Abstract
Sm −xFe 7+x(0 ⩽ × ⩽ 0.9) alloys were induction-melted and rapidly quenched at various wheel velocities of 20–50 m/s. The results of X-ray diffraction show that for the composition of 0 ⩽ × ⩽0.1 the rhombohedral Th 2Zn 17-type structure is the main phase, and for the composition of 0.2 ⩽ × ⩽0.9 the hexagonal TbCu 7-type structure is formed. AC initial susceptibility experiments indicate that at annealing temperatures below 580°C the amorphous phase is crystallized to the TbCu 7-type phase, while annealing up to 800°C the TbCu 7-type phase is transformed to the Th 2Zn 17phase. After nitrogenation, the optimal condition for the best magnetic properties is obtained in Sm 12.5Fe 87.5N γ quenched at 50 m;'s and annealed at 700°C for 30 min, and consequently nitrogenated at 460°C for 4 h. The best result for the coercivity i H c of the Sm 12.5Fe 87.5N γachieved is 18.9 kA/cm (23.7 kOe).
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