Fig. 1. (a) The room-temperature demagnetization curves of the [(Pr, Nd)_{1 – x}MM_x]_13.8 Fe_balM_1.5B_5.9 (x = 0.0, 0.5, 0.7, and 1.0) magnets. (b) XRD patterns of the sintered magnet prepared by SMP or DMP process.

Fig. 2. The comparison of (BH)_max for MM based RE–Fe–B sintered magnets. The solid and hollow symbols are corresponding to SMP and DMP processes, respectively.

Fig. 3. Temperature dependence of σ_m and d σ_m / d T in the range of 300–700 K for [(Pr, Nd)_{1 – x}MM_x]_13.8Fe_balM_1.5B_5.9 (x = 0.5 and 0.7) magnets prepared by DMP process.

Fig. 4. The back-scattered images of [(Pr, Nd)_{1 – x}MM_x]_13.8Fe_balM_1.5B_5.9 magnets: (a) x = 0.5 with SMP, (b) x = 0.5 with DMP, (c) x = 0.7 with SMP, and (d) x = 0.7 with DMP process.

Fig. 5. (a) Back-scattered electron image and (b)–(f) the corresponding EDX mappings of La, Ce, Fe, Pr, and Nd for [(Pr, Nd)_0.3MM_0.7]_13.8Fe_balM_1.5B_5.9 magnets with SMP process.

Fig. 6. (a) Back-scattered electron image and (b)–(f) the corresponding EPMA mappings of La, Ce, Fe, Pr, and Nd for [(Pr, Nd)_0.3MM_0.7]_13.8Fe_balM_1.5B_5.9 DMP magnets.

Fig. 7. The dependence of M, M_r, and H_cj of minor loops of [(Pr, Nd)_{1 – x}MM_x]_13.8Fe_balM_1.5B_5.9 magnets on H/H_cj for (a) x = 0.5 and (b) x = 0.7, the insets show the minor loops.

Fig. 8. The recoil loops for [(Pr, Nd)_{1 – x}MM_x]_13.8Fe_balM_1.5B_5.9 (x = 0.5 and 0.7) magnets with SMP and DMP processes, respectively.

Fig. 9. (a) The recoil loops for [(Pr, Nd)_0.5MM_0.5]_13.8Fe_balM_1.5B_5.9 DMP magnets, (b) the dependence of χ_rev/σ_s on the applied magnetic field H deduced from the recoil loops for [(Pr, Nd)_{1 – x}MM_x]_13.8Fe_balM_1.5B_5.9 (x = 0.5 and 0.7) magnets with SMP and DMP processes, respectively.