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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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Keywords | 強磁場 / 平衡状態図 / 磁場中合成 / 強磁性体 / 磁場効果 / 状態図 / 金属物性 / 結晶成長 / 磁性 / 反応・分離工学 |
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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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| 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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Report
(5 results)
Research Products
(51 results)
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[Presentation] Magnetic field effect on phase stability of L10-MnAl2019
Author(s)
Ryota Kobayashi, Yoshifuru Mitsui, Katsunari Oikawa, Reisho Onodera, Rie Umetsu, Kohki Takahashi and Keiichi Koyama
Organizer
Joint 5th Int’l Symposium on Frontiers in Materials Science and 3rd Int’l Symposium on Nano-materials, Technology and Applications
Related Report
Int'l Joint Research
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[Presentation] MnBi形態の磁場効果2016
Author(s)
高木観雄, 三井好古, 宮﨑泰樹, 梅津理恵, 高橋弘紀, 小山佳一
Organizer
日本磁気科学会
Place of Presentation
物質材料研究機構、茨城県、つくば市
Year and Date
2016-11-15
Related Report
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[Presentation] Magnetic Field-Induced L10-Ferromagnetic MnAl2016
Author(s)
R. Kobayashi, Y. Mitsui, R. Y. Umetsu, K. Takahashi, M. Mizuguchi, K. Koyama
Organizer
The 4th International Conference of Asian Union of Magnetics Societies (IcAUMS 2016)
Place of Presentation
台南市、台湾
Year and Date
2016-08-01
Related Report
Int'l Joint Research
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