Optimizing the magnetic properties of Ce-containing Nd-Fe-B sintered magnets with la substitution

Abstract

Ce and La-Ce containing magnets with the compositions of [(La0.4Ce0.6)0.4Nd0.6]31.5FebalM2.02B0.96 and (Ce0.4Nd0.6)31.5FebalM2.02B0.96 were prepared by traditional sintering process. The results shows La substitution for Ce occurs in the 2:14:1 matrix phase which suppress the formation of the nonmagnetic CeFe2 phase in the magnet. Moreover, compared to the Ce containing magnet, the grain boundry (GB) phase is thinner and very continuous in the La-Ce containing magnet. The coercivity and the maximum energy product of La-Ce containing magnet increased by 2 kOe and 1.5 MGOe, respecitively.