2022 Fiscal Year Final Research Report
The reason why the coercivity of the magnet material Sm2Fe17N3 is too low
Project/Area Number |
20K05071
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 26010:Metallic material properties-related
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Research Institution | National Institute of Advanced Industrial Science and Technology |
Principal Investigator |
Yamaguchi Wataru 国立研究開発法人産業技術総合研究所, 材料・化学領域, 主任研究員 (30292775)
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Project Period (FY) |
2020-04-01 – 2023-03-31
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Keywords | 保磁力 / 磁気異方性 / 結晶場 / コーティング |
Outline of Final Research Achievements |
It was assumed that the uniaxial anisotropy was lost on the particle surface of Sm2Fe17N3 and the magnetization reversal was facilitated. The reason for this is that the crystal continuity is cut off on the surface, and the crystal field at the Sm site located on the surface is completely different from that inside the crystal. Based on this hypothesis, we designed a substance "Crystal Field Restoration Material" that restores the crystal field on the surface and brings it closer to that of the interior. While predicting the effect by first-principles calculation, we actually coated oxide-free Sm2Fe17N3 powder with the material to verify the effect on coercivity. As a result, an increase in coercivity of more than 40% was confirmed. On the other hand, the fact that the remanence hardly decreases suggests that the coating phase acts electronically without eroding the main phase.
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Free Research Field |
金属材料物性
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Academic Significance and Societal Importance of the Research Achievements |
Sm2Fe17N3はポストネオジム磁石候補として期待されてきたが、高い潜在力に比して保磁力が低いことが問題であった。本研究はその原因を解明し潜在力を引き出すことを目指し実施された。その結果、粉末表面を独自の方法で修飾することにより、残留磁化を損なうことなく保磁力を大幅に向上させることに成功した。内燃機関からモーターへの置き換えが進む輸送機器分野を中心に、次世代磁石を提供する成果として期待される。
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