Electromagnetic Properties of BaTiO3/BaFe12O19 Core/Shell Particles

doi:10.3724/SP.J.1077.2011.01244

Abstract

Abstract: Based on the homogeneous coprecipitation synthesis of BaTiO₃/BaFe₁₂O₁₉ core/shell particles by using urea as precipitator, transmission electron microscope (TEM), X-ray diffraction(XRD) and Fourier transform infrared (FT-IR) were used to characterize the morphology, structure and composition of BaTiO₃/BaFe₁₂O₁₉ core/shell particles precursor and BaTiO₃/BaFe₁₂O₁₉ core/shell particles, respectively. Network vector analyzer was used to study the electromagnetic properties of the BaTiO₃/BaFe₁₂O₁₉ core/shell particles in 2-7GHz. The results indicate that, BaTiO₃/ BaFe₁₂O₁₉ particles exhibited core/shell structure. The BaFe₁₂O₁₉ shell coated on the surface of BaTiO₃ is uniform, integrate and smooth. In 2-7 GHz, the real part (ε′) and the imaginary part (ε″) of permittivity of BaTiO₃/BaFe₁₂O₁₉ core/shell particles are in the range of 10.7-17.0 and 0.3-0.6, which are larger than that of BaTiO₃. The increase of permittivity is a result of enhanced interfacial polarization caused by core/shell structure. BaTiO₃/BaFe₁₂O₁₉ core/shell particles exhibited magnetic properties which are not existent in BaTiO₃. BaTiO₃/BaFe₁₂O₁₉ core/shell particles possess much larger real part (μ′) and imaginary part (μ″) of permeability than that of BaTiO₃ and shown obvious magnetic loss in 2-7 GHz, which is owed to the coating of magnetic BaFe₁₂O₁₉ shell.

Key words: homogeneous coprecipitation, core/shell particles, BaTiO₃, BaFe₁₂O₁₉, electromagnetic

CLC Number:

TB332

LIU Jian-Hua, YOU Dun, YU Mei, LI Song-Mei. Electromagnetic Properties of BaTiO₃/BaFe₁₂O₁₉ Core/Shell Particles[J]. Journal of Inorganic Materials, 2011, 26(12): 1244-1250.

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Electromagnetic Properties of BaTiO₃/BaFe₁₂O₁₉ Core/Shell Particles

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