Effects of sintering atmosphere and temperature on structural and magnetic properties of Ni-Cu-Zn ferrite nano-particles: Magnetic enhancement by a reducing atmosphere

Gholizadeh, Ahmad; Jafari, Elahe

doi:10.1016/j.jmmm.2016.09.029

Cited by 128 publications

(34 citation statements)

References 25 publications

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“…Furthermore, sintering atmosphere is also responsible in altering the magnetic properties and the effects can be observed in cation redistribution and oxygen deficiency [21]. The sintering time displays in Table 1, which shows that the non-conventional technique requires much shorter sintering time as compare to conventional technique.…”

Section: Sintering Of Ferrite Materialsmentioning

confidence: 99%

“…Yet most of the techniques still require sintering, although at relatively lower temperatures to produce a single phase material. The sintering temperature could be as low as 200°C [21], though displaying least performance of magnetic properties compare to much higher sintering temperatures. Highest sintering temperature is normally employed for synthesizing bulk ferrites via solid state reaction and has been shown to produce optimum magnetic properties (see Table 1).…”

Section: Sintering Of Ferrite Materialsmentioning

confidence: 99%

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Evolution of Magnetic Properties in Ferrites: Trends of Single- Sample and Multi-Sample Sintering

Ismail¹,

Ibrahim²,

Nazlan³

2018

Sintering of Functional Materials

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Microstructure of magnetic materials greatly influences the performance of magnetic properties, and sintering has been used as an agent to tailor the microstructure of these magnetic materials especially ferrites. Nanostructured ferrites prepared by high-energy milling method are often inherently unstable owing to their small constituent sizes, nonequilibrium cation distribution, disordered spin configuration, and high chemical activity. Therefore, sintering of the milled ferrites recrystallizes the nanostructure and causes its transition from an excited metastable (activated) state into the low-energy crystalline state. A better understanding of the response of nanoscale ferrites with changes in temperature is crucial not only for basic science (the development of an atomistic and microscopic theory of the mechanochemical processes) but also because of the technological high-temperature applications in catalysis, ferrofluids and information storage. This chapter discusses on two different sintering schemes, which are a commonly applied multi-sample sintering and a rarely adopted single-sample sintering. Experimental results of single-sample and multi-sample sintering of NiZn ferrites and yttrium iron garnet (YIG) were highlighted, and their microstructural consequences on the magnetic properties were also discussed.

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Section: Sintering Of Ferrite Materialsmentioning

confidence: 99%

Section: Sintering Of Ferrite Materialsmentioning

confidence: 99%

Evolution of Magnetic Properties in Ferrites: Trends of Single- Sample and Multi-Sample Sintering

Ismail¹,

Ibrahim²,

Nazlan³

2018

Sintering of Functional Materials

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“…For the composition x = 0.035, there may be possibility of increasing the concentration of Fe 2+ ions during the synthesis process, and therefore, Mr is higher as compared to compositions x = 0.015 and 0.025. It is also seen that Mr and H c of La 3+ -substituted Ni-Cu-Zn ferrites are lower than pure Ni-Cu-Zn ferrite [39,40]. The squareness ratio (R), magnetic moment (η B ), and anisotropy constant (k 1 ) for all compositions were calculated using the relations [34]:…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Effect of La3+ substitution on structural and magnetic parameters of Ni–Cu–Zn nano-ferrites

et al. 2019

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The ferrite material with compositions Ni 0.7 Cu 0.1 Zn 0.2 La x Fe 2−x O 4 (where x = 0, 0.015, 0.025, and 0.035) was synthesized by oxalate co-precipitation method. The ferrite samples were characterized by thermo-gravimetric and differential temperature analysis (TG-DTA), energy-dispersive X-ray analysis (EDAX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), and vibrating sample magnetometer (VSM) techniques. The EDAX analysis confirmed the formation of required stoichiometric ferrite samples. The formation of cubic spinel structure with the presence of weak ortho-ferrite phases was confirmed from X-ray diffraction analysis. The lattice constant of all the ferrites was found to be increase with increase in La 3+ content. The presence of main two recognized strong absorption bands in the frequency range 400-600 cm −1 in the FTIR spectra shows the formation of well spinel ferrite. Morphological study shows that grain size of the ferrites lies in the range 16.23-24.21 nm. It is observed that the saturation magnetization and magnetic moment of Ni-Cu-Zn ferrites decrease with La 3+ content.

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“…The tetrahedral (A) and octahedral (B) sites are surrounded by 4 and 6 oxygen ions, respectively. Electrical and magnetic properties of ferrites are dependent on cationic distribution, composition, and nature of impurity ions in the material [4]; the structural properties of ferrites are dependent on compositions and synthesis methods [5]. The growth of grains is in uenced by grains' boundary mobility.…”

Section: Introductionmentioning

confidence: 99%

“…Recrystallization and the growth of grains cause the movement of grain boundaries and the increase in initial permeability [6]. To improve the electronic and magnetic properties of ferrites numerous divalent cations, such as chromium, copper, manganese, and zinc, substitute on ferrites [4]. The auto combustion method in comparison with others is more acceptable for synthesizing ferrites due to the high sintering, homogenous particle size distribution, and lower time consumed [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of zinc, magnesium, and copper substitutions on the initial permeability of nickel ferrite

Shafiee¹,

Arab²,

Riahi-Nouri³

2020

Preprint

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Zinc, magnesium, and copper substituted nickel spinel ferrite were synthesized in the form of Ni1 − x (Zn06Mg0.2Cu0.2) x Fe2O4 (where x = 0.0, 0.3, 0.5 and 0.7) via auto combustion method. The effect of the presence of these dopants on the average of crystallite, average particle size, the lattice constant, morphology, initial permeability, and magnetization of the synthesized ferrites was investigated. The structural properties, morphology, and magnetic properties were characterized via X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), LCR meter and alternative gradient force magnetometer (AGFM). XRD study shows the formation of a single-phase cubic spinel structure. Also, the average crystallite size was found to increase from 6 nm to 11 nm with increasing the Zn2+, Mg2+, and Cu2+ doping ratio from 0.0 to 0.7. Moreover, FE-SEM results were indicated the presence of nanosized spherical shape of prepared particles with agglomeration. The lattice constant and the particle size were found to increase with the increase in Zinc, magnesium, and copper. The values of initial permeability and magnetization were increased to a maximum value of 76 H/M and 71.37 emu/g for x = 0.7 sample. Furthermore, coercivity was found to decrease with increasing Zinc, magnesium, and copper concentration, which is useful for power applications. The variations of initial permeability and magnetization as a function of average particle size were discussed and were compared with previous works. The results were indicated the increase in initial permeability and magnetization with the enhancement of average particle size. The constancy in permeability throughout the frequency range studied from 10 kHz to1 MHz was indicated the compositional stability and quality of the samples. The results were indicated that the ferrites with high initial permeability can be an excellent choice as magnetic cores.

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Effects of sintering atmosphere and temperature on structural and magnetic properties of Ni-Cu-Zn ferrite nano-particles: Magnetic enhancement by a reducing atmosphere

Cited by 128 publications

References 25 publications

Evolution of Magnetic Properties in Ferrites: Trends of Single- Sample and Multi-Sample Sintering

Evolution of Magnetic Properties in Ferrites: Trends of Single- Sample and Multi-Sample Sintering

Effect of La3+ substitution on structural and magnetic parameters of Ni–Cu–Zn nano-ferrites

Effect of zinc, magnesium, and copper substitutions on the initial permeability of nickel ferrite

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