Pr-Fe and Nd-Fe-based materials: A new class of high-performance permanent magnets (invited)

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  • J. J. Croat
    Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055
  • J. F. Herbst
    Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055
  • R. W. Lee
    Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055
  • F. E. Pinkerton
    Physics Department, General Motors Research Laboratories, Warren, Michigan 48090-9055

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<jats:p>We report the properties of a new class of high-performance permanent magnets prepared from Nd-Fe-B and Pr-Fe-B alloys. Magnetic hardening is achieved by rapid solidification. Energy products of these isotropic materials can exceed 14 MGOe with intrinsic coercivities of ∼15 kOe. X-ray and microstructural analyses indicate that the alloys exhibiting optimum characteristics are comprised of roughly spherical crystallites, strongly suggesting that the coercivity mechanism is of the single-domain particle type. The crystallites are composed of an equilibrium R-Fe-B intermetallic phase having tetragonal symmetry, and the stability of this phase with respect to other rare earths and other metalloids has been investigated.</jats:p>

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