钛酸钡/钡铁氧体核/壳粒子的电磁性能

doi:10.3724/SP.J.1077.2011.01244

摘要/Abstract

摘要： 在以尿素为沉淀剂制备钛酸钡(BaTiO₃)/钡铁氧体(BaFe₁₂O₁₉)核/壳粒子的基础上, 采用透射电子显微镜(TEM)、X射线衍射分析仪(XRD)、傅里叶变换红外光谱仪(FT-IR)对BaTiO₃/BaFe₁₂O₁₉核/壳粒子前驱物及BaTiO₃/BaFe₁₂O₁₉核/壳粒子的形貌、结构和成份进行了表征, 采用网络矢量分析仪对BaTiO₃/BaFe₁₂O₁₉核/壳粒子的电磁特性进行了研究. 结果表明, 均匀共沉淀制得的BaTiO₃/BaFe₁₂O₁₉粒子呈现核/壳结构, BaFe₁₂O₁₉壳层对BaTiO₃的包覆均匀、完整、光滑; 在2~7GHz, BaTiO₃/BaFe₁₂O₁₉核/壳粒子的ε′和ε″分别为10.7~17.0和0.3~0.6, 均高于BaTiO₃. ε′和ε″的增大是核/壳结构所引起的界面极化加强的结果; BaTiO₃/BaFe₁₂O₁₉核/壳粒子出现了BaTiO₃所没有的磁性能, 其μ′和μ″在2~7GHz远远高于BaTiO3, 表现出了较为明显的磁损耗, 这与磁性BaFe₁₂O₁₉壳层的包覆有关.

关键词: 均匀共沉淀, 核/壳粒子, 钛酸钡, 钡铁氧体, 电磁性能

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

中图分类号:

TB332

刘建华, 游盾, 于美, 李松梅. 钛酸钡/钡铁氧体核/壳粒子的电磁性能[J]. 无机材料学报, 2011, 26(12): 1244-1250.

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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