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논문 기본 정보

자료유형
학술저널
저자정보
H. W. Kwon (Pukyong National University) J. H. Yu (Korea Institute of Materials Science)
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.17 No.3
발행연도
2012.9
수록면
185 - 189 (5page)

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The coercivity of near single domain size Nd<SUB>2</SUB>Fe<SUB>14</SUB>B-type particles prepared by ball milling of HDDR-treated Nd<SUB>12.5</SUB>Fe<SUB>80.6</SUB>B<SUB>6.4</SUB>Ga<SUB>0.3</SUB>Nb<SUB>0.2</SUB> alloy was investigated. The feasibility of a surface nitrogenation for improving the coercivity stability of the fine Nd<SUB>2</SUB>Fe<SUB>14</SUB>B-type particles was also studied. The near single domain size Nd<SUB>2</SUB>Fe<SUB>14</SUB>Btype particles had a high coercivity of over 9 kOe. However, the coercivity radically deteriorated as the temperature increased in air (< 2 kOe at 200°C). This coercivity reduction was attributed to the soft magnetic phases, α-Fe and Fe<SUB>3</SUB>B, which formed on the surface of the fine particle due to oxidation. Surface nitrogenation of the fine particles significantly improved the stability of their coercivity. The improvement in coercivity stability was attributed to the formation of a thin nitrogenated layer on the surface of the fine Nd<SUB>2</SUB>Fe<SUB>14</SUB>B-type particles, which enhanced the anisotropy field and gave improved resistance to oxidation (dissociation).

목차

1. Introduction
2. Experimental Work
3. Results and Discussion
4. Conclusion
Acknowledgement
References

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