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The source of free iron in zinc-bonded permanent magnets based on Sm2Fe17Nx

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3 Author(s)
B. Reinsch ; Max-Planck-Inst. fuer Metallforschung, Inst. fuer Werkstoffwissenschaft, Stuttgart ; H. H. Stadelmaier ; G. Petzow

The principal phase resulting from the reaction of Sm2Fe17 with zinc is a solution of Sm in Γ-Fe-Zn. At the maximum Sm content, this cubic phase with α=0.8984 nm has an approximate composition of (at.%) 5 Sm, 42 Fe, 53 Zn, and has no permanent magnetic moment between 4.2 and 600 K. The phase equilibria of the low-Sm alloys in Sm-Fe-Zn show that isostructural Sm2Fe17 and Sm2Zn17 are not miscible and that, because of the pervasiveness of equilibria with α-Fe, it will be difficult to eliminate α-Fe completely from Zn bonded magnets

Published in:

IEEE Transactions on Magnetics  (Volume:29 ,  Issue: 6 )