Structural and magnetic properties of R2Fe14−xTxB (R=Nd, Y; T=Cr, Mn, Co, Ni, Al)

Abstract

Trends in structural and magnetic parameters are presented and discussed for Nd2Fe14−xTxB with T=Cr, Mn, Co, Ni, Al. Some data are also included on the Y analog systems. Partial Al substitution strongly increases c/a. We show that this has to do with preferential occupation of the larger atom (Al) in the σFe layer. Co and Ni substitutions increase Curie temperature (TC) while all others decrease it. Anisotropy constants K for 300 K decrease in all cases investigated compared to Nd2Fe14B. Some discussion is given to the general mode of preferential substitution and the concomitant effects on magnetic anisotropy.

Magnetic properties of Mn substituted Nd–Fe–B composite

“…This result is consistent with the reports that nanocrystal material has lower T c than the conventional material with large grain size [15,16]. The decrease of T c for Nd 2 Fe 14 B phase with the increase of Mn content agrees well with the results reported by Ying-chang Yang, Abache and Benpei Cheng [17][18][19]. Abache [18] and Ben-pei Cheng [19] assumed that the reduction of T c of Nd 2 Fe 14 B phase is related to the increased antiferromagnetic interactions due to the Mn doping.…”

“…The decrease of T c for Nd 2 Fe 14 B phase with the increase of Mn content agrees well with the results reported by Ying-chang Yang, Abache and Benpei Cheng [17][18][19]. Abache [18] and Ben-pei Cheng [19] assumed that the reduction of T c of Nd 2 Fe 14 B phase is related to the increased antiferromagnetic interactions due to the Mn doping. It is of interest to note that in Nd 9 Fe 85Àx Mn x B samples, T c of aFe phase first increases with increasing Mn content from 740 C for x ¼ 0 to 788 C for x ¼ 1 or 1.5.…”

DISTRIBUTION OF Al IN Nd-Fe-Al-B PERMANENT MAGNETS

“…A. Hauet (I), D. Lemarchand (I), B. Labulle (I), J. Teillet (2) and P. Vigier (I) (I) UA 808, Faculte' des Sciences de Rouen, BP 118, 76134 Mont-Saint-Aignan Cedex, France (2) LPCM, INSA, BP 8, 76131 Mont-Saint-Aignan Cedex, France…”

Effect Of DyMn Alloy-Powder Addition On Microstructure And Magnetic Properties Of NdFeB Sintered Magnets

“…In addition, the wettability and continuity of Nd-rich phase can be enhanced by Mn addition because Mn decreases the melting point of Nd-rich phase [4]. However, large amount of Mn addition on the magnet reduces the saturation magnetization because non-magnetic Mn occupying J 2 site loses ferromagnetic coupling with Fe atoms.…”