Abstract
Sm5Fe17–based magnets, one of the newer permanent magnetic materials, were successfully produced from Sm12.5+XFe87.5-X(x = 0-17.5) melt-spun ribbons by the spark plasma sintering (SPS) method. X-ray diffraction and thermomagnetic studies revealed that the resultant Sm-Fe magnets contained the metastable Sm5Fe17 phase. From further studies, it was found that the amount of Sm5Fe17 phase and the resultant coercivity of the Sm-Fe magnets were highly dependent on the Sm content of the Sm-Fe melt-spun ribbon. The Sm22.5Fe77.5 magnet consisted of the Sm5Fe17 phase and exhibited a large coercivity of 34.2 kOe with a remanence of 46.2 emu/g (0.423T).
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