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A series of Al-substituted Mg-Mn ferrite powders with composition Mg 0.8Mn 0.2Al xFe 2−xO4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized with nanosized powders through the coprecipitation method. These powders were annealed at 1250 ∘ for 3 h. Samples were characterized by X-ray diffraction (XRD) technique, field emission scanning electron...