Preparation of low–power loss MgCuZn ferrites using the microwave sintering method

Bhaskar, Ankam; Kanth, B. Rajini; Murthy, S. R.

doi:10.1023/b:jmsc.0000030739.41496.fc

Cited by 21 publications

(9 citation statements)

References 4 publications

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“…Hence, the survival of Fe 2+ ions is less likely in smallergrained samples [28,29]. Moreover, small grains in particular involve a large number of insulating thin grain boundaries, which act as scattering centers to the flow of electric charge carriers, hence, reducing the electron exchange between Fe 2+ ↔ Fe 3+ and thus, raising the resistivity [30,31]. The decrease in resistivity can be attributed to the solubility limit of Ho 3+…”

Section: Composition-dependent DC Resistivitymentioning

confidence: 99%

Correlation between ferromagnetic resonance and densification of RE substituted polycrystalline ferrites

Manzoor

Khan

Kuch

2018

Ceramics International

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We report the dopant-and size-dependent variations in high-frequency magnetic and electrical transport properties of Ho-substituted Li-Mn polycrystalline ferrites. Thermal stability and phase identification were confirmed by thermal gravimetric analysis and X-ray diffraction experiments. The overall average crystallite size decreased from 29.6 to 17.5 nm, whereas the bulk density increased from 3.47 to 4.29 g/cm 3 with increasing Ho content. Ferromagnetic resonance (FMR) measurements at the X-band revealed significant shifts in FMR linewidths and resonance positions as a function of composition. Both, FMR linewidth and porosity, were found to decrease with the systematic addition of Ho from 2538 to 2359 Oe and from 26 to 15.4%, respectively. The substitution of Ho 3+ for Fe 3+ reduced the net magnetization of the spinel lattice from 53 to 41 emu/g. Electrical measurements revealed that the resistivity is higher in samples with smaller grains possessing a greater number of thin insulating grain boundaries. The activation energy ∆E required for hopping increases from 0.09 to 0.16 eV with Ho addition, which may be well explained by the increase in resistivity. The substitution of Ho 3+ for Fe 3+ causes a decrease in Curie temperature T c due to the damping of A-B exchange interactions.

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Section: Composition-dependent DC Resistivitymentioning

confidence: 99%

Correlation between ferromagnetic resonance and densification of RE substituted polycrystalline ferrites

Manzoor

Khan

Kuch

2018

Ceramics International

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“…Smaller grains shows greater surface to volume ratio by which higher oxidation and reconversion of ions takes place. The smaller grains effect in greater number of grain boundaries, which further acts as acts as scattering center for the flow of electrons leading to rise of resistivity [10,19]. Many researchers have found the behavior of resistivity dependent on sintering conditions, temperature along with density of the samples [20][21].…”

Section: Experimental Workmentioning

confidence: 99%

Dielectric Properties of Mixed Ferrite (Mn0.4Zn0.6Fe2O4 and Co0.4Zn0.6Fe2O4) Composites

Ragini¹,

Bharadwaj²,

Burnwal³

et al. 2018

International Journal of Applied Engineering Research

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Soft ferrite (Mn0.4Zn0.6Fe2O4) and hard ferrite (Co0.4Zn0.6Fe2O4) nanocomposites (x Mn0.4Zn0.6Fe2O4 + (1-x) Co0.4Zn0.6Fe2O4 (where x= 0.25, 0.5, 0.75) were prepared with different weight percent. Crystal structures and microstructures of these composites have been investigated by using X-ray diffraction and scanning electron microscope for composite samples sintered at 900°C/30 min using microwave sintering technique. The effect of composite weight percent on dielectric properties of composites are examined over a wide frequency range (1MHz-1.8GHz) by studying the real and imaginary part of permittivity with available theories. Investigation show variation of mixed ferrites for resistivity and resonating frequency.

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“…MgCuZn ferrite is a pertinent magnetic material for applications owing to their better properties at high frequency (high resistivity, high Curie point, environmental stability and low cost) and lower densification temperature than the NiCuZn ferrites [2,3]. But in high frequency applications for Mg-based polycrystalline ferrites porosity and resistivity are the main problems which affect the magnetic performance considerably from eddy current generation.…”

Section: Introductionmentioning

confidence: 99%

Complex permeability spectra of PbO and Ta2O5 added nanocrystalline MgCuZn ferrites

Raju

2015

Journal of Magnetism and Magnetic Materials

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Preparation of low–power loss MgCuZn ferrites using the microwave sintering method

Cited by 21 publications

References 4 publications

Correlation between ferromagnetic resonance and densification of RE substituted polycrystalline ferrites

Correlation between ferromagnetic resonance and densification of RE substituted polycrystalline ferrites

Dielectric Properties of Mixed Ferrite (Mn0.4Zn0.6Fe2O4 and Co0.4Zn0.6Fe2O4) Composites

Complex permeability spectra of PbO and Ta2O5 added nanocrystalline MgCuZn ferrites

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