In this study, nanoparticles for Magnesium ferrite Mg1-xCoxFe2O4 were prepared with different weight ratios for cobalt content (x=0,10,30, and 50)% by using sol-gel auto - combustion method at a sintering temperature of 600 °C, and for six hours. The dependence of crystal structure, morphology, magnetic and optical properties on the type of transition metals (3d) was studied. The XRD analysis of pure and mixed nanoparticle samples confirms the formation of a single-phase cubic spinel structure and free from all additional phases. The sizes of the crystallites were found in the range (47.501, 51.909, 51.160 and 50.533) nm for pure and mixed samples, respectively. The data obtained indicate that cobalt-mixed samples play an important role in physical properties. Replacing cobalt ions with (x = 10)% leads to an increase in size crystalline and decreased in the lattice constant, and when the proportion of cobalt content increases more than that, the opposite occurs.

Ferrite Physical, Magnetic Devices, Practical Applications.