Synthesis and magnetic characterization of Zn0.7Ni0.3Fe2O4 nanoparticles via microwave-assisted combustion route

Sertkol, M.; Köseoğlu, Yüksel; Baykal, A.; Kavas, H.; Toprak, Muhammet S.

doi:10.1016/j.jmmm.2009.11.018

Cited by 122 publications

(38 citation statements)

References 53 publications

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“…A comparative analysis is carried out on the M s and H c values reported [11][12][13][14][15] in other ferrite systems. Occurrence of SPM in nanophased Ni-Zn ferrites (for D equal to 1.93 nm) is reported [10] with M s * 4.5 emu/gm and H c * 1.7 Oe.…”

Section: Occurrence Of Superparamagnetismmentioning

confidence: 99%

“…The dielectric parameters are estimated (Eqs. [8][9][10][11][12][13][14] from the experimental data. Their trends and the underlying mechanism are discussed in the following sub-sections.…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…Ni-Zn ferrites exist in mixed spinel [14] structure, in which tetrahedral (T d or A-sites) are occupied by Zn 2? and Fe 3? ions; and octahedral O h (or B-sites) are occupied by Ni 2?…”

Section: Introductionmentioning

confidence: 99%

“…and Fe 3? ions. Ni-Zn bulk ferrites exhibit high electrical resistivity (q) and are known to be selective materials [14] for high-frequency applications. The performance of these ferrites is found [15] to be improved by doping with selective cations and grown in ultra-fine particle state.…”

Section: Introductionmentioning

confidence: 99%

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Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Lakshmi¹,

Sridhar

Govindraj

et al. 2016

J Mater Sci

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Structural, morphological, magnetic, and dielectric investigations are carried out in Nb-doped (viz., for x equal to 0.0-0.4 by wt%) nanocrystalline Ni-Zn ferrites synthesized by hydrothermal method. XRD, IR studies infer the growth of nano structures and Fe 2 O 3 phase. Nb ions segregate at grain boundaries. Crystallite size (D) varies from 62 to 18 nm with x. FTIR absorption exhibits split at higher x. Saturation magnetization witnesses an overall decrease with x. Trends of M s (x) are explained by nature of dopant, preferential replacement, surface canting (Y-K angles) and lattice contraction. Variations of coercive field (H c ) and D infer singledomain to multi-domain morphological transformation. Occurrence of superparamagnetism (SPM) is predicted for zeroed values of H c and for a critical concentration x crit equal to 0.321. Enhanced Nb 5? -Fe 2? binding with dopant (x up to 0.2) results for decrease in dielectric constant e 0 r , loss factor tand and increase in resistivity q. Lowered ac conductivity is attributed to blockade of path by Nb 5? ions in the vicinity of B-sites. Relatively higher q (*10 8 X cm) and lower loss (tand *10 -2 -10 -3 ) evinced for 10 kHz. Enhanced core loss is realized with x manifested as lowered H c and tand to usher their utility in high-frequency applications.

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Section: Occurrence Of Superparamagnetismmentioning

confidence: 99%

“…The dielectric parameters are estimated (Eqs. [8][9][10][11][12][13][14] from the experimental data. Their trends and the underlying mechanism are discussed in the following sub-sections.…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…Ni-Zn ferrites exist in mixed spinel [14] structure, in which tetrahedral (T d or A-sites) are occupied by Zn 2? and Fe 3? ions; and octahedral O h (or B-sites) are occupied by Ni 2?…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Lakshmi¹,

Sridhar

Govindraj

et al. 2016

J Mater Sci

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“…The internal heating initiates the ignition in the center of the sample during the microwave-assisted combustion synthesis and propagates rapidly outward [13][14][15]. Under suitable processing condition, the combustion wave can be easily controlled compared with the conventional selfpropagation combustion synthesis [15].…”

Section: Introductionmentioning

confidence: 99%

MnCrxFe2−xO4 Nanoparticles: Magnetic and Microwave Absorption Properties

Baykal

Genç

Elmal

et al. 2015

J Inorg Organomet Polym

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Chromium substituted Mn nanospinel ferrites having the formula MnCr x Fe 2-x O 4 (0.0 B x B 1.0) have been synthesized using the microwave-assisted combustion synthesis. The composition, structural, spectroscopic features of the products were studied by X-ray powder diffractometry (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. XRD investigations indicated the formation of single-phased cubic spinel structure for all products. Lattice parameters of the products represented the continuous decrease with increasing the substitution of Cr 3? . The saturation magnetization of undoped sample appeared to be highest and as Cr 3? concentration increases magnetization of the samples decreases. There is one reflection loss minimum in all doped samples at around 13 GHz with magnitude of -12 dB mechanism of which is explained by quarter wave cancellation model.

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Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co_0.5Ni_0.5FeCrO₄ Magnetic Spinel Nanoparticles for Effective H₂/CO₂ and O₂/N₂ Gas Separation

Ashtiani

Azadmanjiri

Hong

et al. 2022

Adv Materials Inter

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Gas separation matrix membranes (MMMs) benefit from a combination of a polymer matrix and heterogeneous solid or liquid (nano) additives. However, improvements in mechanical strength of membrane permeability or gas selectivity are often overbalanced by morphological deficiencies, such as aggregation or sedimentation of the nanofiller, due to poor control at the nano level. Here, the controlled orthogonal magnetic field deposition of self‐invented spinel Co0.5Ni0.5FeCrO4 magnetic nanoparticles (SMNPs) into the cellulose triacetate (CTA) results in well‐defined gas transport pathways in the membrane and enhances gas separation performances by expanding the effective‐selective surface area. Contrariwise, the structural observation of the fabricated MMMs in the absence of the magnetic field shows precipitation and aggregation of the particles at the bottom of the membrane. The permeability and selectivity of the H2/CO2 and O2/N2 gas pairs surpass the 2008 and 2015 Robeson upper bounds for the controlled embedding of the SMNPs series (up to 15 wt.%) while the neat CTA or MMM with a random non‐controlled SMNPs distribution exhibits substantially lower permeability and selectivity values. This work contributes to the development of magnetic field casting as a facile technique that advances the gas transport properties of MMMs, efficient for air separation.

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Synthesis and magnetic characterization of Zn0.7Ni0.3Fe2O4 nanoparticles via microwave-assisted combustion route

Cited by 122 publications

References 53 publications

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

MnCrxFe2−xO4 Nanoparticles: Magnetic and Microwave Absorption Properties

Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co_0.5Ni_0.5FeCrO₄ Magnetic Spinel Nanoparticles for Effective H₂/CO₂ and O₂/N₂ Gas Separation

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Synthesis and magnetic characterization of Zn0.7Ni0.3Fe2O4 nanoparticles via microwave-assisted combustion route

Cited by 122 publications

References 53 publications

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

Experimental characterization of nanocrystalline niobium-doped nickel–zinc ferrites: occurrence of superparamagnetism

MnCrxFe2−xO4 Nanoparticles: Magnetic and Microwave Absorption Properties

Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co0.5Ni0.5FeCrO4 Magnetic Spinel Nanoparticles for Effective H2/CO2 and O2/N2 Gas Separation

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Product

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Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co_0.5Ni_0.5FeCrO₄ Magnetic Spinel Nanoparticles for Effective H₂/CO₂ and O₂/N₂ Gas Separation