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Article Dans Une Revue Materials Today Nano Année : 2022

Cu-mediated grain boundary engineering in Nd–Ce–Fe–B nanostructured permanent magnets

Y.M. Tao
  • Fonction : Auteur
J.Y. Jin
  • Fonction : Auteur
C. Wu
  • Fonction : Auteur
K. Lv
  • Fonction : Auteur
B. Xin
  • Fonction : Auteur
M. Yan
  • Fonction : Auteur


Grain boundary (GB) engineering is of general significance for developing high-performance permanent magnets (PMs), but remains largely lacking in Nd–Ce–Fe–B nanostructured PMs containing the novel REFe2 (1:2, RE = rare earth) phase, previously considered as a coercivity-damaging agglomerated paramagnetic precipitate. Here we present a Cu-mediated GB engineering strategy that delicately controls the composition, distribution and magnetism of the 1:2 phase in (Nd0.5Ce0.5)30.5Fe68.5-xCuxB1.0 nanostructured magnets (x = 0–0.5). Experimental studies show that the incorporated Cu enables the formation of a continuous 1:2 GB phase, which is reported for the first time in Nd–Ce–Fe–B nanostructured magnets. More interestingly, the Cu infiltration into the 1:2 phase also permits more Nd to replace Ce, generating a novel Nd-dominated 1:2 phase with a ferro-paramagnetic transformation. A certain fraction of the 1:2 phase with ferromagnetic nature results in an obvious kink near −35 kA/m reversal field at 300 K, which disappears after the ferro-paramagnetic transition at 350 K. At optimal Cu doping (x = 0.2) with a maximized coercivity of 992 kA/m, the paramagnetic and ferromagnetic 1:2 phases coexist with highest total fraction of 4.8 wt%, revealing an advantageous role of paramagnetic 1:2 GB phase in enhancing coercivity. Our exploration paves a novel Cu-mediated approach for rational engineering of the 1:2 GB phase, which may exert far-reaching significance for developing low-cost Nd–Ce–Fe–B PMs.
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Dates et versions

hal-04099045 , version 1 (16-05-2023)



Y.M. Tao, J.Y. Jin, L.Z. Zhao, X.L. Liu, Z.H. Zhang, et al.. Cu-mediated grain boundary engineering in Nd–Ce–Fe–B nanostructured permanent magnets. Materials Today Nano, 2022, 19, pp.100230. ⟨10.1016/j.mtnano.2022.100230⟩. ⟨hal-04099045⟩
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