Characterization of Ni–Cu mixed spinel ferrite

Hoque, S. Manjura; Choudhury, M Amanullah; Islam, Md. Fakhrul

doi:10.1016/s0304-8853(02)00700-x

Cited by 127 publications

(39 citation statements)

References 11 publications

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“…The effect of Zn ion on bulk density and on the porosity was shown in Table 1 3 ) [5]. Moreover this is due to the increase of oxygen vacancies which play a predominant role in accelerating densification i.e.…”

Section: Resultsmentioning

confidence: 98%

“…The microstructure study of ferrites can provide substantial information on various magnetic properties such as permeability. However, microstructures of ferrites are highly sensitive to preparation method, sintering condition, composition including impurities and dopants [4][5][6]. There are many experimental and theoretical investigations on the microstructure and frequency dispersion of complex permeability in polycrystalline ferrites [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

et al. 2012

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Cu-Zn ferrites of composition Cu 1-x Zn x Fe 2 O 4 were prepared by double sintering ceramic technique at 950 0 C and 1050 0 C for 3 hours and 2 hours, respectively. Structural and magnetic properties of the Cu-Zn ferrites were investigated by using X-ray diffraction, microstructure study and complex permeability behaviour. X-ray analysis indicated the formation of single-phase cubic spinel structure for all samples. The lattice parameter was found to increase with increasing Zn content obeying Vegard's law. The X-ray and bulk densities of the Cu-Zn ferrite significantly decreased whereas porosity increased with increasing Zn concentration. Micrographs exhibited decrease in grain size with increasing concentrations. The real part μ'of initial permeability remained constant up to certain lower range of frequency after which it decreased to lower value of permeability. μ' increased with increasing Zn contents up to x = 0.5, after that it decreased with higher Zn content but was also found to increase with sintering temperature. The possible reasons responsible for change in structural, microstructural and complex permeability with increasing of nonmagnetic Zn 2+ ion are ascertained.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

et al. 2012

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“…The electrical conductivity and dielectric behavior of ferrites are strongly depended on the sintering time and temperature, chemical composition, preparation conditions. A good number of studies on electrical conductivity of different ferrite samples with varying compositions have been reported by different workers (El Hiti 1990, Suryavanshi et al 1991, Manjura Hoque et al 2002.…”

Section: Introductionmentioning

confidence: 97%

Dielectric and electrical properties of Cr substituted Mg ferrites

Zakaria

Nesa

Khan

et al. 2015

J Bangladesh Acad Sci

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The spinel ferrites MgCr x Fe 2-x O 4 (0.0    1.0) were prepared through the solid state reaction using conventional ceramic method at 1300C in air. The homogeneous phase of the ferrite samples was observed from the X-ray diffraction study. Lattice parameter of the samples was found to decrease with increasing Cr concentration in the system obeying Vegard's law. The ac electrical resistivity, measured as a function of temperature, decreases with the increase of temperature indicating the semiconducting nature of all the samples. The activation energies were calculated and found to decrease with increasing Cr content. The lower activation energies are associated with higher electrical conductivity. With the increase of temperature, dielectric constant () and dielectric loss tangent are observed to be increased; while with the increase of frequency, dielectric constant () and dielectric loss tangent decrease for all the samples.

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“…The lattice parameter increases due to the increase of cadmium content in the ferrites because of its higher ionic radius compared to other ions in the ferrites. Several researchers have studied the structural, electrical and magnetic properties of substituted ferrites like Ni-Co-Cu [1], Ni-Cd-Zn [12], Ni-Cd [11,[13][14][15], Ni-Cu [16], Mg-Cd [17] and Ni-Mn-Mg [18] mixed ferrites by different methods. However, the literature survey on Ni-Cd-Cu ferrites indicates that not much work has been done on these ferrites.…”

Section: Introductionmentioning

confidence: 99%