Preparation and Characterization of HGM-Ni0.5Co0.5Fe2O4 Core-shell Particles by Homogeneous Coprecipitation
作者单位：School of Materials Science and EngineeringBeihang University
会议名称：《中国材料大会2012》
会议日期：2012年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
关 键 词：Homogeneous coprecipitation HGM-Ni0.5Co0.5Fe2O4 Core-shell particles Magnetism
摘 要：HGM-Ni0.5Co0.5Fe2O4 core-shell particles were prepared by plating Ni0.5Co0.5Fe2O4 magnetic film on hollow glass microsphere （HGM） from the aqueous solution containing NiCl2·6H2O, FeCl2·4H2O, CoCl2·6H2O and HGMs without sintering. Urea was used as precipitator, and air was used as oxidizer in homogeneous coprecipitation process. The morphologies, phase structures, shell thickness, chemical compositions and magnetic performances of the core-shell particles were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray spectroscopy （EDS） and vibrating sample magnetometer （VSM）, respectively. The results showed that a compact and continuous film with thickness at about 250 nm was coated on the HGM by the homogeneous coprecipitation process. The film was spinel ferrite phase, and was determined as the Ni0.5Co0.5Fe2O4 . The saturation magnetization （Ms） and the coercivity （Hc） of as-synthesized HGM-Ni0.5Co0.5Fe2O4 core-shell particles were 20.886emu/g and 97.174G, respectively.