Effect of sintering enclosures and sintering parameters on the magnetic properties of a high permeability manganese-zinc ferrite

Kilbride, I.P.; Freer, Robert

doi:10.1109/20.822550

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…Imperfections can pin domain walls, which therefore, require higher activation energy to detach. Impurities and very rapid cooling of ferrites can cause stresses in the microstructure …”

Section: Factors Influencing Initial Permeabilitymentioning

confidence: 99%

“…This is attributed to nonuniform grain growth and partial binder burnout. The formation of a duplex microstructure frequently leaves entrapped porosity which limits domain size and domain boundary movement . Sintering increases initial permeability due to increase in density and grain size with sintering temperature.…”

Section: Factors Influencing Initial Permeabilitymentioning

confidence: 99%

“…Impurities and very rapid cooling of ferrites can cause stresses in the microstructure. 31 Duplex structure forms when smaller grains encapsulate larger grains. This is attributed to nonuniform grain growth and partial binder burnout.…”

Section: Factors Influencing Initial Permeabilitymentioning

confidence: 99%

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Engineering High Permeability:Mn–Zn andNi–Zn Ferrites

Kumar¹,

Shinde

Vasambekar

2014

Int J Applied Ceramic Tech

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Magnetic properties of polycrystalline spinel ferrites are of significant interest in scientific community. Of all, initial permeability is most important magnetic property for device fabrication. Mn-Zn and Ni-Zn ferrites are commercially most successful class of ferrites. Ferrites accommodate variety of cations in interstitial sites; type of cations, their occupancy at interstitial sites, grain size, pores, defects, or other imperfections in ferrites regulate their response to external magnetic stimulus. These factors are influenced by composition and preparation method. The failure of initial permeability of ferrites, to withstand variation in frequency of applied signal has fueled intense efforts in scientific community to optimize frequency stability of permeability. Therefore, improvement in their permeability is important from commercial perspective, and it further enables deeper insight into the dynamical link between microstructure and magnetic properties. This work presents a review of initial permeability in Mn-Zn and Ni-Zn ferrites with a focus on influence of intrinsic factors and frequency of applied signal. The work is an analytical assessment to provide framework for engineering high permeability in ferrites.

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“…Imperfections can pin domain walls, which therefore, require higher activation energy to detach. Impurities and very rapid cooling of ferrites can cause stresses in the microstructure …”

Section: Factors Influencing Initial Permeabilitymentioning

confidence: 99%

Section: Factors Influencing Initial Permeabilitymentioning

confidence: 99%

See 1 more Smart Citation

Engineering High Permeability:Mn–Zn andNi–Zn Ferrites

Kumar¹,

Shinde

Vasambekar

2014

Int J Applied Ceramic Tech

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“…For detailed investigations, the top and bottom toroid in each column was discarded since they may not be representative, because of elemental losses from the outermost surfaces of the stack. 13 Densities of the sintered products were determined by an Archimedes method. Initial x-ray diffraction analysis, and verification of the phases present, was carried out on polished cross sections of the ferrite toroids, using a Philips PW3020 diffractometer with Cu K␣ radiation; the scan range was 10°-120°at a rate of 0.02°min −1 .…”

Section: A Sample Preparation and Characterizationmentioning

confidence: 99%

Direct correlation between ferrite microstructure and electrical resistivity

Cernik

Freer

Leach

et al. 2007

Journal of Applied Physics

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Variations in the composition and microstructure of Mn-Zn soft ferrites have been directly correlated with spatial variations in electrical resistivity, which were both observed to occur on a length scale of approximately 500 μm. Tomographic energy dispersive diffraction imaging (TEDDI) was used to determine the nonsystematic change in the lattice parameter across the sample volume (8.48±0.05 Å) at a spatial resolution of 50 μm. We have used a microprobe contact technique to measure the local electrical resistivity (∼35 Ω cm) and density functional theory to model the band structure. The band structure calculations directly utilized the experimentally measured lattice parameters from the TEDDI measurements and were in good agreement with the measured resistivity. The mean band gap shrinkage was found to be 0.02 eV. This value for Eg was found to account well for the observed 10−20 Ω cm resistivity variations.

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“…Besides the basic composition and sintering process [1][2][3], addition performs vitally here for it influences the losses of MnZn ferrites significantly.…”

Section: Introductionmentioning

confidence: 99%