| Project/Area Number |
12555173
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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 | 展開研究 |
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| Research Field |
Physical properties of metals
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| Research Institution | Miyagi National College of Technology |
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Principal Investigator |
MATSUURA Makoto Miyagi National College of Technology, Science and Mathematics, Professor, 総合科学系・理数科, 教授 (40042262)
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| Co-Investigator(Kenkyū-buntansha) |
KONNO Kazuya Miyagi National College of Technology, Science and Mathematics, Assistant Professor, 総合科学系・理数科, 助教授 (80270198)
SUZUKI Katsuhiko Miyagi National College of Technology, Science and Mathematics, Professor, 総合科学系・理数科, 教授 (80187715)
IKUTA Nobuyuki Miyagi National College of Technology, Science and Mathematics, Professor, 総合科学系・理数科, 教授 (50042255)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2000: ¥8,600,000 (Direct Cost: ¥8,600,000)
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| Keywords | Nd_2Fe_<14>B / HDDR / XAFS / micro alloying / Hydrogen / Zr / Ga / Ga添加効果 / 微量添加元素 / 水素処理 / HDDR / 微量添加物 / 水素 |
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| Research Abstract |
The main aim of this study is to elucidate the role of small additives on the enhancement of magnetic anisotropy of Nd_2Fe_<14>B based magnets during Hydrogenation, Disproportionation, Desorption and Recombination (HDDR) process.
The following results are obtained through this researching project.
1) Nb in Nd_<12.5>Fe_<bal>Ga_<0.3>Nb_<0.2>B_<6.2> forms FeNbB compound in the as-cast state and it is stable through HDDR process.
2) Ga in Nd_<12.5>Fe_<bal>Ga_<0.3>Nb_<0.2>B_<6.2> preferentially occupies Fe(4c) site at the homogenized state and transfers to bcc Fe at the disproportionated state.
3) At the beginning of recombination stage, Nd_2Fe_<14>B forms preferentially at the place where Ga is included.
4) From this result we can infer that Ga is included in bcc Fe near the grain boundary region and the recombination of Nd_2Fe_<14>B start from the grain boundary where Ga is included.
5) Zr in homogenized Nd_<12.5>Fe_<bal>Zr_<0.5>B_6, which is prepared by arc melting forms ZrB and this ZrB compound is stable through HDDR process.
6) Site preference of Zr in a melt-quenched Nd_<12.5>Fe_<bal>Zr_<0.5>B_6 ribbon differs from the sample prepared by arc melting ; Zr in melt-quenched Nd_<12.5>Fe_<bal>Zr_<0.5>B_6 occupies Nd(4f) site rather than Zr site in ZrB for the sample prepared by arc melting.
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