Effect of annealing temperature on structural and magnetic properties of BaFe12O19 hexaferrite nanoparticles

Mosleh, Z.; Kameli, P.; Ranjbar, M.; Salamati, H.

doi:10.1016/j.ceramint.2013.12.068

Cited by 119 publications

(35 citation statements)

References 26 publications

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“…During the sample heating, a monotonous decrease of magnetic susceptibility down to T 1 = 604-620 K is observed, then χ is either constant or increases reaching the maximum (at T 2 ≈ 660 K), while at T c1 ≈ 730 K a sharp decrease of magnetic susceptibility is observed, which is associated with BaFe 12 O 19 magnetic phase transition [5,7,12,13]. After that, a less sharp phase transition at T c2 ≈ 845-858 K for Fe 2 O 3 takes place.…”

Section: Magnetic Properties Of Ferrite Powdersmentioning

confidence: 93%

Synthesis and properties of ferrite nanopowders for epoxy‐barium hexaferrite‐nanocarbon composites for microwave applications

Вовченко

Matzui

Brusylovets

et al. 2016

Materialwissenschaft Werkst

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The effect of the synthesis conditions (type of chemical reagents, temperature of treatment) on phase composition and morphology of ferrite nanopowders containing barium hexaferrite was investigated. X-ray diffraction studies confirm the presence of two phases in synthesized powders -Fe 2 O 3 and BaFe 12 O 19 (BaM) -and ratio between these phases depends on the temperature of powder treatment at last stage of the synthesis. Electron microscopy studies showed that prepared ferrite powders consist of hexagonal particles having 20-50 nm thickness and 80-400 nm diameter, with exact values depending on the synthesis parameters. Measurements of magnetic susceptibility in the temperature range 300-850 K as well as the ferromagnetic resonance study confirm the presence of two phases in the prepared ferrite powders and correlate with the X-ray diffraction data. It was found that the addition of conductive carbon nanotubes or graphite nanoplatelets into the hybrid epoxybarium hexaferrite composites allows to control the parts of absorbed and reflected microwave electromagnetic radiation in these composites.Keywords: Barium hexaferrite / magnetic susceptibility / nanocarbon filler / electromagnetic shielding / dielectric permittivity Schlüsselwörter: Bariumhexaferrit / magnetische Suszeptibilität / Nano-Kohlenstoff Füllstoff / elektromagnetische Abschirmung / dielektrische Permittivität

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Section: Magnetic Properties Of Ferrite Powdersmentioning

confidence: 93%

Synthesis and properties of ferrite nanopowders for epoxy‐barium hexaferrite‐nanocarbon composites for microwave applications

Вовченко

Matzui

Brusylovets

et al. 2016

Materialwissenschaft Werkst

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“…The vibrational mode of tetrahedral sites is higher than that of octahedral sites, which should be attributed to the shorter bond length of tetrahedral sites. 37 The values of absorption bands derived from FT-IR spectra are tabulated in Table II. The range of absorption bands obtained is in agreement with that reported by Mahadevan et al 38 It can be identified from Table II and v 2 shift to a higher wave number should be due to the following fact.…”

Section: Resultsmentioning

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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“…However, with the development of advanced integrated devices, pure M-type barium ferrite could hardly meet the new demands. Improving properties became a focus of attention in recent years [3][4][5]. Ion substitution was considered as the most effective technique of adjusting properties.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of M–Ti (M = Ni or Zn) co-substituted M-type barium ferrite by a novel sintering process

Zhang

Liu

et al. 2014

J Mater Sci: Mater Electron

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M 2? (Ni 2? or Zn 2? ) ion together with Ti 4? ion were substituted for two trivalent Fe 3? ions of M-type barium ferrite in the form of Ba(MTi) x Fe 12-2x O 19 (x = 0.30, 0.60, 0.90 and 1.20). Samples were prepared by solid state reaction and sintered by a novel process. The samples were sintered by the sintering process at a high temperature of 1175°C for 6 h and slowly downed to 800°C at a rate of 1°C per 1 min, and then cooled in air. This process could control contract deformation of grains and effectively reduce the pore formation. Under the novel sintering process, with x = 0.30-1.20, co-substitution of M-Ti caused no change to the single phase M-type barium ferrite structure, and the samples exhibited more homogeneous microstructure. The bulk density (q) increased with Zn-Ti contents, and the maximum density was 4.75 g/cm 3 (x = 1.20), which was 89.7 % of theory density (5.29 g/cm 3 ). Magnetic properties such as saturation magnetization (M s ) and coercivity (H c ) decreased with increasing of M-Ti substituted contents. Magnetic permittivity increased first, and then decreased at different x content under Ni-Ti and Zn-Ti substitution.

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Effect of annealing temperature on structural and magnetic properties of BaFe12O19 hexaferrite nanoparticles

Cited by 119 publications

References 26 publications

Synthesis and properties of ferrite nanopowders for epoxy‐barium hexaferrite‐nanocarbon composites for microwave applications

Synthesis and properties of ferrite nanopowders for epoxy‐barium hexaferrite‐nanocarbon composites for microwave applications

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

Structural and magnetic properties of M–Ti (M = Ni or Zn) co-substituted M-type barium ferrite by a novel sintering process

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