Cs corrected STEM-HAADF image subject to analysis (white), Fe L2,3 (green), O K (red) and Mn L2,3 (blue) maps. Image color intensities are normalized to present, they are not proportionate to the element amount, so it is not possible to compare each other.
Summarizing, XRD shows a spinel structure without impurities or other phases and both ICP and EELS analysis show the presence of Fe and Mn in a ratio that suggests that a Mn0.5Fe2.5O4 ferrite has been obtained.