Magnetic and dielectric properties of barium titanate-coated barium ferrite

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• 作者：Chao Wang ; Xijiang Han ; Ping Xu ; Xiaohong Wang ; Xueai Li ; Hongtao Zhao
• 关键词：Barium ferrite ; Barium titanate ; Magnetic properties ; Dielectric properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2009
• 出版时间：12 May 2009
• 年：2009
• 卷：476
• 期：1-2
• 页码：560-565
• 全文大小：994 K

文摘

Flaky barium ferrite with hexagonal molecular structure was successfully prepared by reverse microemulsion method, and was coated with barium titanate through a coordination–precipitation technique. The prepared composite particles were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), vibrating sample magnetometry (VSM) and vector network analyzer. Barium ferrite nanoparticles are proved to be single magnetic domains and the lattice volume is expanded slightly after being covered with spherical barium titanate (average diameter: 43.7 nm). Magnetic parameters of BaTiO₃-coated BaFe₁₂O₁₉ are lower than those of pure BaFe₁₂O₁₉ due to nonmagnetic characteristic of BaTiO₃, while the coverage of BaTiO₃ thin layer on the surface of BaFe₁₂O₁₉ particles changes the dielectric properties due to the interfacial effect. Finally, a novel model is established to pre-estimate the permittivity and shows excellent agreement with measured value.