Microstructure analysis of Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption

N. Watanabe; H. Umemoto; M. Ishimaru; M. Itakura; M. Nishida; K. MacHida

doi:10.1111/j.1365-2818.2009.03231.x

Microstructure analysis of Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption

N. Watanabe, H. Umemoto, M. Ishimaru, M. Itakura, M. Nishida, K. MacHida

Materials Physics and Engineering

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

Behaviours of constituent elements in the Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption have been investigated by using an analytical transmission microscopy. It was found that a triple junction of the grain boundaries consists of fine Nd-O crystalline and amorphous phase. The energy dispersive X-ray spectroscopy (EDS) analysis showed that the amorphous phase mainly consists of Co, Nd and Tb. The Tb-treatment causes the formation of the amorphous Co-Nd(Tb) wetting-layer phase which wraps each Nd₂Fe ₁₄B grain. The results suggest that the wrapped structure prevents the nucleation of magnetic reversed domains and then improves significantly the coercivity of the magnet.

Original language	English
Pages (from-to)	104-108
Number of pages	5
Journal	Journal of Microscopy
Volume	236
Issue number	2
DOIs	https://doi.org/10.1111/j.1365-2818.2009.03231.x
Publication status	Published - Nov 2009

All Science Journal Classification (ASJC) codes

Pathology and Forensic Medicine
Histology

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10.1111/j.1365-2818.2009.03231.x

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abstract = "Behaviours of constituent elements in the Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption have been investigated by using an analytical transmission microscopy. It was found that a triple junction of the grain boundaries consists of fine Nd-O crystalline and amorphous phase. The energy dispersive X-ray spectroscopy (EDS) analysis showed that the amorphous phase mainly consists of Co, Nd and Tb. The Tb-treatment causes the formation of the amorphous Co-Nd(Tb) wetting-layer phase which wraps each Nd2Fe 14B grain. The results suggest that the wrapped structure prevents the nucleation of magnetic reversed domains and then improves significantly the coercivity of the magnet.",

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AU - Watanabe, N.

AU - Umemoto, H.

AU - Ishimaru, M.

AU - Itakura, M.

AU - Nishida, M.

AU - MacHida, K.

PY - 2009/11

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AB - Behaviours of constituent elements in the Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption have been investigated by using an analytical transmission microscopy. It was found that a triple junction of the grain boundaries consists of fine Nd-O crystalline and amorphous phase. The energy dispersive X-ray spectroscopy (EDS) analysis showed that the amorphous phase mainly consists of Co, Nd and Tb. The Tb-treatment causes the formation of the amorphous Co-Nd(Tb) wetting-layer phase which wraps each Nd2Fe 14B grain. The results suggest that the wrapped structure prevents the nucleation of magnetic reversed domains and then improves significantly the coercivity of the magnet.

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Microstructure analysis of Nd-Fe-B sintered magnets improved by Tb-metal vapour sorption

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