Synthesis and Characterization of Manganese-copper Spinel Ferrite Powders

摘要

Magnetic Mn1-xCuxFe2O4(x=0.2,0.5,0.8 and 1.0) nanoparticles were synthesized by single citrate precursor method.The samples were characterized by powder X-ray diffraction,vibrating sample magnetometry and electron paramagnetic resonance(EPR).For samples with a low copper content(x0.5),most Cu2+ enter into the octahedral(B) sites.Transfer of Fe3+ from octahedral sites to tetrahedral sites leads to the decrease of the saturation magnetization.Maximum coercivity is observed for CuFe2O4 nanoparticles due to the strengthened magnetic anisotropy arisen from the Jahn-Teller effect of the octahedral copper ions.The dependence of magnetic properties of Mn0.8Cu0.2Fe2O4 nanoparticles on calcination temperature was investigated.The cation distribution in Mn0.8Cu0.2Fe2O4 is sensitive to the calcination temperature.