Separation of susceptibility mechanisms for ferrites of low anisotropy

Globus, A.; Duplex, P.

doi:10.1109/tmag.1966.1065867

Cited by 108 publications

(25 citation statements)

References 4 publications

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“…and thereafter decrease. According to Globus equation [26], the permeability due to the wall motion is likely to be linearly dependent on the grain size which is given by…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

et al. 2012

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Cu-Zn ferrites of composition Cu 1-x Zn x Fe 2 O 4 were prepared by double sintering ceramic technique at 950 0 C and 1050 0 C for 3 hours and 2 hours, respectively. Structural and magnetic properties of the Cu-Zn ferrites were investigated by using X-ray diffraction, microstructure study and complex permeability behaviour. X-ray analysis indicated the formation of single-phase cubic spinel structure for all samples. The lattice parameter was found to increase with increasing Zn content obeying Vegard's law. The X-ray and bulk densities of the Cu-Zn ferrite significantly decreased whereas porosity increased with increasing Zn concentration. Micrographs exhibited decrease in grain size with increasing concentrations. The real part μ'of initial permeability remained constant up to certain lower range of frequency after which it decreased to lower value of permeability. μ' increased with increasing Zn contents up to x = 0.5, after that it decreased with higher Zn content but was also found to increase with sintering temperature. The possible reasons responsible for change in structural, microstructural and complex permeability with increasing of nonmagnetic Zn 2+ ion are ascertained.

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“…and thereafter decrease. According to Globus equation [26], the permeability due to the wall motion is likely to be linearly dependent on the grain size which is given by…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

et al. 2012

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“…Beyond this peak, permeability sharply falls to a very low value indicating T C . The sharp fall of the permeability at the Curie point indicates the degree of homogeneity in the sample composition [32]. From the curves of the initial permeability versus temperature, it can be seen that for samples up to x = 0.3, a second broadening peak (hump shape) other than the Hopkinson peak is found which may be attributed to structural transformation from tetragonal to cubic in these samples [33,34].…”

Section: Temperature Dependence Of Initial Permeabilitymentioning

confidence: 99%

Structural phase transformation and hysteresis behavior of Cu-Zn ferrites

2013

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A series of Cu 1-x Zn x Fe 2 O 4 ferrite (with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) compositions were synthesized using the standard solid-state reaction technique. X-ray diffraction was used to study the structure of the above investigated samples. The theoretical and experimental lattice parameters (a th and a exp ) were calculated for each composition. A significant decrease in density and subsequent increase in porosity were observed with increasing Zn content. Curie temperature, T C , has been determined from the temperature dependence of permeability and found to decrease with increasing Zn content. The anomaly observed in the temperature dependence of permeability was attributed to the existence of two structural phases: cubic phase and tetragonal phase. Low-field hysteresis measurements have been performed using a B-H loop trace from which hysteresis parameters have been determined. Coercivity and hysteresis loss were estimated with different Zn contents.

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“…This mixed spinal formula AB 2 O 4 has tetrahedral (A) sites which are occupied by Zn 2+ and Fe 3+ ions whereas octahedral (B) sites are occupied by Ni 2+ and Fe 3+ ions. Magnetic properties of NiZn ferrites rely heavily on the chemical composition and are also sensitive to their microstructure [1,2] . There are a few factors that determine the microstructure of ferrites such as the quality of raw materials, the calcinations temperature, the milling procedure and the sintering regime [3] .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Milling Time on Ni0.5Zn0.5Fe2O4 Compositional Evolution and Particle Size Distribution

Ismayadi¹,

Hashim²,

Khamirul³

et al. 2009

American J. of Applied Sciences

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Problem statement:This study involved an investigation to ascertain the diffusion of NiO and ZnO into the tetrahedral and octahedral sites using mechanical alloying method. The effect of mechanical alloying towards particle size was also reported. Approach: NiO, ZnO and Fe 2 O 3 precursors were mechanically alloyed to synthesis ultrafine powders of Ni 0.5 Zn 0.5 Fe 2 O 4 . Various milling times were employed to study the effect of milling time on the materials. The ultrafine powder was sampled after each milling time and further characterized using XRD to investigate the phases of the powder and the crystallite size, SEM for the morphology and TEM for particle size investigation. Results: The XRD spectra indicated the precursors reacted during milling with the diffusion of ZnO and followed by NiO into their respective crystallographic sites. SEM micrographs showed the agglomeration of powders due to high energy milling and TEM images proved the particles of the materials were of nanosize. Conclusion: It was concluded that samples prepared using mechanical alloying technique appear to be a potential method for large production due to the possible reduction of cost and also reduction of particle size against milling time.

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Separation of susceptibility mechanisms for ferrites of low anisotropy

Cited by 108 publications

References 4 publications

Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

Structural phase transformation and hysteresis behavior of Cu-Zn ferrites

The Effect of Milling Time on Ni0.5Zn0.5Fe2O4 Compositional Evolution and Particle Size Distribution

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