Reference : Magnetic properties of iron nitride-alumina nanocomposite materials prepared by high-ene...
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/100416
Magnetic properties of iron nitride-alumina nanocomposite materials prepared by high-energy ball milling
English
Mishra, S. R. [> > > >]
Long, G. J. [> > > >]
Grandjean, Fernande mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Hermann, Raphaël mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Roy, S. [> > > >]
Ali, N. [> > > >]
Viano, A. [> > > >]
2003
European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics
Springer Science & Business Media B.V.
24
1-3
93-96
Yes (verified by ORBi)
International
1434-6060
New York
NY
[en] The structural and magnetic properties of the granular iron nitride-alumina composite materials: (FexN)(0.2)(Al2O3)(0.8) and (FexN)(0.6)(Al2O3)(0.4), fabricated using high-energy ball milling have been determined by using X-ray diffraction, Mossbauer spectroscopy, and magnetization measurements. The Mossbauer spectra, fit with a distribution of hyperfine fields between zero and 40 T. indicate that the weighted average field decreases with increasing milling time. The isomer shift increases with milling time because of a reduced iron 4s-electron density at the grain boundaries. Coercive fields as high as 325 and 110 Oe are obtained for (FexN)(0.2)(Al2O3)(0.8) at 5 and 300 K, respectively; the increase in the coercive field upon cooling indicates the presence of superparamagnetic particles. The coercive field increases with milling time because of the reduced particle size. The decrease in the magnetization results from the increase in both the superparamagnetic fraction and the concentration of surface defects with increased milling time.
http://hdl.handle.net/2268/100416
10.1140/epjd/e2003-00146-1

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