DC resistivity of Ni–Zn ferrites prepared by oxalate precipitation method

Shinde, Tukaram J.; Gadkari, Ashok B.; Vasambekar, P. N.

doi:10.1016/j.matchemphys.2008.03.028

Cited by 94 publications

(31 citation statements)

References 23 publications

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“…The particle size 't', lattice constant 'a', measured density 'dm', X-ray density 'dx' and porosity 'P', were calculated using the standard relations [16,17].…”

Section: Methodsmentioning

confidence: 99%

Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

More¹,

Kadam²,

Kadam³

et al. 2010

Open Chemistry

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A series of CoAl x Cr x Fe 2-2x O 4 systems (x = 0.1 to 0.5 in steps of x = 0.1) spinel ferrites have been synthesized successfully using wet chemical co-precipitation technique. The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and magnetization measurements. The powder XRD patterns confirm the single phase spinel structure for the materials synthesized. X -ray diffraction measurements were performed to yield the lattice constant as function of the amount x corresponding to Al-Cr substitution. Lattice parameters, X-ray density, bulk density and particle size decrease whereas porosity increases with the increase in Al-Cr content, 'x'. Infrared studies show two absorption bands at about 400 cm -1 and 600 cm -1 for octahedral and tetrahedral sites, respectively. Saturation magnetization decreases with the increase in Al-Cr content x. AC magnetic susceptibility measurements were carried out as a function of temperature to measure the Curie temperature, which was found to decrease with Al-Cr content x. The decrease of Curie temperature has been explained by A-B interaction. Sp. z o.o. © Versita

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“…The particle size 't', lattice constant 'a', measured density 'dm', X-ray density 'dx' and porosity 'P', were calculated using the standard relations [16,17].…”

Section: Methodsmentioning

confidence: 99%

Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

More¹,

Kadam²,

Kadam³

et al. 2010

Open Chemistry

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“…The small amount of zinc evaporation at higher temperature does not affect the sintered density of ferrites. It is also observed that the density of ferrite under investigation is higher than reported values of ferrite prepared by oxalate precipitation, ceramic and flash combustion method [33,35,36]. This suggests that microwave sintering favors higher densification and more compaction.…”

Section: Lattice Parameter Bulk Density and Porosity Of The Ni 1-x Zmentioning

confidence: 65%

“…This is due to fact that the higher zinc content enhances sintering and it leads to higher grain growth [32]. It is also observed that grain size of the samples under investigation is bigger than that prepared by flash combustion technique [13] and oxalate precipitation method [33]. In order to confirm the chemical composition, EDS analysis was carried and is shown in Fig.…”

Section: Phase Identificationmentioning

confidence: 99%

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

et al. 2011

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The effect of zinc ion substitution for nickel on structural and magnetic properties of NiZn ferrites is reported. The spinel ferrite system Ni 1-x Zn x Fe 2 O 4 with x0 0.2, 0.3, 0.4 and 0.5 was prepared by microwave sintering method. The uniaxially pressed samples were sintered at various temperatures such as 900°C, 1000°C and 1100°C for 30 min. X-ray diffraction patterns of the samples indicate the formation of single-phase cubic spinel structure. SEM micrographs show that grain size increases with increasing zinc content and sintering temperature. The elemental composition of these ferrites was analyzed by EDS. Lattice constant increases with increase in zinc content, obeying Vegard's law. The effect of composition and sintering temperature on initial permeability as the function of frequency and temperature was studied. The initial permeability of NiZn ferrite increases greatly with increasing Zn content and sintering temperature. The dependence of initial permeability with respect to temperature shows the decrease in the Curie point with increase in zinc content, is the normal behavior of ferrites. The relative loss factor ðtan d μ i = Þ of the order of 10 −2 to 10 −5 in the frequency range from 100 Hz to 1 MHz indicates that the prepared ferrites have relatively high purity.

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“…The lattice constant has remained almost the same but the crystallite size has reduced as shown in Table 1. With the help of the following formula (1) and (2) the theoretical (ρ thy ) and experimental (ρ exp ) densities were determined [10,14] …”

Section: Structural Analysismentioning

confidence: 99%

Electrical Properties of Ni-Zn Ferrite Nanoparticles Prepared by Simplified Sol-Gel Method

Munir

Ahmed

Saqib

et al. 2014

J Supercond Nov Magn

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Ferrites have become the source of attention for scientists due to their variety of physical properties. Their massive use in the electronics industry has made the study of their dielectric, thermal, and optical properties unavoidable. These materials have potential applications in high-frequency devices. The empirical formula for the synthesized nanoparticles is given by Ni 0.5 Zn 0.5 Fe 2 O 4 . Nanoferrites were prepared by a simplified sol-gel method. The crystalline phase; crystallite size; surface morphology; dielectric properties such as AC conductivity (σ AC ), dielectric constant ( ), and dielectric loss (tanδ) as a function of frequency at different temperatures; and DC electrical resistivity as a function of temperature were studied. The Ni-Zn nanoferrite was sintered at 550 • C. The X-ray diffraction (XRD) results showed a spinel cubic structure having a lattice constant a = 8.383Å and crystallite size of 12 nm for the (311) peak after sintering. Scanning electron microscopy showed the particle morphology of the samples. AC conductivity (σ AC ) increases with frequency as well as the temperature. DC resistivity decreased with increase in temperature. The observed behavior could be explained by the Maxwell-Wagner model. Parameters observed were correlated to understand the conduction mechanism.

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DC resistivity of Ni–Zn ferrites prepared by oxalate precipitation method

Cited by 94 publications

References 23 publications

Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

Electrical Properties of Ni-Zn Ferrite Nanoparticles Prepared by Simplified Sol-Gel Method

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