Nickel-substituted manganese spinel ferrite nanoparticles for high-frequency applications

Nickel-substituted manganese spinel ferrite NixMn1−xFe2O4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) nanoparticles have been prepared by sol–gel auto-combustion method. X-ray diffraction analysis reveals that prepared nanomaterials are spinel ferrite due to existence of secondary phase. The synthesis parameters such as molarity of reactants, magnetic stirring speed, temperature, amount of citric acid and annealing in ambient atmosphere have been optimized...