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- W2092168102 abstract "Doping of nickel ferrites by suitable aliovalent ions was explored in order to synthesize nanocrystalline ferrites. With the doping of Nb 2 O 5 , the size of NiFe 2 O 4 is reduced down to 33 nm. The substitution of Nb 5+ ions essentially break up the ferrimagnetically active oxygen polyhedra and the size of the grains are confined. An increase of coercive field and a decrease of magnetization is observed as the size of NiFe 2 O 4 is reduced. This behavior can be explained introducing core-shell model of magnetic nanoparticles. Mossbauer spectra shows superparamagnetic doublet that supports the presence of smaller sized particles in the specimens. The DC resistivity of the doped specimens decreases by at least five orders of magnitude compared to pure sample. This is ascribed to the presence of an interfacial amorphous phase between the sites." @default.
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- W2092168102 date "2006-05-01" @default.
- W2092168102 modified "2023-09-23" @default.
- W2092168102 title "Nanocrystalline nickel ferrites prepared by doping with niobium ions" @default.
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- W2092168102 doi "https://doi.org/10.1016/j.matlet.2005.10.085" @default.
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