The Effect of Co on HDDR Phenomena in the Sm3(Fe, V)29 Compound

David Book; Ken-ichi Kato; Hajime Nakamura; Satoshi Sugimoto; Toshio Kagotani; Masuo Okada; Motofumi Homma

doi:10.3379/jmsjmag.23.314

Chapter 4. Hard Magnets

The Effect of Co on HDDR Phenomena in the Sm₃(Fe, V)₂₉ Compound

David Book, Ken-ichi Kato, Hajime Nakamura, Satoshi Sugimoto, Toshio Kagotani, Masuo Okada, Motofumi Homma

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Keywords: HDDR, 3:29 phase, permanent magnets, disproportionation, TbCu₇ type phase

JOURNAL OPEN ACCESS

1999 Volume 23 Issue 1_2 Pages 314-316

DOI https://doi.org/10.3379/jmsjmag.23.314

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Abstract

The addition of cobalt was found to increase the disproportionation temperature and decrease the recombination temperature of Sm₃(Fe, V)₂₉. TEM of disproportionated samples showed rod-like SmH₂ phase ≈5 nm in diameter in anαFe(Co, V) matrix, and features of about 50 to 100 nm in size were found in a 30% Co sample recombined at 630°C for 1 hour. In addition to αFe(Co, V) and TbCu₇ type phases, XRD also showed the presence of an unidentified phase that forms at high Co contents and low recombination treatment temperatures, which appeared to have an adverse effect on the magnetic properties, after nitriding.

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