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

Abstract

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.

Relationships between crystal structure and magnetic properties inNd2Fe14<

“…Finally, we emphasize two points. First, the R2Fe14B phase forms with R = Ce, Pr, Sm, Gd, Tb, Dy, Ho, and Er in addition to Nd, 2 …”

Nanocrystalline and Nanostructured High-Performance Permanent Magnets

“…In fact, the parameter . 2 Kpi, which is a measure for the strength of the domain wall pinning centers amounts to 0.1 -0.4 for fully heat treated samples depending on the aging conditions ( figure 12 (left)) and for the parameter o¢,pi. the typical l/cos i/, behaviour with increasing '/, is found, i.e.…”

Recycling of Sintered Nd-Fe-B Magnets Doped with PrNd Nanoparticles

“…Sintered Nd-Fe-B permanent magnets have been widely used due to their excellent magnetic properties [1][2][3]. The increasing demand has resulted in the enormous production of Nd-Fe-B magnets.…”