Abstract
Nano-crystalline zinc-substituted cobalt ferrite powders, Co 1-xZnxFe2O4(X=0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0), havebeen synthesized by the Co-precipitation method. The structural and magnetic properties ofthe products were determined and characterized in detail by X-ray diffraction (XRD), High Resolution -Transmission Electron Microscope (HR-TEM) , Fourier Transform Infrared (FTIR)and vibrating sample magnetometer(VSM). X-ray analysis showed that the samples were cubic spinel. The increase in zinc concentrationresulted in an increase in the lattice constant, X-ray density, ionic radii, the distancebetween the magnetic ions and bond lengths on tetrahedral sites and octahedral sites of cubic spinelstructure.The HR-TEM and XRD shows that crystallite size within therange of 6-24 nm. The FTIR measurements between 400 and 2000 cm -1 confirmed the intrinsic cationvibrations of the spinel structure.The variation of saturation magnetization (Ms) value of the samples was studied and Magnetic coercivity.The magnetic measurements show that the saturation magnetization and coercivity decrease by increasing the zinc content. Furthermore, the results reveal that the sample with a chemical composition of Co 0.3 Zn0.7Fe2O4exhibits the super-paramagnetic behavior. Keywords:Nano size, Co-precipitation method, Co 1-xZnxFe2O4, XRD, TEM, VSM, FTIR.
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