The Influence of the Addition of CaO on the Magnetic and Electrical Properties of Ni–Zn Ferrites

Ali, Nazia Jabeen; Rahman, Jakia; Chowdhury, M.

doi:10.1143/jjap.39.3378

Cited by 18 publications

(8 citation statements)

References 8 publications

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“…Further it shows that the lattice constant increases with increased doping percentage of CaCl 2 from 0.01 to 0.05%. This may be because of occupation of A sites by Ca 2+ ions in spinel [10][11][12][13], due to their larger ionic radius. When the doping percentage of CaCl 2 is increased from 0.05 to 0.10%, the lattice parameter again decreases slightly.…”

Section: Resultsmentioning

confidence: 99%

“…Conduction in ferri region is considered to be due to impurity charge carriers while that in the second region after the transition temperature is due to hopping of charge carriers [20][21][22]. If Ca 2+ ions are introduced in the spinel lattice, they occupy tetrahedral A sites [10][11][12][13]. As can be seen from Table 1 the activation energy (∆E) and resistivity (ρ) increase with doping percentage of CaCl 2 , which can be attributed to the formation of highly resistive thin layer on the grain boundary by Ca 2+ ions [10][11][12][13].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

X-ray, IR and dc electrical resistivity study of CaCl2-doped zinc–copper ferrite system

Lipare

Vasambekar

Vaingankar

2003

phys. stat. sol. (a)

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Polycrystalline soft ferrites, Zn x Cu 1−x Fe 2 O 4 (x = 0.30, 0.50, 0.70, 0.80 and 0.90), doped with controlled amounts of calcium chloride (CaCl 2 ) were prepared by standard ceramic techniques. The samples were characterized using X-ray and IR techniques. These compounds are being developed as humidity sensing materials with a final aim of developing a sensor. The temperature dependence of the dc resistivity (ρ) was studied by the usual two-probe method from room temperature to 500 °C. Parameters such as resistivity (ρ) and activation energy (∆E) were computed and the results discussed on the basis of existing theories.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

X-ray, IR and dc electrical resistivity study of CaCl2-doped zinc–copper ferrite system

Lipare

Vasambekar

Vaingankar

2003

phys. stat. sol. (a)

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“…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%

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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“…These losses in ferrites are generally reflected in the resistivity measurement. Materials with high resistivity (low conductivity) exhibit low dielectric losses and vice versa [29], Increase of loss tangent values in RE-substituted Sr hexaferrites confirms the increase in conductivity [30,31] supporting the Verway conduction mechanism [32].…”

Section: Dielectric Properties Of Rare Earth Doped Sr-m Hexaferritesmentioning

confidence: 66%

Dielectric Properties of Rare Earth Doped Sr‐M Hexaferrites

Singh

Narang

Singh

et al. 2009

Ceramic Transactions Series

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The dependence of dielectric constant ' and dielectric loss tangent tanon frequency and composition have been investigated at fixed temperatures for polycrystalline Ca 0.5 Sr 0.5 Co x Ti x Fe 12-2x O 19 (where 0.0 ≤ x ≤ 0.8) hexaferrites samples prepared by ceramic method. The measurements reveal that the samples under investigation have high values of ' reached to 10 6 at 1 KHz and 600K. The experimental results indicated that ' and tandecrease as the frequency increases and temperature decreases. The studied samples showed an abnormal dielectric loss (or relaxation peaks) which were shifted towards higher frequency as the temperature increases. ' and tan increase as Co and Ti ions substitution increases up to x≤0.4, after that both parameters decreases. The activation energy for dielectric relaxation, E D , was estimated for the samples. It is shown that, E D , have low values (~0.08-0.18 eV) and have inverse proportional with the dielectric constant '.

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The Influence of the Addition of CaO on the Magnetic and Electrical Properties of Ni–Zn Ferrites

Cited by 18 publications

References 8 publications

X-ray, IR and dc electrical resistivity study of CaCl2-doped zinc–copper ferrite system

X-ray, IR and dc electrical resistivity study of CaCl2-doped zinc–copper ferrite system

Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

Dielectric Properties of Rare Earth Doped Sr‐M Hexaferrites

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