K. Majima et al., STRUCTURE AND MAGNETIC-PROPERTIES OF SM-2(FE,MN)(17)N-X COARSE POWDERS WITH HIGH COERCIVITY, Journal of applied physics, 81(8), 1997, pp. 4530-4532
The influence of a substitution of Mn for Fe in the Sm-2(Fe,Mn)(17)N-x
alloys on the structure and the magnetic properties was studied. Sm-2
(Fe,Mn)(17)N-x alloy powders of 32-74 mu m in particle size with sever
al values of x were successively synthesized using NH3+H-2 gas. It was
found that the primary phase of the powders maintained the Th2Zn17-ty
pe structure in the wide range for 0<x<6. On the other hand, the coerc
ivity of the powders remarkably increased for x>3. The Sm-2(Fe0.95Mn0.
05)(17)N-5 powder proved to have a coercivity of 0.62 MA/m (7.7 kOe),
without a fine grinding. Microstructural analysis by transmission elec
tron microscopy and energy-dispersive x-ray analysis revealed the powd
er consisted of Sm-7(Fe,Mn)(17)N-3 nanocrystalline grains of 10-30 nm
in diameter surrounded by Mn-enriched amorphous phase. (C) 1997 Americ
an Institute of Physics.