The solid state method was used to synthesize the mixed spinel ferrites where x is the increments of Ni content. The net magnetization (M net) of the prepared samples was calculated according to the suggested cations distribution. The calculated magnetization of tetrahedral (T d) site (M T) unchanged, while the magnetization of octahedral (O h) site (M O) and M net decreased due to increasing Ni 2+ ions. The measured values of M net showed the same behavior as the calculated values, which decreased exponentially with increasing of the Ni concentrations. In addition, M net increased with increasing of applied magnetic field (H), which showed a normal behavior for the ferrites system. The ratio of Fe T /Fe O indicated that the relative number of the Fe 3+ ions on O h sites decreased with increasing Ni content. The ionic radii of T d sites () unchanged where the radii of O h sites () increased with increasing of the Ni 2+ ions. The values of the average ionic radii increased with increasing of Ni 2+ ions. The expected values of lattice parameter () increased, where the values of oxygen parameter and decreased with more incorporation of Ni content. All the interionic distances (bond lengths (BLs)) changed due to increasing of Ni contents. The bond angles , , , and were calculated. The values of , and increased and the decreased with increasing of Ni 2+ ions. The relative permeability () increased with increasing of the filed H and decreased with the increase in in composition x.Substitution of the Ni 2+ ions has a tremendous influence on the properties of Li-spinel ferrite such the magnetic properties.
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