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High-coercivity samarium-iron-nitrogen from nitriding melt-spun ribbons

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Abstract

Melt spinning has proven to be an excellent technique for magnetic hardening of a variety of permanent magnet materials, especially Nd-Fe-B. Recently, a new permanent magnet material has been discovered by nitriding the compound Sm2Fe17 to obtain Sm2Fe17Nx. The authors have obtained magnetically hard Sm-Fe-N ribbons with a room-temperature intrinsic coercivityH ci = 22 kOe (1.8 MA/m) by nitriding melt-spun Sm-Fe precursor ribbons. Best results were obtained by grinding the ribbons to a <25 µm powder, then heat treating the powder in vacuum for 1 h at 700 °C prior to nitriding in N2 gas at 450 to 480 °C. X-ray diffraction shows that the primary phase is TbCu7-type Sn2Fe17Nx, a disordered hexagonal modification of the rhombohedral Snu2Fe17 phase.

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Authors and Affiliations

  1. Physics Department, General Motors NAO Research and Development Center, Warren, Michigan

    F. E. Pinkerton & C. D. Fuerst

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  1. F. E. Pinkerton
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  2. C. D. Fuerst
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Pinkerton, F.E., Fuerst, C.D. High-coercivity samarium-iron-nitrogen from nitriding melt-spun ribbons. JMEP 2, 219–223 (1993). https://doi.org/10.1007/BF02660289

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