The effect of annealing on the crystalline structure of CoBi0.1Fe1.9O4 nanoparticles

Nanoparticles of bismuth substituted cobalt ferrite (CoBixFe2-xO4, x = 0.1) were prepared by the co-precipitation method. The structural characterizations of the prepared samples were carried out using X-ray diffraction (XRD) and Fourier transform infrared (FTIR). The crystallite size was determined by Scherrer's equation with the result 18.53 nm for an un-annealed sample and 20.36 nm for the annealed sample. This increase has indicated that annealing can control particle growth. The lattice constant decreases while strain and density in the sample increase with the annealing treatment. The spectral analysis two bands were observed in the range ∼400-600 cm-1 which confirmed the spinel structure of nano ferrites.