Abstract
The structure and magnetic properties of mechanically alloyed (MA) Nd 10Fe 76B 8− x V 6+ x series and their nitrides have been studied. With increasing V content, the magnetic main phase of Nd 10Fe 76B 8− x V 6+ x series changes from the magnetic phase of Nd 2Fe 14B-type structure via a metastable Nd(Fe,V) 7 phase with TbCu 7 structure to Nd(Fe,V) 12 phase with ThMn 12 structure. The easy in-plane magnetization of Nd(Fe,V) 7 and Nd(Fe,V) 12 phases results in rather poor permanent magnetic properties. The V-containing Nd 2Fe 14B-type phase is partly decomposed upon nitrogenation. Because nitrogen enters into the interstitial sites of the TbCu 7-type and ThMn 12-type structures, their Curie temperatures are greatly enhanced. The easy magnetization of Nd(Fe,V) 7 with TbCu 7, like Nd(Fe,V) 12 with ThMn 12 structure, changes from easy in-plane to easy c-axis after nitrogenation.
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