The improved saturation magnetization and initial permeability in Mn–NiZn ferrites after cooling in vacuum

Zhou, Xueyun; Wang, Jun; Li-ling, Zhou; Yao, Dongsheng

doi:10.1007/s00339-022-05422-2

Cited by 16 publications

(4 citation statements)

References 27 publications

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“…In Mn-doped NiFe 2 O 4 , with regarding MnFe 2 O 4 as partial inverse spinel ferrite with 80% Mn 2+ at tetrahedral and 20% Mn 2+ at octahedral sites, because of larger ionic radius of Mn 2+ (0.66 Å) to Fe 2+ (0.49 Å) ions at A sites and larger ionic radius of Mn 2+ (0.83 Å) to Ni 2+ (0.69 Å) ions at B sites of inverse spinel NiFe 2 O 4 , the lattice parameter increased, and the unit cell can be expanded. Also, in the Zn-doped NiFe 2 O 4 , the Zn 2+ ions have a preference to present in the tetrahedral sites with larger ionic radius (0.65 Å) to Fe 2+ (0.49 Å) ions in A sublattice hence the lattice constant in ZNFO can be larger than NFO 29 , 30 . The amount of x-ray density (ρ x ) is estimated by the following relation: where M is the molecular weight, Z = 8 is the number of molecules per unit cell, and N = 6.022 × 10 23 (atoms/mol) is the Avogadro number.…”

Section: Resultsmentioning

confidence: 99%

“…Bulk NiFe 2 O 4 has an inverse spinel structure, however, in the nano-sized NiFe 2 O 4 , the spinel structure can have a mixed spinel structure for the size smaller than a few nm or by doping 11 that in this structure, divalent cations distributed in both A and B sites [Fe x 3+ M 1-x 2+ ] A [M x 2+ Fe 2-x 3+ ] B O 4 . In the ZNFO structure, Zn 2+ ions strongly prefer to be in the tetrahedral site of NiFe 2 O 4 structure and caused mixed spinel structure, so this can cause disorder in the favorable Fe 3+ ions site in tetrahedral sublattice and this excluded the growth of grains 16 , 30 . Second, it can be related to the complete electronic configuration of the Zn 2+ ion (3d 10 ) and lake of interaction electrons that resulted in fewer interactions with its ligands and oxygen ions, so crystallite size decreased.…”

Section: Resultsmentioning

confidence: 99%

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Study of Urbach energy and Kramers–Kronig on Mn and Zn doped NiFe2O4 ferrite nanopowder for the determination of structural and optical characteristics

Nazari,

Golzan,

Mabhouti

2024

Sci Rep

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MxNi1-xFe2O4 spinel ferrite (M = Mn, Zn, and x = 0, 0.05) has been successfully synthesized by co-precipitation technique with hydrazine hydrate reduction agent (instead of NaOH) and Ethylene glycol surfactant. The XRD spectra of the samples illustrated high crystallinity. The structural characterization of pure and doped fcc NiFe2O4 were calculated by Scherrer, Modified Scherrer, Williamson–Hall, and SSP methods. In comparison of several methods, the Scherrer method is unreasonable method and W–H method has an acceptable range and can calculate both < L > and strain without restriction. The specific surface area in Zn-doped increased, demonstrate increment of adsorption properties in Ni ferrite structure. TEM images revealed the shape of grains is spherical, cubic, and irregular, with a grain size in the range of 35–65 nm. Hysteresis loops illustrated the magnetic behavior of samples. From the reflectance data, the band gap energies were estimated at 1.984, 1.954, and 1.973 eV for un-doped, Mn, and Zn-doped NiFe2O4 respectively (red shift). The almost low value of Urbach energy for pure, Mn, and Zn -doped NiFe2O4 indicates low structural disorder, which can approve the high crystallinity of samples. Direct band gap energy (Eg), refractive index, and extinction coefficient were estimated by the Kramers–Kronig method with linear optical evaluations. The Eg by K-K method is in good agreement with the Eg by Kubelka–Munk function.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Study of Urbach energy and Kramers–Kronig on Mn and Zn doped NiFe2O4 ferrite nanopowder for the determination of structural and optical characteristics

Nazari,

Golzan,

Mabhouti

2024

Sci Rep

View full text Add to dashboard Cite

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“…M S is observed to increase with a smaller amount of Mn substitution and then decrease with further Mn content rise. Magnetic contributions from local moments, superexchange interactions, and spin-canting among cations between A-A, A-B, and B–B sites are responsible for the behavior. , Additionally, Curie temperature for Mn-doped Ni–Zn ferrite samples is reported as high as ∼600 K suggesting ferrimagnetic properties remain up to that temperature …”

