Synthesis and Characterization of Manganese-copper Spinel Ferrite Powders

• 作 者: CAO Jun-gang LI Jian-jun DUAN
• 机 构: College of Chemistry,National Key Laboratory of Science and Technology on Advanced Composites in Spe
• 出 处: 高等学校化学研究（英文版）
• 发表日期: 2004年期
• 关键词: Magnetically ordered material Sol-gel process Magnetization
• 基金项目: The Development Program for Outstanding Young Teachers of Harbin Institute of Technology,China;The Opening Funding of the National Key Laboratory of Science and Technology on Advanced Composites in Sp

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(x＜0.5),the copper ions have a tendency to occupy and substitute the Fe3+ at the tetrahedral(A) sites.For samples with a high copper content(x＞0.5),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 Mno.aCuo.2Fe2O4 is sensitive to the calcination temperature.