Effect of Co-Doping on the Structure, Magnetic and Hydrogen Absorption Properties of Fe 17 Dy 2 Compound

The Fe17Dy2Cox (x = 0.0–0.15) compounds were prepared by arc melting method, and then annealed at 800 °C for 100 h. The effect of Co-doping on the structure, magnetic and hydrogen absorption properties was studied by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM), and Pressure Concentration Temperature (PCT). The results show that the unit cell volume and lattice parameter a, b and c of Fe17Dy2Cox increase firstly and then decrease synchronously with the Co content. And Fe17Dy2Cox compounds still keep the Th2Ni17-type hexagonal crystal structure and ferromagnetism with the increase of Co content. For an applied field changed from 0 to 2T, the saturation magnetization (M S ) is tuned from 62.09 Am2/kg at x = 0.0–84.3 Am2/kg at x = 0.15. The content of hydrogen abstraction for Fe17Dy2Cox (x = 0.0, 0.05, 0.1, 0.15) compounds are 0.14, 0.027, 0.034 and 0.03 wt% respectively, which is a novel property in magnet and magnetic materials.