Dielectric and magnetic properties of ZnCo-substituted X hexaferrites prepared by citrate sol–gel process

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• 作者：Haijun ; Zhang ; Zhichao ; Liu ; Xi ; Yao ; Liangying ; Zhang ; Mingzhong ; Wu
• 关键词：Magnetic materials ; Sol&ndash ; gel chemistry ; Magnetic properties ; X-ray diffraction ; Electron microscopy
• 刊名：Materials Research Bulletin
• 出版年：2003
• 出版时间：January 25, 2003
• 年：2003
• 卷：38
• 期：2
• 页码：363-372
• 全文大小：251 K

文摘

Ba₂Zn_2−xCo_xFe₂₈O₄₆ hexaferrites with x=2.0, 1.6, 1.2, 0.8, 0.4 and 0.0 were prepared by citrate sol–gel process. They were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetry-differential scanning calorimetry (TG-DSC). The frequency-response complex dielectric constant and complex permeability of Ba₂Zn_2-xCo_xFe₂₈O₄₆ sintered at 1000–1200°C had been investigated in the range from 100MHz to 6GHz. The pronounced natural resonance phenomena were observed in μ″ spectrum for the samples annealed at 1100 and 1200°C. The natural resonance frequency of Ba₂Zn_2−xCo_xFe₂₈O₄₆ ferrites was intensively affected by the substitution of Zinc ion and annealing temperature.