Microstructure of sintered ND-Fe-Ga-B magnets with Mo and MoS2 addition

► Coercivity of Nd-Fe-Ga-B alloys can be increased by both Mo and MoS2 addition. ► MoS2 addition is proved to be more effective to improve the coercivity. ► An amorphous Ga rich layer was found in the grain boundary, which can increase the coercivity.