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Structural Characteristics and Rapid Solidification of Nd2Fe14B-Type Permanent Magnet Materials

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Supermagnets, Hard Magnetic Materials

Part of the book series: NATO ASI Series ((ASIC,volume 331))

Abstract

A new era in permanent magnet technology has been initiated by the development of rare earth-iron-boron materials, whose prototypical representative is Nd2Fe14B. This paper describes the structural properties of Nd2Fe14B and the preparation of practical magnets based on it and isostructural compounds via the rapid solidification technique of melt spinning. Although characterized by tetragonal lattice symmetry, Nd2Fe14B is crystallographically related to many other rare earth-transition metal systems, including those having the hexagonal CaCu5 structure (e.g., SmCo5) and the rhombohedral Th2Zn17 structure (e.g., Sm2Co17 and Nd2Fe17). Similarities between Nd2Fe14B and simpler, transition metal-metalloid systems such as FeB are also afforded by the trigonal prisms formed by each boron and its six nearest-neighbor iron atoms. A genuine departure from traditional sintering methods, melt spinning has emerged as a commercially viable means for producing magnets principally comprised of Nd2Fe14B-type compounds.

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  1. Physics Department, General Motors Research Laboratories, Warren, MI, 48090-9055, USA

    J. F. Herbst

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  1. Department of Chemistry, University of Missouri-Rolla, Rolla, USA

    Gary J. Long

  2. Institute of Physics, University of Liège, Sart-Tilman, Belgium

    Fernande Grandjean

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Herbst, J.F. (1991). Structural Characteristics and Rapid Solidification of Nd2Fe14B-Type Permanent Magnet Materials. In: Long, G.J., Grandjean, F. (eds) Supermagnets, Hard Magnetic Materials. NATO ASI Series, vol 331. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3324-1_5

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  • DOI: https://doi.org/10.1007/978-94-011-3324-1_5

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