High Resolution Electron Microscopy of Grain Boundaries in Sintered Fe₇₇Nd₁₅B₈ Permanent Magnets

• Kenji Hiraga

• Makoto Hirabayashi

• Masato Sagawa

• Yutaka Matsuura

抄録

Grain boundaries of sintered Fe 77 Nd 15 B 8 permanent magnets with different heat-treatments have been examined by high resolution electron microcopy. A b.c.c. phase with the lattice constant of a=0.29 nm was found at most of the boundaries of Fe 14 Nd 2 B grains. The b.c.c. phase and Fe 14 Nd 2 B grains are joined with smooth interfaces in the samples annealed at 870 K, which have a coercivity as high as 1000 KA/m. In samples quenched from 1350 K with a coercivity of about 500 KA/m, however, thin plates of the b.c.c. phase extend from the interfaces to the inside of the Fe 14 Nd 2 B grains, and deform the lattice spacings of (001) planes of the Fe 14 Nd 2 B matrix. These thin plates are considered to act as nucleation centers of reverse magnetic domains which reduce the coercivity of the specimen.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 24 (1A), L30-, 1985-01-01

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360566396791847808
• NII論文ID: 110003929628
• NII論文ID: 210000024163
• NII書誌ID: AA10650595
• DOI: 10.1143/jjap.24.l30
• ISSN: 13474065
• ISSN: 00214922
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.24.L30
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.24.L30/pdf
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