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RISS 인기검색어
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- 저자 : Kazi Hanium Maria (검색결과 3 건)
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Tamanna Mariam,I. N. Esha,M. N. I. Khan,Shamima Choudhury,Kazi Hanium Maria 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
A series of Co1-xZnxFe2O4 ferrites with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 were synthesized using the standard double sinteringceramic technique. The single-phase cubic spinel structure of the samples was confirmed from the X-ray diffraction patternsand the sharp high intensity peak revealed that the samples are in good crystalline form. The lattice parameters were observedto increase with the increasing of Zn concentration. By increasing the concentration of Zn content, a significant increase in thedensity and a subsequent decrease in porosity and grain size were observed. The dielectric constant (ε′) of the sample is foundto decrease with the increase in frequency. Dielectric relaxation peaks were observed for the frequency dependence of dielectricloss curves. The dc resistivity at different temperatures was studied and all the samples were of semiconductor nature. Thesaturation magnetization was found to be reduced as the Zn substitution was increased and consequently permeabilitydecreases.
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F. T. Z. Toma,I. N. Esha,Md. Al-Amin,M. N. I. Khan,Kazi Hanium Maria 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.10
The structural, electrical and magnetic properties have been investigated for Ca and Sr substituted Ba1-x(Ca0.5Sr0.5)xFe0.5Ti0.5O3(where x = 0.0, 0.1 0.2, 0.3, 0.4) which have been synthesized by a solid state reaction technique and sintered at 1200 oC for 3 hours. In this study BaTiO3 is modified with Fe in lattice B-site. The X-ray diffraction pattern of the prepared samples have indicated single phase cubic perovskite structure. Lattice constant of the samples have decreased with the increasing Ca and Sr contents which follows Vegard’s law. The microstructure of the samples showed that the grain growth rate was greately changed by doping contents. Doping contents have influenced the dielectric constant within the frequency range of 1 kHz to 120 MHz. It is observed that AC resistivities of the prepared samples have been decreased with increasing frequency while DC resistivities have been decreased with increasing temperature confirming the semiconductor behavior of the prepared ceramics. The magnetic hysteresis loops had also been observed by VSM at room temperarure. The initial permeability followed decreasing trend with increasing doping contents. The structural, electrical and magnetic properties have been investigated for Ca and Sr substituted Ba1- (Ca0.5Sr0.5)xFe0.5Ti0.5O3(where x = 0.0, 0.1 0.2, 0.3, 0.4) which have been synthesized by a solid state reaction technique and sintered at 1200 oC for 3 hours. In this study BaTiO3 is modified with Fe in lattice B-site. The X-ray diffraction pattern of the prepared samples have indicated single phase cubic perovskite structure. Lattice constant of the samples have decreased with the increasing Ca and Sr contents which follows Vegard’s law. The microstructure of the samples showed that the grain growth rate was greately changed by doping contents. Doping contents have influenced the dielectric constant within the frequency range of 1 kHz to 120 MHz. It is observed that AC resistivities of the prepared samples have been decreased with increasing frequency while DC resistivities have been decreased with increasing temperature confirming the semiconductor behavior of the prepared ceramics. The magnetic hysteresis loops had also been observed by VSM at room temperarure. The initial permeability followed decreasing trend with increasing doping contents.
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I. N. Esha,Md. Al-Amin,F. T. Z. Toma,Enayet Hossain,M. N. I. Khan,Kazi Hanium Maria 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
Conventional double sintering ceramic method has been followed to prepare a series of Eu substituted Ni0.4Zn0.45Cu0.15Fe(2-x) EuxO4 (NZCFEO) ferrites with x = 0.00, 0.02, 0.04, 0.07, 0.10, 0.12, 0.15. X-ray diffraction peaks confirm the single phase cubic spinel structures of all the samples. The lattice parameter is found to be distorted with the addition of Eu into the samples. X-ray density and bulk density increase with the increase of Eu content. Better crystallization has been obtained with the decreasing porosity as a result of increasing Eu3+ concentration. The dielectric constant of the samples shows a decreasing trend while both AC and DC resistivities are observed to increase with the increase of Eu3+ concentration. The high resistivity offers greater value of the activation energy. Permeability is found to decrease with increasing Eu content. Saturation magnetization changed significantly with Eu3+ concentration. Noteworthy decrease of the Curie temperature is observed with the addition of Eu substituent.
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