均匀共沉淀法制备BaTiO3 -Nix Zn1-x Fe2 O4 核-壳粒子及其性能

以尿素为沉淀剂, 在无后续热处理的情况下, 采用均匀共沉淀法制备了BaTiO3-NixZn1-xFe2O4核-壳粒子. 采用透射电子显微镜(TEM)、 X射线衍射仪(XRD)、 能谱仪(EDS)及振动样品磁强计(VSM)对BaTiO3-NixZn1-xFe2O4核-壳粒子的形貌、 结构、 成分和磁性能进行了表征. 结果表明, 制备的核-壳结构粒子中NixZn1-xFe2O4壳层在BaTiO3颗粒的表面包覆完整. 通过控制共沉淀中NiCl2·6H2O与ZnCl2的摩尔比可以调控BaTiO3-NixZn1-xFe2O4核-壳粒子的磁性; 加入的NiCl2·6H2O与ZnCl2摩尔比为7∶3时制得的核-壳粒子具有较好的磁性能, 其饱和磁化强度和矫顽力分别为26.999 A·m2/kg和902.787 A/m.

Preparation and Characterization of BaTiO3-NixZn1-xFe2O4 Core-shell Particles by Homogeneous Coprecipitation

BaTiO3-NixZn1-xFe2O4 core-shell particles were prepared by plating NixZn1-xFe2O4 magnetic films on BaTiO3 via homogeneous coprecipitation with urea as the precipitator. The phase structure, morphology, particle size, shell thickness, chemical composition and magnetic performance of the core-shell particles were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS) and vibrating sample magnetometer(VSM), respectively. The results show that compact and continuous coatings of NixZn1-xFe2O4 are formed on the surface of the BaTiO3. The magnetic performance of BaTiO3-NixZn1-xFe2O4 core-shell particles could be controlled via regulating the molar ratio of NiCl2·6H2O to ZnCl2 added in the experiment. When the molar ratio of NiCl2·6H2O to ZnCl2 is 7∶3, the saturation magnetization(Ms) and the coercivity(Hc) of the as-sample are 26.999 A·m2/kg and 902.787 A/m, respectively.