Abstract
The Ce-substituted (Nd1−xCex)12.2Fe81.6B6.2 (x = 0.0, 0.2, 0.4, 0.6) nanocrystalline ribbons were prepared by annealing amorphous ribbons from melt spinning. It is found that all ribbons are in a multiphase state consisting of α-Fe phase, Nd(Ce)-rich phases and RE2Fe14B (RE = Nd, Ce) phases. However, the coercivity of all annealed ribbons can reach a considerably high value without doping any heavy rare earth or other coercivity enhanced elements. A strong intergranular exchange coupling appears in these nanocrystalline ribbons. The Nd12.2Fe81.6B6.2 ribbons with multiphase have a coercivity of about 11.3 kOe, and the coercivity decreases slightly with increasing Ce content. A coercivity of 7.5 kOe can be obtained when 60 at% of Nd is replaced by Ce (x = 0.6) due to the grain refinement and the strong intergranular exchange coupling. This provides a practical approach of fabricating high coercivity Ce-substituted Nd-Fe-B materials.
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