Study of dielectric behaviour of Mn–Zn nano ferrites

Thakur, Atul; Mathur, Preeti; Singh, M.

doi:10.1016/j.jpcs.2006.11.028

Cited by 141 publications

(50 citation statements)

References 15 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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“…At higher frequencies (10 MHz and 100 MHz), the dielectric constant increases gradually with increase in temperature while at lower frequency (1 MHz and 5 MHz); the rate of increase in dielectric constant with temperature is much higher than tested at two other frequencies. This increasing behaviour of dielectric constant with temperature is similar to that realized by Thakur et al [10] At a fixed temperature designated as dielectric transition temperature (T d ); the maximum value of dielectric constant is realized. For our sample, this temperature is 563 K. Beyond this dielectric transition temperature, the values of the dielectric constant is again found to decrease continuously.…”

Section: Dielectric Properties Dielectric Constantsupporting

confidence: 86%

Dielectric Behaviour of Ni_0.2Cu_0.2Zn_0.6Fe₂O₄ Spinel Ferrite

Parashar

Saxena

Sharma

et al. 2015

Macromolecular Symposia

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Summary: Dielectric properties such as dielectric constant (e 0 ) and dielectric loss tangent (tan d) are reported for Cu substituted Ni-Zn ferrite having formula Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 prepared by sol-gel auto combustion method. T he variation of dielectric constant, dielectric loss tangent and A. C. conductivity with frequency are measured in the frequency range 1000 Hz to 120 MHz at room temperature. the real part of dielectric constant decreases with the increase in frequency where as the A. C. conductivity (s ac ) increases with increase in frequency. The relation of tan d with frequency shows resonance peak. Dielectric constant as a function of temperature is studied at different temperatures ranging from 353 K to 583 K.

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“…The grain boundaries are the regions of mismatch between the energy states of adjacent grains and hence act as barriers to the flow of electrons. Another advantage of the small grain size is that it helps in reducing Fe 2+ ions as oxygen moves faster in the smaller regions, thus keeping Fe ions in Fe 3+ state [21]. Due to these size effects the conductivity of the samples of 4 and 3 nm is smaller.…”

Section: Ac Conductivitymentioning

confidence: 99%