Title :
Magnetism of intermetallic nitrides: a review
Author :
Wallace, W.E. ; Huang, M.Q.
Author_Institution :
Adv. Mater. Corp., Pittsburgh, PA, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
A brief review of recent work dealing with nitrides of selected intermetallic compounds is presented. Emphasis is on those systems which are of potential significance for high-energy permanent magnet fabrication. Of the many nitrogenated intermetallics that have been studied, only Sm2Fe17Nx and NdTiFe11Nx seem promising for permanent magnet fabrication. Nitrides of the 2:17 intermetallics show that only the Sm compound has appropriate properties. This is unfortunate because of the scarcity and high cost of Sm. This can be alleviated partially by replacing a portion of Sm with Mischmetal. Considerable replacement can be effected with only slight loss of the desirable properties. It is further pointed out that conventional powder metallurgical techniques are unsuitable for magnet fabrication using the nitrides because these compounds decompose at sintering temperatures. Bonded magnets using Zn as the bonding agent lead to 10 MGOe magnets
Keywords :
Curie temperature; coercive force; ferromagnetic properties of substances; iron alloys; lattice constants; magnetic anisotropy; materials preparation; neodymium alloys; nitridation; permanent magnets; reviews; samarium alloys; titanium alloys; Curie temperature; Mischmetal; NdTiFe11Nx; Sm2Fe17Nx; anisotropy field; bonded magnets; coercive force; high-energy permanent magnet fabrication; intermetallic nitrides; lattice parameters; magnet fabrication; nitrogenated intermetallics; review; Anisotropic magnetoresistance; Doping; Fabrication; Intermetallic; Magnetic anisotropy; Magnetic materials; Permanent magnets; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on