Preparation and Characterization of Manganese-Zinc Ferrites by a Solvothermal Method

Manganese-zinc ferrites (Mn-Zn ferrites) nanocomposites were prepared by a solvothermal method and characterized by X-ray Diffraction, scanning electronic microscope and vibrating sample magnetometer. Effects of different factors, including the ratio of Mn2+ to Zn2+, the temperature and time of solvothermal reaction on the magnetic properties and microstructures of Mn-Zn ferrites were investigated. Results demonstrate that with the rising of reaction time, the particle size becomes bigger and more stable, and the saturation magnetization of the Mn-Zn ferrites nanocomposites increases; when the temperature are 160 and 180 °C, no Mn-Zn ferrites are formed for the temperatures are too low, and the formation temperature of Mn-Zn ferrites spherical particles is 200 °C; rising of Mn2+ concentration can not change the morphology of Mn-Zn ferrites, but will contribute to increasing of the saturation magnetization and decreasing of the coercivity of products obtained.