Magnetic and electric modulus properties of In substituted Mg–Mn–Cu ferrites

• Ferrite of composition Mg1−yCuyMn0.1InxFe1.9−xO4 with (0.0 ≤ x ≤ 0.4; y = 0.0; 0.1) has been synthesized.
• Electric, magnetic and Mössbauer studies have been investigated.
• The real and imaginary parts of electric modulus follow the Arrhenius law.
• Saturation magnetization increases up to x = 0.2 and thereafter it decreases.
• Good agreement between the magnetic and Mössbauer effect studies.

Ferrite of composition Mg(1−y)Cu(y)Mn(0.1)In(x)Fe(1.9−x)O4 with (0.0 ≤ x ≤ 0.4; y = 0.0 and y = 0.1) has been synthesized by solid state reaction technique. X-ray diffraction (XRD) patterns of the samples indicated the formation of single-phase cubic spinel structure up to 0.2 and mixed phase for samples x ≥ 0.3. Vibrating sample magnetometer (VSM) measurements indicated that the saturation magnetization increases up to x = 0.2 and thereafter it decreases. Electric modulus analysis was used as a tool to analyze the electrical behavior of the samples. The activation energies extracted from real M′ (ω) and imaginary M″ (ω) peaks were found to follow the Arrhenius law. The area ratio of Fe3+ at the tetrahedral A- and octahedral B-sites was deduced from the spectral analysis of Mössbauer measurements. The results give evidence that In3+ replaces Fe3+ at A-site in the range (0.0 < x ≤ 0.2). As the In3+ content increases; it replaces Fe at B-site.

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