-1000 nm and further optimization of their stoichiometry,
(2) Fabrication of the easy-axis aligned Sm(Fe1-xCox)12-yTiy bulk nanostructured permanent magnets by green compacting, bonding, or sintering processes under apply fields for green magnets or sintered magnets, respectively, and
(3) Elucidating and understanding the microstructure and magnetic properties of the Sm(Fe1-xCox)12-yTiy nanopowders and the bulk nanostructured permanent magnets.
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| 次年度使用額が生じた理由 |
Some academic conferences and research workshops have been cancelled due to the novel coronavirus (COVID-19) outbreak.
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