| Project/Area Number |
16K04900
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nanomaterials engineering
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| Research Institution | Ehime University |
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Principal Investigator |
YAMAMURO SAEKI 愛媛大学, 理工学研究科(工学系), 准教授 (10402653)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | ナノコンポジット / スピネルフェライト / 共析反応 / 固相プロセス / 液相プロセス / 磁性材料 / 粉末 / ナノ粒子 / 酸化鉄 / 磁性 / ナノ材料 |
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| Outline of Final Research Achievements |
By employing the eutectoid decomposition of FeO, we have fabricated ferrite-based magnetic nanocomposites consisting of a lamellar nanostructure of a ferromagnetic metal (Fe) and a ferrimagnetic spinel ferrite (Fe3O4). It was found that the room-temperature magnetization measurements for nanocomposite powders prepared by a solid-phase process gave rise to a high saturation magnetization above 100 emu/g, which is larger than that of single-phase Fe3O4. Such high magnetization is ascribed to the presence of the Fe phase, which has a large saturation magnetization. A smooth magnetization curve with single-phase-like behavior was observed for nanocomposite specimens despite the coexistence of two magnetic phases, suggesting that the two phases could be magnetically exchange-coupled. The addition of cobalt resulted in an enhanced coercivity, indicating the formation of cobalt ferrite with a high magnetocrystalline anisotropy.
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| Academic Significance and Societal Importance of the Research Achievements |
FeOの共析分解により得られたFeとスピネルフェライトからなるラメラ複合組織が、ナノコンポジット磁石として機能する可能性について示した。特にCo添加の結果からは、構成酸化物相であるスピネルフェライト相を自在に置き換えることができる可能性を示すことができた。スピネルフェライトは構成金属イオンを別種の金属イオンで置換することにより磁気特性を多彩に制御できることから、各種スピネルフェライトとFeからなるナノコンポジット作製の新たな手法を提示することができた。
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