Cation distribution in Ni-substituted Mn-ferrites by Mössbauer technique

Siddique, M.; Butt, N. M.; Shafi, Muhammad; Abbas, Tahir; Ul-Islam, Misbah

doi:10.1023/b:jrnc.0000011746.68066.f5

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…However, Mn 2+ and Fe 3+ ions can enter into A and B sublattices, where the ratio of Mn 2+ ions in A and B sublattices is four to one. Similar results were found in Ni-substituted Mn-ferrites [10].…”

Section: Fig 1 Heresupporting

confidence: 87%

Cation Distribution and Temperature Dependence of Brillouin Function for Nickel-Substituted Manganese–Zinc Ferrites

Sun

Yang

et al. 2015

IEEE Trans. Magn.

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Ni-substituted MnZn ferrites with the composition of Mn 0.506-x Zn 0.244 Ni x Fe 2.250 O 4.0 (x=0. 066~0.122) have been prepared by the solidstate reaction method. The cation distribution has been investigated by Rietveld refinement of X-ray diffraction patterns, the microstructure has been observed by scanning electron microscope (SEM), and the magnetic property has been measured by superconductor quantum interference devices (SQUID) and B-H analyzer. The results show that Zn 2+ and Ni 2+ ions prefer to occupy the tetrahedron site (A sublattice) and octahedron site (B sublattice), respectively. However, Mn 2+ and Fe 3+ ions can enter into A and B sublattices, where the ratio of Mn 2+ ions occupying A and B sublattices is four to one. The lattice parameter (a) of samples decreases with the increase of Ni-substituted content. Meanwhile, based on the Néel model of collinear-spin ferrimagnetism, the molecular-field coefficients ω AA , ω BB , and ω AB of Ni-substituted MnZn ferrites have been calculated, and the magnetic moment of A and B sublattices versus temperature T has also been investigated. The fitting results match well with the experimental data. Both ω AB and ω BB increase with the increase of Ni-substituted content, but ω AA shows the opposite variation trend. The Curie temperature also increases with the increasing of Ni-substituted content, which is attributed to the enhancement of super-exchange interaction for A-B sublattice. In addition, the temperature dependence of initial permeability and core loss has been discussed.

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Section: Fig 1 Heresupporting

confidence: 87%

Cation Distribution and Temperature Dependence of Brillouin Function for Nickel-Substituted Manganese–Zinc Ferrites

Sun

Yang

et al. 2015

IEEE Trans. Magn.

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“…It was reported that substitution of magnetic ion Cr 3+ in many ideal/mixed spinel ferrites affected the magnetic properties markedly similar to that of non-magnetic substitution [2,3]. The preference of Cr 3+ ions for octahedral sites is due to the favourable fit of the charge distribution of these ions in the crystal field of the octahedral sites [4]. In this work the spinel system MgFe 2−x Cr x O 4 (with x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) have been prepared, and investigated by means of X-ray diffraction (XRD), and Mössbauer techniques to elucidate the site occupancy of the cations in the system.…”

Section: Introductionmentioning

confidence: 98%

The structural and magnetic behaviour of the MgFe2 − xCrxO4 spinel ferrite

et al. 2012

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The crystal structure and magnetic properties of the spinel system MgFe 2−x Cr x O 4 (with x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) have been investigated by means of X-ray diffraction (XRD), and Mössbauer spectroscopy. The XRD patterns showed the samples were single-phase cubic spinels. The 295 K Mössbauer spectra of the studied samples showed a continuous collapse of the internal magnetic field for both tetrahedral (A) and octahedral [B] sites with increasing Cr contents. Their 78 K Mössbauer spectra showed an ordered magnetic structure for both sites with the internal magnetic fields decreasing with increasing Cr contents. The continuous decrease in the internal magnetic field is interpreted in terms of the weakening of A-B exchange interaction. The cation distribution at tetrahedral (A) and octahedral [B] sites and its effect on Mössbauer parameters is studied. Mg 2+ ions are found to occupy both sites A and B, while Cr 3+ ions occupy site B only.

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“…In summary, among the studies focusing on magnetic properties, composition, additives, sintering processes, and the spectra of complex permeability [27][28][29][30][31][32][33], few have delved into the contribution of magnetization mechanisms in MnZn ferrites as a function of grain size and its relationship with the sintering temperature. This research presents an exploration of the magnetization mechanisms in MnZn ferrites at different sintering temperatures, discussing the findings in conjunction with the fitting results of permeability spectrum dispersion.…”

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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Cation distribution in Ni-substituted Mn-ferrites by Mössbauer technique

Cited by 13 publications

References 14 publications

Cation Distribution and Temperature Dependence of Brillouin Function for Nickel-Substituted Manganese–Zinc Ferrites

Cation Distribution and Temperature Dependence of Brillouin Function for Nickel-Substituted Manganese–Zinc Ferrites

The structural and magnetic behaviour of the MgFe2 − xCrxO4 spinel ferrite

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

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