Structure of Nd_2Fe_<14>B/Fe Resulting from Reaction of Nd_2Fe_<17> and B

概要

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A novel method to prepare anisotropic composite magnetic material was described. A block of Nd_2Fe_<17> compound was heated with the surrounding B (or B_2O_3) powder and the reaction accelerator Ca. In the reaction region, rod-shaped Fe precipitates were formed inside Nd_2Fe_<14>B matrix grains. The longitudinal directions of those are parallel to the B diffusion path, while perpendicular to the c-axis of Nd_2Fe_<14>B crystals. The Fe diameter depends on the heating temperature, below 100nm at 1123K. This structure is regarded as eutectic, and differ from that formed by peritectic solidification. The similar reaction product was formed in the powder from by using Nd_2Fe_<17> powder instead of the bulk material. That product has larger magnetization than Nd_2Fe_<14>B, but has no coercivity and the small anisotropy field about 1.6MA/m.
社団法人日本磁気学会の論文
1999-01-20