Frequency and temperature dependence of conductance, impedance and electrical modulus studies of Ni0.6Cu0.4Fe2O4 spinel ferrite

Oumezzine, Elaa; Hcini, Sobhi; Rhouma, F.I.H.; Oumezzine, M.

doi:10.1016/j.jallcom.2017.07.298

Cited by 87 publications

(39 citation statements)

References 49 publications

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“…5c. It can be noticed, that the activation energy of this process is equal to 0.44 eV which is similar to E DC obtained for Ni 0.6 Cu 0.4 Fe 2 O 4 ferrite (0.43 eV) 57 . Moreover, this value is also similar to the activation energy calculated from relaxation times (Eq.…”

Section: Resultssupporting

confidence: 82%

Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

Radoń

Hawełek

Łukowiec

et al. 2019

Sci Rep

130

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The new (Zn,Mg,Ni,Fe,Cd)Fe2O4 high entropy ferrite with average crystallite size 11.8 nm was synthesized in two stages by annealing of co-precipitated amorphous precursor. The dielectric spectroscopy confirms, that the electrical conductivity and polarization processes are associated with the mobility of electrons in the structure of ferrite. It was concluded, that the both, high frequency complex dielectric permittivity as well as complex magnetic permeability are strongly temperature and frequency dependent. The AC electrical conductivity is associated with quantum mechanical tunneling of electrons and related to the transfer of charge carriers between Fe2+ and Fe3+ ions. Moreover, the microwave absorption properties were determined. The best microwave absorption properties have been confirmed in the frequency range 1.9 to 2.1 GHz for a layer which is 0.8–1 cm thick. For this range, reflection loss (RL) is lower than −25 dB and shielding effectiveness (SE) lower than −50 dB.

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Section: Resultssupporting

confidence: 82%

Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

Radoń

Hawełek

Łukowiec

et al. 2019

Sci Rep

130

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“…The Cole-Cole plots between the real part of the electric modulus and imaginary parts of the electric modulus can give good results. The role of grains and grain boundaries is very good because semicircles are observed at all the samples [9,12]. The maximum peak of the diameter observed semicircle increases with the substitution of europium rare earth ions.…”

Section: Sem and Edsmentioning

confidence: 79%

“…For this basis, the graphs plot between real and imaginary parts of electric modulus along the y-axis and the frequency along the x-axis were taken. In copper ferrites, the real parts of the electric modulus M 0 show very low M 0 values at lowerfrequency region and increase linearly with the increase in the frequency of the external applied field [12]. In the case of the imaginary part of electric modulus (M 00 ), high electric modulus at lower-frequency region is shown and again decreases with increase in the frequency of external applied field.…”

Section: Sem and Edsmentioning

confidence: 96%

Enhanced Humidity Sensing Response in Eu³⁺-Doped Iron-Rich CuFe₂O₄: A Detailed Study of Structural, Microstructural, Sensing, and Dielectric Properties

Sathisha¹,

Manjunatha²,

Angadi³

et al. 2020

Mineralogy - Significance and Applications [Working Title]

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The CuFe (2Àx) Eu x O 4 (where x = 0.00, 0.01, 0.02, 0.03) nanoparticles are synthesized by solution combustion method. The influence of Eu 3+ on the structural, morphological, dielectrical, and humidity sensing study is recorded. The XRD pattern peaks of the as-prepared CuFe (2Àx) Eu x O 4 (where x = 0.00, 0.01, 0.02, 0.03) nanoparticle confirm the polycrystalline spinel cubic structure with a small amount of CuO impurity phase at 38.87°and 48.96°. Surface morphology of the samples was studied by scanning electron microscope (SEM) images of the nanoparticles, and their respective average grain size was estimated using Image software. Chemical composition of all prepared samples was analyzed by EDS spectra. The dielectric parameters of AC conductivity, electric modulus, and impedance of the samples were measured over a range of frequencies from 0.1 KHz to 1 MHz at room temperature. Europium-doped copper ferrite samples showed good humidity sensing response, response and recover times, and stability over a %RH range of 11-91%. These types of samples are very useful for sensor application, battery applications, electronic applications, and automotive applications.

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“…In addition to the dielectric constant and impedance, the electrical response of the materials can also be performed by electrical modulus analysis. This method offers an alternative approach based on polarization (Oumezzine et al, 2017). The frequency-dependent change of the real and imaginary parts of the modulus is a method used to examine the relaxation mechanism and compositional and structural dependence of the relaxation time of spinel ferrites (Kaiser, 2016;.…”

Section: Figmentioning

confidence: 99%

“…The ferrites are materials with low mobility and the increase in conductivity does not mean that the number of charge carriers increases. As the conductivity increases, only the mobility of the charge carriers increases (Oumezzine et al, 2017). The hopping length of the charge carriers is related to the energy required to pass the barrier for jump from one cationic zone to another.…”

Section: Figure12 Ac Conductivity Versus Angular Frequencymentioning

confidence: 99%

Frequency Dependence of Dielectric, Conductivity, Impedance and Electrical Modulus Properties of La3+ Substituted in Cobalt- Magnesium Ferrites

Kuru

2021

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, structural, morphological, dielectric and AC conductivity properties of CoMgLa ferrite samples (Co0.5Mg0.5LaxFe2-xO4) were investigated according to the change of x (x=0, 0.1, 0.2, 0.3, 0.4 and 0.5). Samples were synthesized by co-precipitation method. The structural properties were examined using XRD and results show that the prepared sample crystallizes in the cubic spinel structure. Crystallite sizes are changing between 24.92 to 9.80 nm. Morphological and elemental properties were analyzed by SEM and EDX. Dielectric properties were investigated by impedance spectroscopy. The samples showed normal dielectric properties consistent with the Maxwell-Wagner model due to interfacial polarization. When the impedance characteristics were examined, it was found that the relaxation process was compatible with the Cole-Cole model. The results of the modulus show that grains contribute to the relaxation process as well as grain boundaries. AC conductivity exhibited semiconductor behavior. The constant behavior of conductivity at low frequencies is a sign that the examined samples may be suitable for many applications.

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Frequency and temperature dependence of conductance, impedance and electrical modulus studies of Ni0.6Cu0.4Fe2O4 spinel ferrite

Cited by 87 publications

References 49 publications

Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

Enhanced Humidity Sensing Response in Eu³⁺-Doped Iron-Rich CuFe₂O₄: A Detailed Study of Structural, Microstructural, Sensing, and Dielectric Properties

Frequency Dependence of Dielectric, Conductivity, Impedance and Electrical Modulus Properties of La3+ Substituted in Cobalt- Magnesium Ferrites

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Frequency and temperature dependence of conductance, impedance and electrical modulus studies of Ni0.6Cu0.4Fe2O4 spinel ferrite

Cited by 87 publications

References 49 publications

Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

Dielectric and electromagnetic interference shielding properties of high entropy (Zn,Fe,Ni,Mg,Cd)Fe2O4 ferrite

Enhanced Humidity Sensing Response in Eu3+-Doped Iron-Rich CuFe2O4: A Detailed Study of Structural, Microstructural, Sensing, and Dielectric Properties

Frequency Dependence of Dielectric, Conductivity, Impedance and Electrical Modulus Properties of La3+ Substituted in Cobalt- Magnesium Ferrites

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Enhanced Humidity Sensing Response in Eu³⁺-Doped Iron-Rich CuFe₂O₄: A Detailed Study of Structural, Microstructural, Sensing, and Dielectric Properties