Structural, optical and magnetic properties of Mn_xFe_(3-x)O_4 nanoferrites synthesized by a simple capping agent-free coprecipitation route

摘要

In this work, single phase Mn substituted magnetite (MnxFe3-xO4, x = 0.25-1.50) nanoparticles were synthesized via a simple one-step capping agent-free co-precipitation route and characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared as well as UV-Vis spectroscopies, and vibrating sample magnetometer. The results showed that the lattice constants and particle size increase while the inversion grade of the spinal structure of the samples decreases with Mn content. It was found that the bang gap energy of the synthesized Mn ferrite nanoparticles varies with Mn substitution as a result of the competition between the chemical composition effect and the size effects, while in variations of their magnetization the size effects play the predominant role.