2019 Fiscal Year Final Research Report
The study on equilibrium phase diagram under magnetic fields and preparation of ferromagnetic materials by magnetic field-induced reaction effects
| Project/Area Number |
16H04547
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Metal making/Resorce production engineering
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| Research Institution | Kagoshima University |
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Principal Investigator |
KOYAMA Keiichi 鹿児島大学, 理工学域理学系, 教授 (70302205)
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| Co-Investigator(Kenkyū-buntansha) |
三井 好古 鹿児島大学, 理工学域理学系, 准教授 (90649782)
伊藤 昌和 鹿児島大学, 総合科学域総合教育学系, 准教授 (40294524)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Keywords | 強磁場 / 平衡状態図 / 磁場中合成 / 強磁性体 |
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| Outline of Final Research Achievements |
We evaluated equilibrium phase diagrams in high magnetic fields and obtained the following main results regarding the magnetic filed-induced chemical reaction effect (MFE). (1) We have developed a heat treatment quenching furnace in a magnetic fields up to 19T (the world's highest magnetic field). (2) The origin of the MFE for MnBi is mainly due to the enhancement of the MnBi-phase formation rate. (3) It was suggested that magnetic separation of MnBi is possible even at about 0.5 T by using the magnetic field gradient. (4) The origin of the field-induced nonmagnetic-ferromagnetic phase transformation in MnAl is due to the promotion of the nonmagnetic epsilon phase-ferromagnetic tau phase transformation and the suppression of the nonmagnetic beta phase transformation. (5) We found that the epsilon phase was stabilized by C in MnAl. (6) An efficient tau phase magnetic field synthesis method was developed using MnAlZn. (7) Field suppressing effect of crystal size was found with MnCuAl.
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| Free Research Field |
磁気物理学、強磁場材料科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で、機能性磁性材料５種類の磁場効果を解明し、３件の磁場効果の起源を突き止めた。世界最高磁場中強磁性物質合成に成功した。磁場中平衡状態図の計算法の開発が進み、効率的に磁場中材料開発が可能になった。助成期間に９編の査読付き論文発表、3度の国際会議招待講演成果公表、４件の関連特許出願、2017年1月には南日本新聞誌上で研究成果が報道発表されるなど、本研究の学術的意義と社会的意義は高いことを示した。
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