Dielectric properties of nanocrystalline Co-Mg ferrites

Sharma, Jyoti; Sharma, Neha; Parashar, Jyoti; Saxena, Vishal; Bhatnagar, Deepak; Sharma, Komal

doi:10.1016/j.jallcom.2015.07.103

Cited by 57 publications

(12 citation statements)

References 29 publications

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“…At higher frequencies electronic and ionic polarizations are the main contributors and their temperature dependence is insignificant. Figure also show that dielectric constant is decreasing with an increase in frequency at all temperatures and become temperature independent at 10 MHz frequency in agreement with the results shown in Gagan et al and Jyoti et al This can be explained with a fact that as the space charge carriers requires a finite time to line up their axes in a direction of an applied alternating field thus, when the frequency of the applied field increases, the electrons reverse their direction of motion more often. This decreases the polarization resulting thereby in a decrease of dielectric constant with an increase in frequency .…”

Section: Resultssupporting

confidence: 90%

“…It shows that ac electrical conductivity increases with frequency. This can also be explained by Maxwell–Wanger two layer model . The ac conductivity results are in good agreement with dielectric measurements.…”

Section: Resultssupporting

confidence: 78%

“…As seen from Figure , loss tangent tan δ is minimum at lower temperature and increases with increasing temperature below transition temperature for all frequencies. This could be attributed to the electron hopping between Fe 2+ ↔ Fe 3+ and Co 2+ ↔ Co 3+ ions at adjacent octahedral‐sites is thermally activated on increasing the temperature, therefore loss tangent tan δ increase rapidly with increase in temperature for all frequencies …”

Section: Resultsmentioning

confidence: 99%

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Temperature Dependent Dielectric Behaviour of Nanocrystalline Co_0.5Mg_0.5Cr_0.4Fe_1.6O₄ Ferrite

Jadoun

Jyoti

Dolia

et al. 2017

Macromolecular Symposia

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Chromium substituted Co‐Mg ferrite with composition Co0.5Mg0.5Cr0.4Fe1.6O4 has been synthesized by solgel auto combustion method. X‐ray diffraction technique confirmed the formation of cubic spinel structure with no additional phase. In order to distinguish the effect of crystallite size‐ induced broadening and strain‐ induced broadening of XRD peaks, Williamson and Hall analysis has been performed. Dielectric constant, dielectric loss tangent and ac conductivity have been measured in the frequency range 50 kHz–120 MHz at room temperature. The decrease in dielectric constant with increasing frequency is attributed to Maxwell Wagner model. The variation of dielectric constant and loss tangent with temperature at different frequencies have also been studied.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

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Temperature Dependent Dielectric Behaviour of Nanocrystalline Co_0.5Mg_0.5Cr_0.4Fe_1.6O₄ Ferrite

Jadoun

Jyoti

Dolia

et al. 2017

Macromolecular Symposia

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“…Because of easy fabrications, high efficiencies, thermal stabilities, and low costs of magnesium-ferrites have the broad in scope of applications from low frequencies to microwave frequencies (devices) [6][7]. The excellent magnetic and electrical properties such as high permeability, high electrical resistivity and low dielectric and magnetic losses these ferrites can be used to fabricate as microwave devices like circulators, insulators and phase shifters [8][9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural, W-H plot and size-strain analysis of nano cobalt doped MgFe2O4 ferrite

Vishwaroop

Mathad²

2020

Sci Sintering

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In this study we have investigated structural attribute of Co+2 doped MgFe2O4. Synthesis of Mg1-xCoxFe2O4 ferrite was carried out using co-precipitation method. The formation of spinal ferrite was confirmed through X-ray diffraction. Lattice parameter found to be 8.376748 ? and crystallite sizes in the range 180-365 ? are observed. Various parameters like dislocation density (?D); mechanical properties (strain), Hopping length {tetrahedral site (LA) and octahedral site (LB)}, Bond length (A-O and B-O), and Ionic radii (rA and rB) were reported. The W-H plot and Size-Strain plots were extensively studied and the results have been correlated.

