... magnetization for a formula unit of the Co- and Ni-ferrites can be determined by: BferriteCosxMµ)24( −=− BferriteNisyMµ)4( −=− Magnetic moment of Ni2+ and Co2+ ions is 2Bµ and ... Co- and Ni-ferrites linearly reduces with x and y. Figure 3 presents the saturation magnetization as a function of Co and Ni content. A linear dependence was found in the samples with the Co and ... Fe1−xNixO.Fe2O3 and Fe1−yCoy.Fe2O3 with x = 0.05, 0.1, 0.2, 0.5 and y = 0.2, 0.4 nanoparticles were made by replacing Fe2+ by Ni2+ and Co2+ using NiCl2.6H2O and CoCl2.6H2O,...