Title :
Mechanically alloyed Sm-Fe-N magnets with addition of Ga
Author :
Vasilyeva, E. ; Januszewski, D. ; Leonowicz, M.
Author_Institution :
Fac. of Mater. Sci. & Eng., Warsaw Univ. of Technol., Poland
fDate :
9/1/1997 12:00:00 AM
Abstract :
The magnetic properties and microstructure of Sm-Fe-N magnets with addition of Ga were studied. It was found that the coercivity initially increased and than decreased when Ga content exceeded 0.5 at%. Ga substituted Fe in the lattice of Sm2Fe17 phase and formed a (Sm,Ga)-rich phase at grain boundaries. Deterioration of the magnetic properties, for Ga contents above 0.5 at%, we attribute to a reduced nitrogen solubility in the lattice of the Sm2(Fe,Ga) 17Nx phase and towering of its anisotropy constants
Keywords :
X-ray diffraction; alloying additions; coercive force; ferromagnetic materials; gallium alloys; grain boundaries; iron alloys; lattice constants; magnetic anisotropy; mechanical alloying; permanent magnets; powder metallurgy; remanence; samarium alloys; solid solubility; (Sm,Ga)-rich phase; Curie temperature; Ga addition effect; Sm2(FeGa)17N; Sm2Fe17 phase; anisotropy constants; coercivity; grain boundaries; lattice parameters; magnetic properties; mechanically alloyed Sm-Fe-N magnets; microstructure; reduced N solubility; remanence; Anisotropic magnetoresistance; Coercive force; Gallium alloys; Grain boundaries; Iron; Lattices; Magnetic properties; Magnets; Microstructure; Nitrogen;
Journal_Title :
Magnetics, IEEE Transactions on
