Dielectric properties of Ti⁴⁺ substituted BaFe₁₂O₁₉ nanoparticles

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• 作者：A.I. Ghoneim^a ; ^{mona_ghoneim@yahoo.com} ; ^{amina.ali@science.tanta.edu.eg} ; M.A. Amer^a ; T.M. Meaz^a ; S.S. Attalah^b
• 关键词：BaTixFe12-(4/3)xO19 nanoparticles ; AC conductivity ; Dielectric constant and loss ; Activation energy ; Magnetic permeability
• 刊名：Physica B: Condensed Matter
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：507
• 期：Complete
• 页码：1-12
• 全文大小：2795 K
• 卷排序：507

文摘

Series of nanocrystalline BaTixFe12-(4/3)xO19 hexagonal ferrites, 0≤x≤1, was prepared using the chemical co-precipitation method. As-prepared samples were heated at 1200 °C for 20 h and slowly cooled to room temperature (RT). XRD studies proved that the samples have single phase M-type hexagonal nanostructure, where their grain size lies in the range of 42.4 – 61.3 nm. Their dielectric properties were studied against temperature (T) and frequency (F). DC conductivity showed increase against T, whereas AC conductivity showed increase with increasing both T and F. This proved the semiconducting behavior of the samples. Activation energies were found to lie in the range of 0.054–0.169 eV for temperature range of RT ~373 K and of 0.114–0.274 eV for higher temperatures up to 473 K. Variation of the dielectric constant and AC conductivity against F revealed dispersion in all these hexagonal nanostructures, which was assigned to Maxwell–Wagner type of interfacial polarization. Variation of the dielectric loss tangent against F showed a relaxation spectrum for all samples, whereas the dielectric constant and loss tangent showed an increasing trend against T. The relative magnetic permeability μr showed an increasing trend with temperature.