Magnetic and dielectric properties of magnesium substituted cobalt ferrite samples synthesized via one step calcination free solution combustion method

Thomas, Nygil; Jithin, P. V.; Sudheesh, V. D.; Sebastian, Varkey

doi:10.1016/j.ceramint.2017.03.031

Cited by 44 publications

(11 citation statements)

References 32 publications

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“…In ferrites, the distance between the A and B sites is too high, so there is little chance of hopping between the cations in these two sites. However, it is more likely to jump between neighboring B sites (Thomas et al, 2017). However, some x values have fluctuations rather than a linear decrease, and even peaks that can be called a relaxation peak.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…However, some x values have fluctuations rather than a linear decrease, and even peaks that can be called a relaxation peak. tan has the highest value when the frequency of the hopping charge between the cations is equal to the applied frequency (Thomas et al, 2017). The change in tan can be influenced by factors such as the composition of the material, preparation method and the amount of Fe 2+ ions (Sharma et al, 2016).…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…M 2+ and Fe 3+ ions are distributed in these sites (Manikandan et al, 2015). This distribution between the two sites affects the magnetic properties of the materials (Thomas et al, 2017). Ferrites can be produced by many different production methods such as; sol-gel [8], chemical co-precipitation method (Şaşmaz Kuru et al, 2017), solid state reaction route (Vasoya et al, 2016), oxalate precursor chemical method (Ghodake et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Electrical Propertiesmentioning

confidence: 99%

Section: Electrical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…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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“…This allows the preparation of materials with extremely useful functional properties, especially in the field of magnetic devices 25,26 due to its well documented magnetic and dielectric properties. [27][28][29][30][31] Most approaches aiming to prepare mixed ferrites involve combustion reactions 17,28,32 or coprecipitation followed by a heat-treatment step at higher temperatures. 16,18,19,25 Other approaches 17 such as solid-state reactions, 25 micro-emulsion, 33 batch hydrothermal, 19 reverse micelle 34 and evaporation routes.…”

Section: Introductionmentioning

confidence: 99%

Quaternary ferrites by batch and continuous flow hydrothermal synthesis: a comparison

et al. 2019

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Magnetic and dielectric properties of magnesium substituted cobalt ferrite samples synthesized via one step calcination free solution combustion method

Cited by 44 publications

References 32 publications

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

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

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

Quaternary ferrites by batch and continuous flow hydrothermal synthesis: a comparison

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