Spinel ferrites samples

The spinel ferrites were fabricated by solid state reaction technique. Cobalt and Zinc ferrites CoxZnyFe204,(x=0.7,0.3,0.4,0.2 and y=0.3,0.7,0.6,0.8) were prepared by solid state reaction technique. The crystalline structure of the sample was investigated by X-ray diffraction(XRD). All samples show cubic spinel structure. The lattice parameter decreases with increasing cobalt content. Magnetic properties shows that the prepared sample exhibit ferromagnetic behaviour at room temperature. The saturation magnetization increases with increasing cobalt content. Curie temperature... 

When the particle size is reduced to the nanolevel, contributions from disordering, vacancies, lowering of symmetry at surface, and so on also contribute to considerably modifying the trends seen in bulk. It has been generally observed that the accepted site preferences of cations established in bulk spinel ferrites need not necessarily hold in their nanosized counterparts. For example, the presence of Zn at the octahedral B site is nearly never realized in bulk spinel ferrites, whereas there are several reports wherein Zn is present at the B site in nanosized samples [10]. 

The textural and morphological characteristics of the spinel ferrite nanocrystals we prepared were studied with various techniques to determine the influence of calcination temperature on the crystallization, morphology, and pertide size distribution of the nanocrystals and to explore other parameters of interest. The characterization of the prepared spinel ferrites nanopartides were conducted by using various techniques such as to (TG A), X-ray diffraction (XRD), Fourier transforms infrared spiectroscopy (FTTR), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) verify the partide size and distribution and to explore other parameters of interest.in this section we introduce these techniques. 

---