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Cobalt-ferrite nanoparticles: correlations between synthesis procedures, structural characteristics and magnetic properties

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5 Author(s)
Li, Sichu ; Dept. of Chem. Eng., Tulane Univ., New Orleans, LA, USA ; Limin Liu ; John, Vijay T. ; O'Connor, C.J.
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Cobalt-ferrite nanoparticles of size 10 to 15 nm have been synthesized in water-in-oil microemulsions (i.e., reverse micelles). When the Co2+/Fe2+ molar ratio in the precursor solution reaches 1:1 and above, the resultant oxides are identified as having the cobalt ferrite structure. By increasing the Co2+/Fe2+ molar ratio in the precursor from 1:1 to 2:1, the atomic ratio of Co:Fe in the resultant ferrite increases from 0.83 to 1.31. The Co site occupancy is also dependent on the Co2+ /Fe2+ molar ratio in the precursor. The materials are found to exhibit superparamagnetism. The blocking temperatures and coercivities are dependent upon the Co2+/Fe3+ ratio, reaching values as high as 55 K and 7500 G at 10 K, respectively. The correlation between synthesis procedure, site occupancy and magnetic properties enables the control of materials properties through such synthesis

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )