The role of iron ions on microstructural and magnetic properties of MgCuZn ferrites prepared by sol-gel auto-combustion process

Bahiraei, Hamed; Ong, C. K.

doi:10.1016/j.materresbull.2018.11.026

Cited by 11 publications

(3 citation statements)

References 26 publications

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“…The composite (Mg 0.3 Cu 0.2 Zn 0.5 O) (Fe 2 O 3 ) was synthesized using the sol-gel method. The description of experimental procedure is explained in detail in previous publications [13,14]. Briefly, according to the compositional formula, 0.02 mol solution of Mg(NO 3 ) 2 ÁH 2 O, Cu(NO 3 ) 2 Á3H 2 O, Zn(NO 3 ) 3 Á4H 2 O, Fe(NO 3 ) 3 Á9H 2 O, were prepared and mixed under constant stirring for 1 h. Then, citric acid with a molar ratio of metal salts as 1:1 was added into the above solution, and with ammonia the pH value of mixtures adjusted to 7.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Influence of MoO3 additive on grain growth and magnetic properties of Mg0.3Cu0.2Zn0.5Fe2O4 ceramics sintered at low temperature

Bahiraei

Ong

2021

J Mater Sci: Mater Electron

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In this research paper, microstructural, electromagnetic properties, and thermal stability, of (Mg 0.3 Cu 0.2 Zn 0.5 O) (Fe 2 O 3 ) ceramics were adjusted by using lowmelting point molybdenum trioxide (MoO 3 ) as additive. The required ferrite powders were synthesized through a cost-effective sol-gel method. The ferrite ceramics with high density and high permeability were prepared, using various content of MoO 3 (from 0.00 to 1.00 wt%) at low sintering temperature. Results indicate that MoO 3 not only improves density and grain growth of ferrite samples, but also effectively tailors the saturation magnetization (M s ), coercive field strength (H c ), initial permeability (l i ), and Curie temperature (T C ). For a qualitative comparison, the SEM images of both surface and fracture surface of the specimens were obtained. The results indicate that 0.25 wt% MoO 3 can promote grain growth, densification and uniformity, and reduce pores between grains of the sintered sample. In particular, MgCuZn ferrite with high bulk density (q = 4.7 g/cm 3 ), high initial permeability (l 0 = 460), high saturation magnetization (M s = 50.6 emu/g), and low coercivity (H c = 1.4 Oe) are obtained when the content of additive is 0.25 wt%. However, the excessive amount of MoO 3 deteriorates the grain size uniformity and weakens the magnetic properties due to the production of non-magnetic MoO 3 liquid phase.

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Section: Experimental Methodsmentioning

confidence: 99%

“…(68 pm) can enter into the lattice of ferrite and decreases the lattice parameters during sintering process (Table .1). The average crystallite size of the samples, estimated by Debye-Scherrer formula [13], was found to be in the range of 57-72 nm.…”

Section: Structural Studymentioning

confidence: 98%

Influence of MoO3 additive on grain growth and magnetic properties of Mg0.3Cu0.2Zn0.5Fe2O4 ceramics sintered at low temperature

Bahiraei

Ong

2021

J Mater Sci: Mater Electron

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“…In recent years, spinel Mg ferrites have been researched in many applying fields, for example, biology, energy storage, semiconductor industry and so on 24,25,26,27,28 . Meanwhile, Mg ferrites have application potential in antenna substrate due to their physical and chemical stability, soft magnetic characteristics, which enable them be suitable for antenna design and fabricating 29,30,31,32 . The effect of temperature on magnetic and dielectric behaviors of various kinds of ferrites have been deeply investigated to achieve specific function 33,34,35,36 .…”

Section: Introductionmentioning

confidence: 99%

Temperature tailored magneto-dielectric properties of Cd-substituting Mg-based ferrite ceramics for miniaturized VHF antennas

Gan

2023

Sixth International Conference on Intelligent Computing, Communication, and Devices (ICCD 2023)

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The microstructure formation and structural regulation of Mg-Cd ferrites (Cd0.15Mg0.85Fe2O4) with 5% Bi2O3 addition at different sintering temperatures (880, 900, 920, and 940 °C) werer invsetigated for application in VHF antennas. The changes including microstructure, phase composition, magnetic and dielectric properties were mainly characterized. It was found that increasing temperature resulted in superior microstructure with accrescent grain size and denser arrangement. XRD patterns revealed normal spinel phase and a secondary phase of Bi compound. Meanwhile, a reinforcement of the magnetization including increased saturation magnetization (from 37.8 to 46.6 emu/g) and dropped coercivity (from 98.2 to 65.9 Oe) were obtained through hysteresis loops. A slight increment of μ' and ' were measured over a broad frequency range in VHF bands. Therefore, excellent magneto-dielectric properties of the proposed ferrites were obtained. In addition, low magnetic losses (tan δμ ~10 -2) and dielectric losses (tan δμ ~10 -3) indicating low power loss in operation. It is foreseeable that these properties of the proposed ferrites would behave well in miniaturized VHF antennas.

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Combustion Synthesis of Porous NiCuZn Spinel Ferrite Hierarchies and Their Magnetic Properties

Chen,

Qian,

Zhang

et al. 2023

ChemistrySelect

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Nickel‐copper‐zinc (NiCuZn) spinel ferrites have attracted intensive research owing to their unique magnetic properties and low co‐fire temperature. Combustion synthesis has been viewed as a promising protocol for the large‐scale fabrication of NiCuZn spinel ferrites. However, the spinel ferrites prepared by this method usually suffer from limited saturation magnetization and high coercivity due to their large size, which will impose detrimental harmonics on electrical equipment (e. g., transformer, motor, etc.). To address these issues, highly porous NiCuZn spinel ferrite hierarchies were prepared within several hours through a modified solution combustion method, using glucose and ammonium nitrate as the fuel and combustion enhancer, respectively. The as‐obtained NiCuZn spinel ferrite hierarchies show excellent magnetic properties with a high saturation magnetization up to 62.61 emu/g and a low coercivity of 9.6 Oe thanks to the rational distribution of cations and grain size. More importantly, this method also allows various modifications (heteroatom doping) and large‐scale applications, which may be promising for the fabrication of high‐performance soft magnets for electrical equipment.

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The role of iron ions on microstructural and magnetic properties of MgCuZn ferrites prepared by sol-gel auto-combustion process

Cited by 11 publications

References 26 publications

Influence of MoO3 additive on grain growth and magnetic properties of Mg0.3Cu0.2Zn0.5Fe2O4 ceramics sintered at low temperature

Influence of MoO3 additive on grain growth and magnetic properties of Mg0.3Cu0.2Zn0.5Fe2O4 ceramics sintered at low temperature

Temperature tailored magneto-dielectric properties of Cd-substituting Mg-based ferrite ceramics for miniaturized VHF antennas

Combustion Synthesis of Porous NiCuZn Spinel Ferrite Hierarchies and Their Magnetic Properties

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