Tailoring the properties of Ni-Zn-Co ferrites by Gd3+ substitution

Hossain, M. D.; Khan, M. N. I.; Nahar, A.; Ali, M. A.; Matin, Md. Abdul; Hoque, S. Manjura; Hakim, M. A.; Jamil, A. T. M. K.

doi:10.1016/j.jmmm.2019.165978

Cited by 42 publications

(20 citation statements)

References 36 publications

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“…The behavior of frequency dependence of ε' for Ni 1-x Zn x Fe 2 O 4 is in good agreement with those of the Y 3+ substituted Mg-Zn ferrites [22], for which ε' continuously decreases with increasing frequency. More dielectric dispersion is observed in the lowfrequency region, which may be due to the Maxwell-Wagner interfacial type of polarization [23,24], which is in good agreement with Koop's phenomenological theory [25]. The decrease in polarization with the increase in frequency may be due to the fact that, beyond a certain frequency of the electric field, the electronic exchange between Fe 2+ and Fe 3+ cannot follow the alternating field; therefore, the dielectric constant decreases with increasing frequency.…”

Section: Resultssupporting

confidence: 77%

Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites

Jadhav

Ramshetti

et al. 2021

Cerâmica

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The spinel ferrite system Ni 1-x Zn x Fe 2 O 4 (x=0-0.7, Δx=0.1) was prepared by wet chemical co-precipitation method using sulfates of respective metal ions. The electrical resistivity and dielectric properties of the prepared samples have been studied as a function of temperature, frequency, and Zn content (x). The DC resistivity (ρ) was measured in the temperature range of 300 to 800 K. The curves so plotted show two phases viz. ferrimagnetic and paramagnetic, wherein the transformation from former to later phase took place at the Curie temperature, T C . The values of T C were found to decrease with the increase in x. The values of activation energy (ΔE<0.2 eV) depicted the possibility of the hopping mechanism governing the conduction within the ferrites. The ferrite samples exhibited semiconducting behavior, where the electrical resistivity (r) decreased with the increasing temperature. The dielectric constant (ε') and dielectric loss (ε") were studied as a function of composition, temperature, and frequency.

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Section: Resultssupporting

confidence: 77%

Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites

Jadhav

Ramshetti

et al. 2021

Cerâmica

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“…The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and level of substituent ion, methods, conditions and sintering temperature for the preparation of ferrites [19][20][21][22].Study of ferrites usually in most cases has been limited to their structural, electrical and magnetic properties [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, study of mechanical properties of ferrites has scientific importance due to their potential applications in industry and in research field.…”

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confidence: 99%

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confidence: 99%

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Ali

Khan

Hossain

et al. 2020

Mater. Res. Express

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We report the synthesis of Y-substituted Mg-Zn [Mg 0.5 Zn 0.5 Y x Fe 2−x O 4 (0x0.05)] ferrites using conventional standard ceramic technique. The samples were characterized by x-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), FTIR spectroscopy, UV-Vis spectroscopy and quantum design physical properties measurement system (PPMS). XRD patterns confirm the single phase cubic spinel structure up to x=0.03 and appearance of a secondary phase of YFeO 3 for higher Y contents. FESEM images depict the distribution of grains and EDS spectra confirmed the absence of any unwanted element. Completion of solid state reaction and formation of spinel structure has been revealed from FTIR spectra. The FTIR data along with lattice constant, bulk density and porosity were further used to calculate the stiffness constant (C ij ), elastic constant and Debye temperatures. Mechanical stability of all studied compositions is confirmed from C ij using Born stability conditions. Brittleness and isotropic nature are also confirmed using Poisson's ratio and anisotropy constants, respectively. The enhancement of dc electrical resistivity (10 5 Ω cm to 10 6 Ω cm) with Y content is observed. The energy band gap (increased with Y contents) is found in good agreement with dc electrical resistivity. Ferrimagnetic to paramagnetic phase change has been observed from the field dependent high temperature magnetization curves. The magnetic moments and saturation magnetization were found to be decreased with increasing temperature. The Curie temperature (T c ) has been measured from temperature dependent magnetic moment (M-T) and initial permeability (μ′ i -T) measurements and found to be in good agreement with each other. Decrease in T c with Y content is due to redistribution of cations and weakening of the exchange coupling constant. The magnetic phase transition has been analyzed by Arrott plot and found to have second order phase transition. The dc resistivity endorses the prepared ferrites are suitable for high frequency and high temperature magnetic device applications as well.Mg-Zn ferrite is one of the most used soft ferrites because of its high electrical resistivity, low cost, low dielectric loss, high mechanical hardness and superior environmental stability [13]. Mg-Zn ferrites with higher resistivity (10 6 -10 7 Ω cm) make its suitability in high frequency applications [13]. Most of (∼ 90%) Mg 2+ ions are located on the B-sites and small fraction (∼10%) occupies in the A-sites [14,15]. However, the Zn 2+ ions have a preference to occupy A-sites in the spinel lattice [16,17]. The Fe 3+ ions are distributed on both A-and B-sites [18]. Therefore, the physical properties of the Mg-Zn ferrites are determined by the cations distribution over the A-and B-sites. The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and le...

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“…High-energy milling did not increase iron content of the calcined powder and the Ni : Zn : Co : Fe molar ratio was 0.5 : 0. The calcination temperatures of NiZn ferrites usually vary from 800 to 1000°C, with annealing time varying from 2 to 5 h [1,[37][38][39][40][41]. The presence of un-reacted Fe 2 O 3 is observed when the solid state reactions between the oxides were not completed.…”

Section: Resultsmentioning

confidence: 99%

Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1MHz-12GHz frequency range

Othero

Santos

Barros

et al. 2021

PAC

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In this paper, NiZnCo ferrite was produced by solid state synthesis, calcination at 1000?C and sintering at 1250?C in air atmosphere. The microstructure and phases of the sintered sample were analysed by scanning electron microscopy and X-ray diffraction, respectively. The magnetic properties of the ferrite were evaluated by magnetization and magnetostriction measurements. The complex magnetic permeability and complex permittivity were also measured between 1MHz-12GHz and the reflection loss (RL) was calculated in the 100MHz-12GHz frequency range. The results show that the ferrite sample presents magnetostrictive behaviour and a saturation magnetization of 71 Am2/kg. Complex permittivity measurements indicate that the material has dielectric behaviour in the whole frequency range studied, with "? varying between 7-40, and magnetic behaviour in frequencies between 1MHz-5GHz. The minimum RL was found at frequencies between 2.4-3.3GHz and the calculated RL value for a thickness of 3mm was lower than ?10 dB in frequencies between 2.3-7.3GHz. These results indicate potential application as microwave absorber in the S band.

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Tailoring the properties of Ni-Zn-Co ferrites by Gd3+ substitution

Cited by 42 publications

References 36 publications

Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites

Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1MHz-12GHz frequency range

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