Title :
The (Zr0.67Sm0.33)(CoCuFe)3 phase in Sm(CoFeCuZr)z magnets
Author :
Missell, F.P. ; de Campos, M.F. ; Romero, S.A. ; Murakami, R.K. ; Neiva, A.C. ; Rechenberg, H.R.
Author_Institution :
DIMCI/DIMAT, Duque de Caxias
Abstract :
The achievement of high coercivity in 2:17 magnets depends upon the presence of Zr, although there is some disagreement as to its role. The important role of Zr in stabilizing the high temperature 1:7 phase has been emphasized. It has been proposed that the function of the Zr might be to improve the imperfect shape of the cell walls and thereby increase coercivity. A Rietveld refinement of an X-ray diffraction spectrum was performed using Topas software. This analysis revealed that the sample consisted mainly (~70%) of a rhombhohedral 1:3 phase with lattice parameters a = 0.5 nm and c = 2.4 nm.
Keywords :
X-ray diffraction; cobalt alloys; coercive force; copper alloys; iron alloys; lattice constants; magnetic transitions; permanent magnets; samarium alloys; zirconium alloys; SmCoFeCuZr; Topas software; X-ray diffraction spectrum; high coercivity magnets; lattice parameters; magnetic phase; rhombhohedral phase; size 0.5 nm; size 2.4 nm; Aging; Coercive force; Heat treatment; Isothermal processes; Magnetic field measurement; Magnets; Phase measurement; Shape; Temperature measurement; Zirconium;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.375820
