Enhancement of electric and magnetic properties of Mn–Zn ferrite by Ni–Ti ions substitution

• The results showed that sample of y = 0.05 had dc resistivity improves by 282%.
• The results showed that sample of y = 0.05 had Curie temperature improves by 3.7%.
• We recommended sample y = 0.05 in applications due to higher physical properties.

The effect of Fe3+ ions substitution in the Mn–Zn ferrite by Ni2+ and Ti4+ ions on the structure, magnetic and electric properties was studied. Samples of the general chemical formula Mn0.9Zn0.1Niy TiyFe2−2yO4; (0.0 ⩽ y ⩽ 0.25; step 0.05) were prepared using the standard ceramic method. XRD measurements confirm the formation of single-phase cubic spinel structure. The crystallite size (t) of samples was estimated by Scherrer’s formula to be with the range (74–137 nm). Lattice constant (aexp) was decreased with increasing Ni2+ and Ti4+ ions substitution. The decrease in lattice parameter is based on the smaller ionic radius of the substituted ions Ni2+ and Ti4+ than Fe3+ ionic radius. Molar magnetic susceptibility χM was measured using Faraday’s method as a function of temperature from 300 K to 650 K, and the calculated magnetic constants were reported. The data showed that the room temperature χM decreased with increasing Ni–Ti content. dc electrical resistivity and Seebeck voltage coefficients were measured as a function of temperature using the two probe method. The substitution of Fe3+ ions by Ni2+ and Ti4+ ions in the Mn–Zn ferrite improve the physical properties by increasing resistivity and consequently decreasing the dielectric loss. The sample with y = 0.05 of Ni–Ti content shows a high dc magnetic susceptibility (9.17 emu/g mole), high Cuire temperature (558 K) and relatively higher resistivity (8.2 × 103 Ω m) at room temperature.