Structure and magnetic properties of Nd_(1.5)Fe_(10.5)Mo_(1.5)N_x prepared by mechanical milling

摘要

Mechanical milling has been applied to prepare Nd Fe Mo magnetic powders. For preparing the single phase Nd 1.5 Fe 10.5 Mo 1.5 compounds with ThMn 12 type structure, a mixture of amorphous phase and α Fe was obtained by ball milling for 4～18 h. In the process of ball milling, the powders went through breaking and recombining, which were closely related to amorphous formation. The powders of nanostructured 1∶12 phase was formed after annealing at 700～850 ℃ for 10～40 min. The optimum magnetic properties were obtained with the following nitriding treatment at 500～550 ℃ for 1～2 h.