Oscillographic study of the dielectric polarization of Cu-doped NiZn ferrite

Olofa, S. A.

doi:10.1016/0304-8853(94)90016-7

Cited by 25 publications

(10 citation statements)

References 12 publications

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“…This dispersion mechanism at low frequency was explained by the Maxwell-Wagner's two-layer model [27][28][29][30] in agreement with Koop's phenomenological theory [31]. The changing in the dielectric constant maybe explained in terms of space charge polarization which is produced due to the existence of greater conductivity grains in the insulating grain boundaries [32][33][34][35][36][37]. The space charge polarization is formed due to large fine conducting grains separated by thin poor conducting intermediate grain boundaries.…”

Section: Dielectric Responsesupporting

confidence: 57%

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

Donta¹,

Katrapally²,

Pendyala³

2016

NanoWorld J

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Ni-Zn-Al nanoferrites of general formula Ni x Zn 1-x Al Fe O 4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by sol-gel auto combustion technique. The X-ray diffraction and FTIR studies confirmed the formation of single cubic spinel structure. Dielectric performance and AC conductivity of prepared mixed nanoferrites were carried out using LCR impedance meter. It was observed that both dielectric constant and dielectric loss were decreased by increasing the frequency whereas AC conductivity increases with applied frequency but decreases with increasing the Ni 2+ ion substitution for a fixed Al 3+ ion concentration. DC resistivity, activation energy and Curie temperature were calculated by using the two probe experimental method. It was observed that DC resistivity decreased whereas the charge mobility increased with increasing the temperature. DC resistivity and activation energy of the nanoferrite samples were increased with Ni 2+ ion substitution for a fixed Al 3+ ion concentration.

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Section: Dielectric Responsesupporting

confidence: 57%

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

Donta¹,

Katrapally²,

Pendyala³

2016

NanoWorld J

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“…The increase in the dielectric constant with increase in temperature is higher at lower frequency (1 kHz), while at higher frequencies the increase is very small. For the sample with x ¼0.0, a slight decrease in the dielectric constant is observed above 423 K. A similar variation has been reported earlier [15][16][17]. In general the dielectric constant of any material is due to dipolar, electronic, ionic and interfacial polarizations.…”

Section: Variation Of Dielectric Constant With Temperaturesupporting

confidence: 75%

Effect of Cd on the structural, magnetic and electrical properties of nanostructured Mn–Zn ferrite

Venkataraju

Sathishkumar²,

Sivakumar

2011

Journal of Magnetism and Magnetic Materials

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“…The dielectric polarization in the NiAlFeO 4 and NiFe 2 O 4 consists of two components. One is the orientational polarization by the electron hopping between Fe 2+ and Fe 3+ [17,18] which is the dominant mechanism in these two samples. The other minor contribution comes from the ionic and electronic polarizations.…”

Section: Resultsmentioning

confidence: 97%

Crystal structure and the effect of annealing atmosphere on the dielectric properties of the spinels MgAl2O4, NiFe2O4, and NiAlFeO4

2007

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The non-transition metal spinel MgAl 2 O 4 and the transition metal spinels (NiFe 2 O 4 , NiAlFeO 4 ) have been prepared by standard ceramic processing method in the air. The effect of annealing atmosphere on the dielectric properties after sintering has been studied. The annealing atmospheres were N 2 , O 2 , and N 2 -H 2 mixture. Dielectric constant ɛ r and tangent loss tanδ have been characterized by varying the measuring temperature and frequency (5 Hz-5 MHz) using the impedance analyzer. The ɛ r and tanδ of the non-transition metal spinel MgAl 2 O 4 remained unchanged even with varying the annealing atmosphere. While the dielectric properties of the transition metal spinels, NiFe 2 O 4 and NiAlFeO 4 were critically dependent on the annealing atmosphere. Crystal structural models for the samples manufactured in air have been tested by the Rietveld refinement method for both the centrosymmetric Fd-3m and the noncentrosymmetric F-43m. The electron density distributions were determined by the whole pattern fitting based on the maximum entropy method (MEM). The dielectric properties of the samples have been also discussed in terms of the structure and electron distribution analysis results.

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Oscillographic study of the dielectric polarization of Cu-doped NiZn ferrite

Cited by 25 publications

References 12 publications

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

Effect of Cd on the structural, magnetic and electrical properties of nanostructured Mn–Zn ferrite

Crystal structure and the effect of annealing atmosphere on the dielectric properties of the spinels MgAl2O4, NiFe2O4, and NiAlFeO4

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