Maximizing the hard magnetic properties of melt-spun Ce–La–Fe–B alloys

Understanding the Role of Element Grain Boundary Diffusion Mechanism in Nd–Fe–B Magnets

“…Figure 1b shows that, using (Tb 52.5 Ce 100− x La x ) 17.5 Cu 30 ( x = 20, 40, 60, 80, and 100 at%) as diffusion sources, the H cj of the diffused magnet first increases with La content, reaching a maximum value of 1842 kA m −1 at x = 60, and then decreases. Although the partial substitution of Ce by La can enhance the anisotropy constant K of Ce 2 Fe 14 B, [ 37 ] in this work, the increase of H cj is thought to be related to the change in the diffusion behavior of RE elements. The evolution of the loop squareness is analogous to that of coercivity.…”

“…As Tb 2 Fe 14 B has a Curie temperature ( T c ) of 620 K higher than that of Nd 2 Fe 14 B (586 K), [ 25 ] the thermal demagnetization of TbCu occurs at a higher temperature. The low phase transition temperature of TbCeCu also indicates the formation of Ce‐containing main phase since the T c of Ce 2 Fe 14 B is 420 K. [ 37 ] In contrast, TbCeLaCu has an even higher T c than TbCu, although the T c of Ce 2 Fe 14 B and La 2 Fe 14 B are both lower than that of Nd 2 Fe 14 B. [ 37 ] Combined with the results in Figure 1d, it is believed that in comparison to the TbCu magnet, more Tb enter into the 2:14:1 phase in the TbCeLaCu magnet.…”

Phase Formation and Magnetic Properties of La‐ and Ce‐Substituted (Nd1−2xRExPrx)2.28Fe13.58B1.14 Melt‐Spun Ribbons

“…The reason for it could be that the microstructure uniformity of the ribbon could be formed due to the addition of La, resulting in the improvement of the magnetic performance of the ribbon. [24] In contrast, the B r and (BH) max of Ce 5 Pr 5 and Ce 10 Pr 10 ribbons deteriorate gradually with increasing Ce-Pr substitution. However, the H cj of Ce 10 Pr 10 ribbon is higher than that of Ce 5 Pr 5 ribbon, which would result from the fact that the magnetocrystalline anisotropy field of Pr 2 Fe 14 B phase is higher than those of Ce 2 Fe 14 B and Nd 2 Fe 14 B phases.…”

“…Recently, the magnetic performances of Ce-and La-substituted Nd-Fe-B alloys were investigated. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Lei et al, [6] Zhang et al [7] and Rehman et al [8,9] studied the phase composition, microstructure, and magnetic properties of Nd-Fe-B and Ce-Fe-B melt-spun ribbons with different doping metals such as La, Ta, and Ge. Zhu et al [10] reported that (Nd 1Àx Ce x ) 30 Fe bal B magnets prepared by the double main-phase alloy method show good magnetic properties.…”

Accelerated discovery of cost-effective Nd–Fe–B magnets through adaptive learning

“…2 As a result, doping of La/ Ce invariably leads to degraded magnetic properties, especially at HT. [22][23][24][25][26][27][28][29] Co, with a very high T C , could signicantly improve the temperature stability and therefore benet HT magnetic properties, although it results in loss of RT magnetic properties as well. 21,[30][31][32][33] In recent years, investigation of Y as a promising doping species for Nd-Fe-B has picked up momentum.…”