Analysis of the structure and Mössbauer study of the neodymium substitution in the Sr-hexaferrite

Pérez-Juache, T. J.; Guerrero, A. Lobo; Cabal-Velarde, J. G.; Mirabal‐García, M.; Palomares-Sánchez, S.A.; Matutes-Aquino, J.A.

doi:10.1016/j.physb.2016.09.026

Cited by 15 publications

(4 citation statements)

References 32 publications

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“…Note that the ratio σ R /σ s is close to 0.5, which is characteristic of samples with complete randomly oriented crystallites 28 . Similar values for σ R /σ s have been obtained in compounds prepared by conventional methods 29 …”

Section: Resultssupporting

confidence: 78%

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Touch‐free reactive flash sintering of dense strontium hexaferrite permanent magnet

et al. 2023

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This work presents an extension of the touch‐free flash sintering technique. In the proposed technique, chemical reaction and sintering occur in a single step, without the use of electrodes, in the presence of electric and magnetic fields. We show that a dense, single‐phase strontium hexaferrite magnet can be produced from a mixture of commercial carbonates and oxides powders in a single step in a little more than a minute. This new technique implies significant reduction in energy and time consumption (primarily because of ultrafast processing) relative to conventional sintering.This article is protected by copyright. All rights reserved

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Section: Resultssupporting

confidence: 78%

“…28 Similar values for 𝜎 R /𝜎 s have been obtained in compounds prepared by conventional methods. 29 The energy product 𝐵𝐻 max is the figure of merit for hard magnets. It is associated with the energy stored in the magnetic field lines.…”

Section: Structural Microstructural and Magnetic Characterizationmentioning

confidence: 99%

Touch‐free reactive flash sintering of dense strontium hexaferrite permanent magnet

et al. 2023

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“…43 The results of Mössbauer investigation of Al substituted M-type hexaferrites indicated that Al 3+ ions have a strong preference for 4f 2 , 2a and 12k sites. 44,45 Mössbauer investigation confirmed that Co 2+ ions substitute for Fe 3+ ions at 4f 2 (mainly) and 2a sites.…”

Section: -mentioning

confidence: 99%

Preparation of Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites and their controlled magnetic properties

et al. 2018

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Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites with cation compositions Sr0.5Ca0.2Nd0.3Fe12.0-x(Al0.5Co0.5)xO19 were synthesized using the traditional ceramic process by varying AlCo content (x) (0.0 ≤ x ≤ 0.5). The microstructures, morphologies and ferromagnetic properties of the samples were investigated as a function of AlCo content (x) by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transformer infrared (FT-IR) spectroscopy and Hysteresis graph meter. The X-ray diffraction patterns show that the hexaferrites with AlCo content (x) of 0.0 ≤ x ≤ 0.2) exhibited M-type phase and α-Fe2O3 as impurity phase, while the hexaferrites with AlCo content (x) ≥ 0.3 exhibited the single M-type phase. XRD, along with FT-IR analysis confirmed the formation of M-type hexaferrites and the successful substitution of Al3+ and Co2+ ions in the hexaferrite lattice. The results of FE-SEM images proposed that all the particles with regular hexagonal platelet-like shape were homogeneous dispersed. The remanence (Br) first increased with AlCo content (x) from 0.0 to 0.3, and then decreased when AlCo content (x) ≥ 0.3. The intrinsic coercivity (Hcj) and magnetic induction coercivity (Hcb) first increased with AlCo content (x) from 0.0 to 0.2, and then decreased with AlCo content (x) from 0.2 to 0.3, and increased when AlCo content (x) ≥ 0.3. Maximum energy product [(BH)max] first increased with AlCo content (x) from 0.0 to 0.2, and then decreased at AlCo content (x) ≥ 0.2. Squareness ratio (Hk/Hcj) decreased with increasing AlCo content (x) from 0.0 to 0.5.

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“…Most of the recent hexaferrite researches are focused on Sr-hexaferrites. Single doping for hexaferrites has been carried out in some researches where M-type hexagonal ferrites have been doped by Sm 3+ and Sr-hexaferrite has been doped by Nd 3+ cations [9,10]. In a couple of recent researches, Gd 3+ and Tb 3+ have been utilized as dopants for Sr-hexaferrites [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

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Işıkcı

et al. 2020

Advances in Materials Science

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Ba0.85(La,Y)0.15Fe12O19 hexaferrite magnets were produced using the powder metallurgy method. The phase analysis of the ferrite magnets was carried out by X-ray diffraction (XRD) technique. A single hexaferrite phase was present in both samples as revealed by XRD patterns. The microstructural evolution in the hexaferrite samples was examined using Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-Ray Spectroscopy (EDS). The grain morphology altered with the sintering temperature. Room temperature ferrimagnetic hysteresis curves were obtained by Vibrating Sample Magnetometer (VSM). The crystallite size and the lattice parameters (a,c) were also calculated after sintering at 1150ºC and 1250ºC. Saturation magnetizations, Ms were determined to be 48.60 emu/g and 52.95 emu/g for the samples sintered at 1150ºC and 1250ºC, respectively whereas the remanent magnetizations, Mr were 29.26 emu/g and 31.17 emu/g. The coercivity, Hc decreased from 3.95 kOe to the value of 2.44 kOe with the sintering temperature due to the increase of the crystallite size. The squareness ratios (Mr/Ms) of the ferrimagnetic samples were different because the uniaxial anisotropies altered after sintering at 1150ºC and 1250ºC. The maximum energy product, (BH)max dropped from 35.81 kJ/m3 to 27.38 kJ/m3 when the sintering temperature increased. This result can be attributed to a combination of higher magnetization and the lower coercivity.

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Analysis of the structure and Mössbauer study of the neodymium substitution in the Sr-hexaferrite

Cited by 15 publications

References 32 publications

Touch‐free reactive flash sintering of dense strontium hexaferrite permanent magnet

Touch‐free reactive flash sintering of dense strontium hexaferrite permanent magnet

Preparation of Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites and their controlled magnetic properties

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉

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Analysis of the structure and Mössbauer study of the neodymium substitution in the Sr-hexaferrite

Cited by 15 publications

References 32 publications

Touch‐free reactive flash sintering of dense strontium hexaferrite permanent magnet

Touch‐free reactive flash sintering of dense strontium hexaferrite permanent magnet

Preparation of Al3+-Co2+ co-substituted M-type SrCaNd hexaferrites and their controlled magnetic properties

Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe12O19

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Effect of Rare-Earth Co-Doping on the Microstructural and Magnetic Properties of BaFe₁₂O₁₉