Abstract
A series of nanostructured ferrites having chemical composition Mg0.7Co0.3YbxFe2−xO4 (x=0.0–0.08) was prepared by the chemical co-precipitation route. The synthesized samples were characterized by X-ray diffraction (XRD), Thermo-gravimetric analysis (TGA), differential thermal analysis (DTA), vibrating sample magnetometer (VSM) and impedance analyzer. The analysis of XRD patterns confirmed the spinel structure and the crystallite size calculated by Scherer's formula was found in the range of 18–43nm. The crystallite size was small enough to obtain considerable signal to noise ratio in the recording media. The lattice constant was increased from 8.362Ǻ to 8.383Ǻ as the Yb contents were increased in the magnesium-cobalt ferrites. The TGA and DTA were carried out for prepared sample to investigate the thermal decomposition process. Magnetization results obtained from VSM measurements elucidate that the substitution of rare earth ytterbium decreased the saturation magnetization and retentivity. The dielectric properties of the samples were studied at room temperature in the frequency range of 1MHz to 3GHz and the samples exhibited the dispersion in high frequency region. The dielectric constant (ε) and dielectric loss (tanδ) were decreased with the increased frequency and ytterbium doping. The dielectric parameters were explained on the basis of space charge distribution. The dielectric and magnetic parameters suggested that these nano-materials are potential candidates for switching and recording media applications.
Mg0.7Co0.3YbxFe2−xO4 nanostructured spinel ferrites were prepared by chemical co-precipitation technique. The crystallite size was found in the range 18–43nm. The substitutions of rare earth ytterbium decrease the saturation magnetization and retentivity. The dielectric parameters were explained on the basis of space charge distribution. The dielectric and magnetic parameters suggested the possible use in switching and recording media applications.
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•Mg0.7Co0.3YbxFe2−xO4 nanomaterials were synthesized by co-precipitation route.•The crystallite size is found in the range 18–43nm.•The dielectric parameters were damped by Yb incorporation.•These nanomaterials can be useful in switching and recording media applications.