In this research work, ferrites with compositions of Ni 0.60 Zn 0.40-x Re x Fe 2 O 4 where x=0.05, 0.10, 0.15 were prepared by double sintering ceramic technique. The samples were pre sintered at 10000 C for 4 hours in air and sintered at 1250 0 C for 3 hours. The influence of Yttrium (Y) substitution on various properties of Ni-Zn ferrites have been studied in this work. Investigations were carried out by the measurements of AC resistivity, Permeability and Curie temperature of the sample. AC resistivity shows the nature of the semiconductor of the samples. The initial magnetic permeability remains constant from low frequency to 10 MHz thenceforth sharply fall to very low values at higher frequencies and again remain constant onward to Zn deficient of Ni -Zn ferrites with substituting of Y. At T = Tc the sharp directress of permeability indicates the samples are good homogeneity.
Article HistoryThe present work is focused on the influence of substitutions rare earth europium ions (Eu 3+ ) in soft poly crystalline Ni-Zn ferrites. A series of ferrite samples of the compositions Ni0.60Zn0.35Eu0.05Fe2O4, Ni0.60Zn0.30Eu0.10Fe2O4 and Ni0.60Zn0.25Eu0.15Fe2O4 were prepared by using double sintering solid state reaction technique. The presintering and sintering were performed at temperature 1000 0 C for 3 hours and 1250 0 C respectively. The phase identification was carried out by using the X-ray diffraction (XRD). The XRD analysis revealed that undoped rare earth in sample shows formulation of cubic spinel structure with no extra peak but Eu 3+ doped samples show additional peaks other spinel structure and corresponding to a second orthoferrite phase. A slightly increase in bulk density has been found with increasing RE content. The average grain size increases significantly with increasing Eu 3+ content. The increase in density and grain growth of the samples may be attributed to the liquid phase at constant sintering temperature. Saturation magnetization, Ms was observed and was found to increase with increasing, Eu 3+ contents. Eu 3+ substitution in the NiZn ferrites leads to increase of Fe 3+ ions on the B-sites and consequently decreases Fe 3+ ions on A-sites which lead to the increase in saturation magnetizations. The change of Ms with the augmentation of Eu 3+ substitution has been explained on the Neel's Collinear two sublattices magnetization model and Yafet-Kittels' non-collinear magnetization model. It is observed that addition of the rare earth europium ions (Eu 3+ ) in polycrystalline Ni-Zn rare earth ferrites play an important role in modification of structural and magnetization characteristics.Contribution/ Originality: The paper's primary contribution is finding that this can be used as magnetic materials for transformer due to the stability of permeability for a high frequency range. Moreover, by studying the literature it is seen that it can be used as anode or cathode materials for Lithium Ion Batteries (LIB).
The samples Fe 73.5-x Cr x Nb 3 Cu 1 Si 13.5 B 9 [x=7, 9, 10 and 12.5 are prepared in the amorphous state in the form of thin ribbons by rapid quenching technique at wheel speed of 25 m s −1 in an Ar atmosphere. The composition was sintered at the temperature 450-8000 C for half an hour. The saturation magnetization (Ms) and Curie temperature (Tc) of these alloys decrease linearly with the increase of Cr content for the entire composition range due to dilution of Fe magnetic moment and weakening of exchange interaction between of magnetic atoms. The critical composition for disappearance of ferromagnetism fall of curve Ms with the replacement Fe by Cr, where the nearest neighbor coupling is longer dominant and intermediate range occur, giving rise to a significant portion of antiferromagnetic interaction. The Curie temperature decreases due the weaker interaction among the Fe magnetic moment. The structural relaxation is associated with the magnetization up to the annealed temperature 600°C and the chemical disorderness arise with reference to enhancement of M of annealed samples. M versus H curves sharply rise which indicates the formation of crystallization and it seems to ferromagnetic and for x=12.5 which is paramagnetic in the amorphous condition with Tc=246 K. This increase of M for the four samples are due to the evolution of ferromagnetic α-Fe (Si) nanograin crystal.
Crystalline La doped Cu-Zn ferrite with compositions Cu0.15Zn0.85LaxFe2-xO4 [ x = 0.00, 0.02, 0.04, 0.06 and 0.08] were synthesized by using conventional solid state reaction method technique. X-ray diffraction pattern (XRD),
Crystalline La doped Cu-Zn ferrite with compositions Cu0.15Zn0.85LaxFe2-xO4 [x = 0.00, 0.02, 0.04, 0.06 and 0.08] were synthesized by using conventional solid state reaction method technique. X-ray diffraction pattern (XRD), scanning electron micrographs (SEM), hysteresis loop (M-H) curves and frequency dependent resistivity were employed to inspect the effect of La3+ doping on the structure, microstructure, magnetic and transport properties of the specimens. All the specimens exhibited fcc type cubic spinel structure where the particle size were within 500-1600 nm range. Magnetically ferromagnetic phenomenon was found for all the samples where the effect of La3+ doping consequence on the variation of various parameters like saturation magnetization (Ms), coercivity (Hc) and remanent magnetization (Mr). The resistivity tuned by frequency for all the samples presented the decreasing phenomenon with the increase of applied frequency.
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