Effect of lattice distortion induced by Ce chemical valence on coercivity of Nd-Ce-Fe-B alloy

Yang, Manman; Luo, Sangen; Rehman, Sajjad Ur; Liu, Chao; Li, Jiajie; Yu, Xiaoqiang; Long-gui, LI

doi:10.1016/j.jallcom.2021.162486

Cited by 12 publications

(1 citation statement)

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“…The binding energy ranges corresponding to the sites of the Ce 3+ and Ce 4+ peaks were identified according to references. [ 31 , 32 , 42 , 43 ] The high‐resolution spectra of the Ce 3d photoelectron peak fitting results showed that the Ce 3+ and Ce 4+ ions coexisted in all samples (Figure 3a ). To estimate the variations in the ratios of the Ce 3+ ions with increasing La substitution, the proportion of trivalent and tetravalent peak areas in Ce 3d 5/2 and Ce 3d 3/2 was calculated, as shown in Figure 3b .…”

Section: Resultsmentioning

confidence: 99%

Strategy for Co‐Enhancement of Remanence–Coercivity of RE‐Fe‐B Sintered Magnets with High Ce‐Content: Appropriate La Substitution

Chen

Zhang

et al. 2023

Advanced Science

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The development of low-cost RE-Fe-B sintered magnets with large La/Ce content is of great significance for the balanced utilization of rare earth (RE) resources, but it is limited by reduced magnetic properties. In this work, the coercivity (H cj ), remanence (B r ), maximum energy product [(BH) max ], and temperature stability are simultaneously enhanced for magnets with LaCe accounting for 40 wt% of the total RE. The synergistic regulation of the REFe 2 phase, Ce-valence, and grain boundaries (GBs) in RE-Fe-B sintered magnets is realized for the first time by introducing appropriate La elements. The La elements inhibit the generation of the REFe 2 phase and tend to stay in the triple junctions, promoting the segregation of the RE/Cu/Ga elements and contributing to the formation of Ce/Nd/Cu/Ga-rich continuous thicker lamellar GBs, and as a result, weakening the detrimental effect on HA caused by La element substitution and enhancing H cj . In addition, partial La atoms entering the RE 2 Fe 14 B phase are beneficial for improving the B r and temperature stability of the magnets and promoting the Ce 3+ ion ratio, which also provides additional benefit for B r . The findings provide an effective and feasible way to co-enhance the remanence and coercivity of RE-Fe-B sintered magnets with high Ce content.

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Section: Resultsmentioning

confidence: 99%