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The effect of substitution of In 3+  and Al 3+  ions on the electrical and magnetic properties of Mn-Zn ferrites has been investigated. The substitution of In 3+  ions for Fe 3+  ions resulted in an increase of lattice parameter, owing to the larger size of In 3+  ions, whereas lattice parameter was found to decrease on substituting Al 3+  ions in place of the Fe 3+  ions, owing to the smaller size of Al 3+  ions. The dc resistivity was found to increase with the substitution of In 3+  and Al 3+  ions in the Mn-Zn ferrite system. The improvement in the dc resistivity has been observed at the expense of deterioration in the magnetic properties of Al 3+  substituted Mn-Zn ferrites. A significant reduction in the values of initial permeability, saturation magnetization and Curie temperature was observed with successive increase of Al 3+  ions. The saturation magnetization and initial permeability were found to increase with incorporation of In 3+  ions. A marked increase in the value of initial permeability was found for the Mn 0.4 Zn 0.6 In 0.5 Fe 1.5 O 4  ferrite. Curie temperature was found to decrease with an increase of In 3+  ion concentration. These changes in the properties are explained on the basis of their magnetic interactions, a modified cation distribution and various models.

Controlling the Properties of Manganese-Zinc Ferrites by Substituting In 3+ and Al 3+ Ions