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Structural, Magnetic and Dielectric Properties of Fe-Co Co-Doped Ba0.9Sr0.1TiO3Prepared by Sol Gel Technique

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New Journal of Glass and Ceramics 2014年第2期4卷 19-28页

作者： Inas Kamal Batttisha Ibrahim Sayed Ahmed Farag Mostafa Kamal Mohamed Ali Ahmed emad girgis Hesham Azmi El Meleegi Fawzi Gooda El Desouky Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt National Research Center (NRC) Solid State Physics Department Dokki Giza Egypt National Research Centre (NRC) Thin Film Lab Electron Microscope Department Dokki Giza Egypt

The structural, dielectric and magnetic properties of pure and Fe-Co co-doped Ba0.9Sr0.1TiO3, (Ba(1-x)SrxTiO3, where (x = 0.10) and (Ba0.9Sr0.1Ti(1-x-y)FexCoyO3), where (x = 0.1, y = 0) and (x = 0 and y = 0.10) and (x = 0.5, y = 0.5) in powder form, abbreviated as (BST) and (BST10FO), (BST10CO) and (BST5F5CO), respectively were prepared by a modified sol gel technique. Crystallization, surface morphology and electrical behavior of BST are improved by Fe3+ and Co2+ ions with optimized grain size. Phase identification by using X-ray diffraction and surface morphology will be studied by using transmission electron microscope (TEM) and scanning electron microscope imaging (SEM). Phase identification by using X-ray diffraction and surface morphology evaluation by using transmission electron microscope (TEM) and scanning electron microscope imaging (SEM) will be studied. The nano-scale presence and the formation of the tetragonal perovskite phase as well as the crystallinity were detected using the mentioned techniques. The dielectric properties of the prepared samples have been investigated as a function of temperature and frequency. The dielectric measurements are carried out in the frequency range of 42 Hz - 1 MHz, at temperature ranging between 25°C and 250°C. The results showed an abrupt decrease in the dielectric permittivity by increasing the frequency range. The magnetic hysteresis loop confirmed enhancement in the magnetization properties by co-doping with Fe3+-Co2+ ions. An increase in the saturation of the magnetization at room temperature was detected by decreasing the crystallite sizes of the prepared samples.

关键词： Sol Gel Nano-Structure Magnetic Hysteresis Loop Dielectric Permittivity Nano-Composite BaSrTiO3 (BST) TEM XRD SEM

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Dielectric and Magnetic Properties of Nano-Structure BiFeO3Doped with Different Concentrations of Co Ions Prepared by Sol-Gel Method

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New Journal of Glass and Ceramics 2015年第3期5卷 59-73页

作者： Inas Kamal Batttisha Ibrahim Sayed Ahmed Farag Mostafa Kamal Mohamed Ali Ahmed emad girgis Fawzi El Desouki Hesham Azmi El Meleegi Fawzi El Desouki National Research Centre (NRC) Solid State Physics Department 33 Bohouth St Dokki Giza Egypt Metal Physics Laboratory Physics Department Faculty of Science Mansoura University Mansoura Egypt Materials Science Lab (1) Physics Department Faculty of Science Cairo University Giza Egypt National Research Centre (NRC) Thin Film Lab Electron Microscope Department 33 Bohouth St Dokki Giza Egypt

BiFe1-xCoxO3 (x = 0, 0.03, 0.05 and 0.1) symbolic as (BFO, BF3CO, BF5CO and BF10CO) in powder form has been prepared by sol-gel technique using ethylenediamine tetraacetic acid (EDTA) as a chelating agent. X-ray diffraction (XRD) and FTIR analysis showed rhombohedra distorted BiFeO3 structure with compressive lattice distortion induced by the Co substitution at Fe sites. The transmission electron microscope (TEM) shows irregular particles. The additive of cobalt oxide has led to grains refining giving the following crystallite sizes of 18 nm for BF5Co. The scanning electron microscope (SEM) study reveals that the samples morphology shows relatively uniform grain size distribution. The dielectric properties of BiFeO3 nano-particles in the frequency range of 1 up to 5 MHz at RT revealed that the A.C. conductivity of the prepared samples reaches its maximum value in BF5CO. By decreasing BiFeO3 particle size as a result of doping with different Co ion concentrations, an enhancement in magnetization and a simultaneous suppression in current leakage occurred. The remnant magnetization Mr of BiFe1-xCoxO3 (x = 0, 0.03, 0.05, 0.1) ceramics significantly enhanced, which provides potential applications in information storage.

关键词： Nano-Structure Multiferroic BiFe1-xCoxO3 (x = 0 0.03 0.05 0.1) XRD FTIR TEM Remnant Magnetization

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