This work investigated the effect of dysprosium(Dy)ions on the structural,microstructural and magnetic properties of nickel nanospinelferrite,NiFe2 O4.The nanoparticles(NPs)of NiDyxFe(2-x)O4(0.0≤x≤0.1)were prepared ...This work investigated the effect of dysprosium(Dy)ions on the structural,microstructural and magnetic properties of nickel nanospinelferrite,NiFe2 O4.The nanoparticles(NPs)of NiDyxFe(2-x)O4(0.0≤x≤0.1)were prepared via the hydrothermal method.The formation of cubic phase of Ni nanoferrite was confirmed through X-ray diffraction,field emission scanning and transmission electron microscopy.Moreover,the magnetic properties of NiDyxFe(2-x)P4(0.01≤x≤0.10)NPs were discussed.The magnetization versus field,M(H)curves exhibit super paramagnetic nature at room temperature and ferrimagnetic nature at low temperature(10 K).A noticeable improvement in the different deduced magnetic parameters is obtained especially for the NiDy(0.07)Fe(1.93)O4(x=0.07)product.The obtained result is mostly derived from the substitution of Fe^3+ions of smaller ionic radii with Dy^3+ions of larger ionic radii that will strengthen the super exchange interactions among nanoparticles.The calculated squareness ratios are found to be much less than 0.5,due to the effect of spin disorder in the surface regions of NiDyxFe(2-x)O4(0.01≤x≤0.10)NPs.The Dy^3+ions substitution increases the magnetic hardness(higher values of remanence Mr,coercivity Hc,and magnetic moment nB)of nickel nanoferrite samples.展开更多
文摘This work investigated the effect of dysprosium(Dy)ions on the structural,microstructural and magnetic properties of nickel nanospinelferrite,NiFe2 O4.The nanoparticles(NPs)of NiDyxFe(2-x)O4(0.0≤x≤0.1)were prepared via the hydrothermal method.The formation of cubic phase of Ni nanoferrite was confirmed through X-ray diffraction,field emission scanning and transmission electron microscopy.Moreover,the magnetic properties of NiDyxFe(2-x)P4(0.01≤x≤0.10)NPs were discussed.The magnetization versus field,M(H)curves exhibit super paramagnetic nature at room temperature and ferrimagnetic nature at low temperature(10 K).A noticeable improvement in the different deduced magnetic parameters is obtained especially for the NiDy(0.07)Fe(1.93)O4(x=0.07)product.The obtained result is mostly derived from the substitution of Fe^3+ions of smaller ionic radii with Dy^3+ions of larger ionic radii that will strengthen the super exchange interactions among nanoparticles.The calculated squareness ratios are found to be much less than 0.5,due to the effect of spin disorder in the surface regions of NiDyxFe(2-x)O4(0.01≤x≤0.10)NPs.The Dy^3+ions substitution increases the magnetic hardness(higher values of remanence Mr,coercivity Hc,and magnetic moment nB)of nickel nanoferrite samples.
