Magnetic properties of Sm₅Fe₁₇ melt-spun ribbons and their borides

Sm₅Fe₁₇ melt-spun ribbons exhibited low coercivity and partly or mostly consisted of the amorphous phase. Annealing of Sm₅Fe₁₇ melt-spun ribbon resulted in the formation of the Sm₅Fe₁₇ phase. The annealed Sm₅Fe₁₇ melt-spun ribbon exhibited a high coercivity. It was found that the addition of B to the Sm₅Fe₁₇ alloy resulted in the promotion of the Sm₂Fe₁₄B phase. Annealed Sm₅Fe₁₇B_x (x = 0.5) melt-spun ribbons consisted of the Sm₅Fe₁₇phase together with the Sm₂Fe₁₄B and SmFe₂ phases. On the other hand, annealed Sm₅Fe₁₇B_x (x = 1.0-1.5) melt-spun ribbons consisted of the Sm₂Fe₁₄B and SmFe₂ phases without the Sm₅Fe₁₇phase. The resultant Sm₅Fe₁₇B_x (x = 1.0-1.5) melt-spun ribbons still showed a coercivity of around 2 kOe. The annealed Sm₅Fe₁₇ melt-spun ribbon exhibited a high coercivity over 25 kOe and a remanence of 40 emu/g, whereas the annealed Sm₅Fe₁₇B_1.0 melt-spun ribbon exhibited a high remanence of 65 emu/g and a coercivity of 2.0 kOe