Preparation of Superparamagnetic of Co0.5Zn0.5Fe2O4 at Room Temperature by Co-precipitation Method and Investigation of Its Physical Properties

Magnetic nanoparticles of cobalt-zinc ferrite (Co0.5Zn0.5Fe2O4) have been synthesized in a homogeneous aqueous solution at room temperature by co-precipitation method without any template and subsequent heat treatment. Synthesis of material is confirmed using XRD from the report of single phase polycrystalline ferrite material and also determined lattice constant. Atomic absorption spectrophotometer was used for the estimation of cobalt, zinc and Fe3+ ions. TEM micrograph shows that the nanoparticles are spherically shaped and the particle distribution is in the range between 6 to 10 nm. VSM shows that the sample is superparamagnetic at room temperature. The variation of AC-susceptibility of the samples with respect to temperature from 80 to 520K was measured and it was found that the blocking temperature is around 195 K. TG-DTA studies confirmed the presence of associated water content in the precipitated nanoparticles and indicated that ferritization was completed. The FTIR spectra of Co0.5Zn0.5Fe2O4 has been analyzed in the frequency range of 400-4000 cm-1. PACS: 75.50.Gg; 75.50.Tt; 78.67.Bf