LAUSR

Abstract MnZn ferrite powders were prepared by a novel nano-in-situ composite method. The precursor powders were calcined at varying temperatures from 400 to 1200 °C to find the influences of calcination temperature on microstructure and magnetic properties of MnZn ferrite powders. The X-ray diffraction (XRD) patterns revealed that pure MnZn ferrite phase was obtained after calcining at 1060–1080 °C. Some hematite (α-Fe2O3) impurities appeared in other calcined samples. The Raman results were also revealed this phenomenon. The crystallite size increased with the temperature increasing, and then decreased. The particle size was larger than the crystallite size. The nearly hollow spheres morphologies were displayed under 1200 °C. The small particles composed hollow spheres became more and more noticeable and regular with increasing temperature until 1200 °C. The saturation magnetizations (Ms) increased firstly and then decreased with temperature, and the maximum value 53.46 emu/g was obtained at 1060 °C. The remanence (Mr), coercivity (Hc) and squareness ratios (Mr/Ms) are not regular variations with temperature increasing.