Crystallization and magnetic properties of amorphous NdxB19-xFe81 (0⩽x⩽19) alloys

Nanocrystalline and nanocomposite permanent magnets by melt spinning technique

“…Gu et al studied the crystallization and magnetic properties of amorphous Nd x Fe 81 B 19−x alloys systematically. [41] Table 3 summarizes the phase components in the annealed ribbons from amorphous alloys, which are confirmed by the nuclear magnetic resonance (NMR) and Mossbauer effect reported by Cheng et al [42] As one can see that the amorphouscrystalline transition occurs at temperature as low as 600 • C. The crystalline phases vary with both annealing temperature and materials composition, while the ribbons have multiple phases in most cases. A single-phase Nd 2 F 14 B magnet with the highest coercivity was obtained by a 800 • C annealing of the Nd 12 Fe 81 B 7 ribbon, which is close to the stoichiometric composition of the 2:14:1 phase.…”

“…Therefore, both annealing temperature and time should be carefully controlled in order to obtain magnetically hard Nd 2 Fe 14 B phase. [41] X 600 Table 4. Crystalline phases in Nd 4.5 Fe 77 B 18.5 during isothermal annealing.…”

Influence of Si substitution on phase components and magnetic properties of crystallized Nd4Fe77.5B18.5 alloys

“…This magnet is of commercial interest because the costly magnetic alignment step is not required to obtain maximum performance and the alloys require less of the expensive rare earth element. In previous work [8][9][10][11] we have studied the structure and magnetic properties of NdFeB alloys with low Nd content and the effect of substitution of elements. It is found that as-quenched NdFeB alloys with low Nd concentration are in the amorphous state.…”