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“…Size, shape, purity and magnetic stability of the ultrafine powder consisting of ferrite nanomaterials depends upon the processing conditions and synthesis method [2][3]. These soft ferrites can be used in different applications like magneto optical recording media and pulse power by varying the different parameters like low temperature annealing, doping, sintering at high temperature [4][5][6][7][8][9]. Ferrites retain the properties like lower dielectric fatalities, higher resistivity, larger Curie temperature, abatement cost and high macerating magnetization.…”

Section: Introductionmentioning

confidence: 99%

Electrical, Dielectric and Magnetic Properties of Mg2+ Doped Zn-Co-La Spinel Ferrites for High Microwave Frequency (5.7-13.4 GHz) Applications

Hassan¹,

Morley²,

Ali³

et al. 2020

Preprint

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In the present research work, Mg 2+ is inserted into Zn 0.4 Co 0.6-x Mg x Fe 1.9 La 0.1 O 4 (X = 0.00, 0.15, 0.30, 0.45, 0.60) soft ferrites prepared by the co-precipitation method. Structural, optical, vibrational, dielectric, electrical and magnetic properties were explored by XRD, SEM, UV, FTIR, SMU two probe, Raman, LCR and VSM methods respectively. XRD pattern revealed the formation of cubic spinel structure in all fabricated nanoferrites by the replacement of Co 2+ ions with Mg 2+ ions. UV-Vis also verified the substitution. The declining nature of optical band gap in the range of 2.65 – 1.85 eV were observed by UV-Vis proving the Mg 2+ ions replacement. Uniform spherical shaped nanoparticles were inspected by SEM investigation in form of microimages confirming the XRD outcomes. DC Electrical resistivity showed remarkable decreasing trend with the enhancement of Mg 2+ concentration from 4.61 x 10 9 to 5.39 x 10 6 Ω-cm as Mg 2+ is more conductive than Co 2+ . Five active phonon modes of Raman were examined by Raman spectroscopy. Dielectric parameters including dielectric losses and impedance demonstrated diminishing trends with the enrichment of Mg 2+ contents. Various magnetic parameters such as magnetic moment (μ B ), anisotropy constant (K), initial permeability (μ i ), Y-K angles (α y-k ) and microwave frequency (ω m ) were disclosed for all nanoferrites. Coercivity (H c ), squareness (SQ), remanance (M r ) and saturation magnetization (M s ) all illustrated significant reducing trends with the addition of Mg 2+ contents. Hence fabricated spinel ferrite materials are highly acceptable in microwave devices and in electrical transformers to remove eddy current losses.

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Dielectric properties of nanocrystalline Co-Mg ferrites

Cited by 57 publications

References 29 publications

Temperature Dependent Dielectric Behaviour of Nanocrystalline Co_0.5Mg_0.5Cr_0.4Fe_1.6O₄ Ferrite

Temperature Dependent Dielectric Behaviour of Nanocrystalline Co_0.5Mg_0.5Cr_0.4Fe_1.6O₄ Ferrite

Synthesis, structural, W-H plot and size-strain analysis of nano cobalt doped MgFe2O4 ferrite

Electrical, Dielectric and Magnetic Properties of Mg2+ Doped Zn-Co-La Spinel Ferrites for High Microwave Frequency (5.7-13.4 GHz) Applications

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Dielectric properties of nanocrystalline Co-Mg ferrites

Cited by 57 publications

References 29 publications

Temperature Dependent Dielectric Behaviour of Nanocrystalline Co0.5Mg0.5Cr0.4Fe1.6O4 Ferrite

Temperature Dependent Dielectric Behaviour of Nanocrystalline Co0.5Mg0.5Cr0.4Fe1.6O4 Ferrite

Synthesis, structural, W-H plot and size-strain analysis of nano cobalt doped MgFe2O4 ferrite

Electrical, Dielectric and Magnetic Properties of Mg2+ Doped Zn-Co-La Spinel Ferrites for High Microwave Frequency (5.7-13.4 GHz) Applications

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Temperature Dependent Dielectric Behaviour of Nanocrystalline Co_0.5Mg_0.5Cr_0.4Fe_1.6O₄ Ferrite

Temperature Dependent Dielectric Behaviour of Nanocrystalline Co_0.5Mg_0.5Cr_0.4Fe_1.6O₄ Ferrite