Controlling the Microstructure and Magnetic Properties of Mn-Zn Ferrites Nanopowders Synthesized by Co-Precipitation Method

Nanocrystalline manganese zinc ferrites (MnxZn1-xFe2O4) powders with Mn2+ ions ratio (x) varying from 0.3 to 0.9 have synthesized by co-precipitation method. The results show that single MnxZn1-xFe2O4 phase forms at annealing temperature 1000 degrees C for 2 h. The lattice parameter and crystallite size of the produced Mn-Zn ferrites powders increase with increasing the Mn2+ ion molar ratio. The microstructure and magnetic properties of the produced MnxZn1-xFe2O4 powders depend on the temperature and Mn2+ ion content. The morphology of Mn0.8Zn0.2Fe2O4 powder clearly appears as a homogeneous octahedral-like structure. The saturation magnetization of the Mn-Zn ferrite powders increase as the result of increasing Mn2+ ion ratio to 0.8. A high saturation magnetization (73.64 emu/g) achieves for the Mn0.8Zn0.2Fe2O4 powders annealed at 1100 degrees C for 2 h.