Abstract
Coercivity of Nd–Fe–B sintered magnets was obviously enhanced by DyF3 additions with little sacrifice of remanence and squareness factor. An ordered rare-earth oxyfluoride grain boundary phase containing ∼30 at.% F was formed. In addition, the presence of F decreased the thickness of the region of reduced anisotropy of the Nd2Fe14B grain. Dy segregated on the surface of the Nd2Fe14B grains. The individual effects of F and Dy elements on the increased coercivity are discussed based on these results.
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