Section: Resultsmentioning

confidence: 99%

All-Around Electromagnetic Wave Absorber Based on Ni–Zn Ferrite

Mandal,

Bhandari,

Mullurkara

et al. 2024

ACS Appl. Mater. Interfaces

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Exploring a convenient, scalable, yet effective broadband electromagnetic wave absorber (EMA) in the gigahertz (GHz) region is of high interest today to quench its expanding demand. Ni−Zn ferrite is considered as a potential EMA; however, their performance study as a scalable effective millimeter-length absorber is still limited. Herein, we investigated EM wave attenuation properties of Ni 0.5 Zn 0.5 Fe 2 O 4 (NZF) samples substituting Mn ion in place of Fe 3+ as well as Zn 2+ within a widely used frequency range of 0.1−9 GHz. Through composition optimization, Ni 0.5 Zn 0.4 Mn 0.1 Fe 2 O 4 (NZM0.1F) EMA demonstrates excellent microwave absorption performance accompanied by simultaneous maximum reflection loss (RL) of −50.2 dB and wide BW of 6.8 GHz (with RL < −10 dB, i.e., attenuation >90%) at an optimum thickness of 6 mm. Moreover, the attenuation constant significantly increases from ∼217 to 301 Np/m with Mn doping. The key contribution arises from magnetic− dielectric properties synergy along with enhanced dielectric and magnetic losses owing to cation chemistry and site occupation in spinel NZF. In addition, porosity is induced in the system by a controlled two-step heat treatment process that promotes total loss with multiple internal reflections of the EM wave. Furthermore, RL is simulated by varying incident EM wave angles for the NZM0.1F sample displaying its angle insensitivity up to 50°. Our results reveal NZM0.1F as a futuristic environment-friendly microwave absorber material that is suitable for practical high-frequency applications.

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“…A precise analysis of magnetic losses is crucial in developing MnZn ferrite cores that exhibit lower losses at these frequencies. The trend towards miniaturization in electronic devices also brings to the fore the issue of heat accumulation and temperature rises, making loss reduction at a wide range of temperatures increasingly relevant [21,22]. This study aims to address these challenges, focusing on reducing the magnetic losses in MnZn ferrite cores within the 100 kHz to 1 MHz range, which is pivotal for the next generation of high-frequency power supplies.…”

Section: Introductionmentioning

confidence: 99%

Contribution of Magnetization Mechanisms in MnZn Ferrites with Different Grain Sizes and Sintering Densification

Liu,

Liao,

et al. 2024

Coatings

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This study investigates the magnetization mechanisms in MnZn ferrites, which are key materials in high-frequency power electronics, to understand their behavior under various sintering conditions. Employing X-ray diffraction and scanning electron microscopy, we analyzed the microstructure and phase purity of ferrites sintered at different temperatures. Our findings confirm consistent spinel structures and highlight significant grain-growth and densification variabilities. Magnetic properties, particularly the saturation magnetization (Ms) and initial permeability (μi), were explored, revealing their direct correlation with the sintering process. The decomposition of magnetic spectra into domain-wall-motion and spin-rotation components offered insights into the dominant magnetization mechanisms, with the domain wall movement becoming increasingly significant at higher sintering temperatures. The samples sintered at 1310 °C showcased superior permeability and the least loss in our investigations. This research underscores the impact of sintering conditions on the magnetic behavior of MnZn ferrites, providing valuable guidelines for optimizing their magnetic performance in advanced electronic applications and contributing to the material science field’s understanding of the interplay between sintering, microstructures, and magnetic properties.

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The improved saturation magnetization and initial permeability in Mn–NiZn ferrites after cooling in vacuum

Cited by 16 publications

References 27 publications

Study of Urbach energy and Kramers–Kronig on Mn and Zn doped NiFe2O4 ferrite nanopowder for the determination of structural and optical characteristics

Study of Urbach energy and Kramers–Kronig on Mn and Zn doped NiFe2O4 ferrite nanopowder for the determination of structural and optical characteristics

All-Around Electromagnetic Wave Absorber Based on Ni–Zn Ferrite

Contribution of Magnetization Mechanisms in MnZn Ferrites with Different Grain Sizes and Sintering Densification

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