“…17 Moreover, catalytic activity could be induced in the hard magnetic strontium hexaferrite sample by replacing the small fraction of Fe with Cu. 18,19 Therefore, SrFe 12 O 19 powders of various forms and sizes have been made using a variety of procedures, including the sol-gel, hydrothermal, co-precipitation of chemicals, solid-state reaction, and micro-emulsion approaches, among others. One of the practical ways to crystallize the hexaferrite phase at a comparatively lower annealing temperature is to create SrFe 12 O 19 nanoparticles (NPs) using the sol-gel process.…”