Development of Ni–Zn nanoferrite core material with improved saturation magnetization and DC resistivity

Kumar, Arun; Varma, M. Chaitanya; Dube, Charu Lata; Rao, K. H.; Kashyap, Subhash C.

doi:10.1016/j.jmmm.2008.02.129

Cited by 86 publications

(38 citation statements)

References 35 publications

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“…8) at x equal to 0.4 is argued to result for more increased spin order, thus resulting in lowered value of M s . Lower value of M s at x equal to 0.4 is also attributed [23,64,65] to lower crystallite size D witnessed from Table 2.…”

Section: Magnetic Studiesmentioning

confidence: 74%

“…Relatively lower values in nanophased ferrites are argued due to the non-collinear spin canting mechanism [63] as reported in coreshell model [23] mediated by finite size effects of nanoparticles. It is also noticed [64,65] that lowered M s values are due to the non-saturated state of the randomly distributed particles, especially when sample is reduced from bulk to nanophased structure.…”

Section: Magnetic Studiesmentioning

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: Magnetic Studiesmentioning

confidence: 74%

Section: Magnetic Studiesmentioning

confidence: 99%

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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“…З точки зору практичного застосування, такі важливі параметри, як коерцитивна сила та магнітна проникність, не є властивостями самого ферриту, а залежать, окрім хімічного складу, також від різних дефектів і полікристалічної структури, тобто від форми та розмірів зерен і пор [4][5][6].…”

Section: вступunclassified

Temperature Dependence of Initial Permeability of NixCo1-xFe2O4 Ferrite System

Bushkova

Kopayev

Bushkov

et al. 2015

PCSS

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The aim of this work was to create and study of ferrite nickel-cobalt powders, using sol-gel technology with participation of auto-combustion. Dependence of the initial permeability from the degree of substitution of cobalt cations on nickel cations is obtained. It is revealed that the crystallite size has a significant influence on the magnetic properties of the samples. With decreasing of crystallite size of nickel-cobalt ferrite Curie temperature decreases. It is shown that the smaller the particle size, the greater the thickness of the surface layer with significant violations of magnetic structure.

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“…Ferrite nanoparticles have scientific and technological importance in recent years due to their magnetic properties and wide range of applications especially when the size of the particles approaches to nanometer scale [1]. They have been used for high-frequency transformer cores, rod antennas, and radio-frequency coils [2,3]. More recently, these are also used in nano-electronic devices, high-speed integrated circuits as well as in biomedical field as contrasting agents used for magnetic resonance imaging (MRI) [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

An investigation of structural and magnetic properties of Cr–Zn ferrite nanoparticles prepared by a sol–gel process

Lakshmi¹,

Kumar

Thyagarajan

2015

J Nanostruct Chem

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Cr x Zn Fe 2-x O 4 (with x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) spinel ferrite nanoparticles have been synthesized via sol-gel method. The precursor compound was calcined at a temperature of 900°C for 3 h. The aim of this study was to investigate the effect of Cr 3? ion substitution on the structural and magnetic properties of Cr-Zn ferrite. The size, shape, and chemical state of the synthesized powders were structurally characterized by powder XRD, SEM, TEM, HRTEM, SAED, energy-dispersive X-ray analysis (EDAX), and Fourier transform infrared spectroscopy (FTIR) spectral techniques. The XRD pattern of Cr-Zn ferrite provides information about single-phase formation of spinel structure with cubic symmetry. Both crystallite size and lattice parameter decrease with increasing Cr content. Formation of spinel structure is affirmed by using FTIR and FTIR spectra which shows that the bands t1 and t2 are found to shift gradually toward the higher frequency side with substitution of Cr, which have been attributed to the decrease in the lattice constant. SEM and TEM micrographs demonstrated that nanoparticles with narrow size distribution were obtained. The average grain size was found to be in nanometer range and of the order of 43-63 nm obtained using TEM images. Compositional stoichiometry was confirmed by EDAX technique. The magnetic properties of synthesized chromium-substituted Zn ferrite nanoparticles were studied using vibrating sample magnetometer at room temperature under the applied magnetic field of 15 KG. The result indicated that the amount of Cr contents significantly influenced the crystal morphology and structural and magnetic properties of Cr-doped Zn ferrite nanoparticles.

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Development of Ni–Zn nanoferrite core material with improved saturation magnetization and DC resistivity

Cited by 86 publications

References 35 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

Temperature Dependence of Initial Permeability of NixCo1-xFe2O4 Ferrite System

An investigation of structural and magnetic properties of Cr–Zn ferrite nanoparticles prepared by a sol–gel process

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