Molten salt synthesis, formation mechanism and greatly enhanced magnetic properties of randomly oriented BaM ferrite

Li, Haifeng; Yi, Xialin; Yu-bo, WU; Xiang, Wei; Deng, Dongdong; Zheng, Lu; Luo, Wei; Luo, Xiang; Gong, Rongzhou; Zhang, Mei‐Jie

doi:10.1016/j.jallcom.2020.154083

Cited by 16 publications

(5 citation statements)

References 48 publications

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“…BaM hexaferrites with near-theoretical saturation magnetization (Ms) and large remanent magnetization (Mr) were prepared using a low-temperature MSM technique, with Ms, Mr, and Hc of 71.9 emu/g, 39.5 emu/g, 3849.1 Oe and 71.8 emu/g, 38.9 emu/g, 2890.3 Oe, respectively. The Ms value of the prepared samples BaM (MSS-S) achieved 104.8 emu/g at a low temperature of 5 K. The (0.5NaCl0.5KCl) combination salts were crucial in the establishment of hexagonal plate shape and the acquisition of considerably increased magnetic characteristics [59]. Melt-flux precipitation is a modification on this approach in which less fluxing material is introduced, resulting in only microregions of partially melted salt in which crystallisation occurs instead of a true liquid phase system.…”

Section: Molten Salt Methodsmentioning

confidence: 99%

“…The saturation magnetization of barium hexaferrite is 90emu/g at 10k and 59 emu/g at 300k [58]. Li et al [59] prepared BaM hexaferrite by MSM as shown in figure 8. BaM hexaferrites with near-theoretical saturation magnetization (Ms) and large remanent magnetization (Mr) were prepared using a low-temperature MSM technique, with Ms, Mr, and Hc of 71.9 emu/g, 39.5 emu/g, 3849.1 Oe and 71.8 emu/g, 38.9 emu/g, 2890.3 Oe, respectively.…”

Section: Molten Salt Methodsmentioning

confidence: 99%

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Hexagonal Ferrites, Synthesis, Properties and Their Applications

Dhiman

2021

Materials Research Foundations

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We intend to report on possible fabrication routes for all types of hexagonal ferrites which are known for their wide area of use and applications. Hexagonal ferrites have now become an intense topic of research as they are the part of most of magnetic recording and data storage applications globally. Hexagonal or popularly known as ‘Heaxa-ferrites’ are known for their utilization in permanent magnets and their utilization in electrical devices being operated at high frequencies especially at GHz frequencies. We have presented in this chapter all main six types of hexagonal ferrites i.e. M Type, Z-Type, Y-type, W-type, X-Type and U-type hexa-ferrites. Hexaferrites belong to ferromagnetic class of magnetic materials and their properties are purely dependent on intrinsic structure of ferrites. In this chapter, we aim to discuss more on M-type of hexa-ferrites, their properties and their applications. Also, recent advances on M-type ferrites are also a part of this chapter.

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Section: Molten Salt Methodsmentioning

confidence: 99%

Section: Molten Salt Methodsmentioning

confidence: 99%

Hexagonal Ferrites, Synthesis, Properties and Their Applications

Dhiman

2021

Materials Research Foundations

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“…The squareness in randomly oriented barium ferrite particles synthesized by various methods to apply permanent magnets is reported to be approximately around 0.5. 20) The effect of shape magnetic anisotropy due to the platelet shape of the particle is considered to increase because of the separation of the agglomerated plate-shaped particles through dispersion. The lower coercive force in sheets than that in particles is considered to be caused by an increase in the effect of the shape anisotropy field, which weakens the major crystalline magnetic anisotropy field.…”

Section: -2mentioning

confidence: 99%

“…To solve these problems, various chemical methods such as co-precipitation. [4][5][6] sol-gel process [7][8][9][10] hydrothermal synthesis, [11][12][13] glass crystallization, 14,15) spray-pyrolysis, 16) citrate synthesis, 17) and molten salt method, [18][19][20][21] have been employed.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of magnetic anisotropy in oriented plate-shaped strontium ferrite particles

Kubota,

Kishimoto,

Yanagihara

2023

Jpn. J. Appl. Phys.

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Plate-shaped hexagonal SrFe12O19 particles, synthesized using potassium bromide as the molten salt flux, were dispersed in the resin using a planetary ball mill. Oriented sheets were prepared by coating the dispersion onto the films under a magnetic field. The coercive force and squareness ratio of the oriented sheets were 412 kA/m and 0.91, respectively. The magnetic anisotropy field was determined by measuring the rotational hysteresis losses of the oriented sheets with a magnetic torque meter. The anisotropy field was distributed in the range of approximately 200–1100 kA/m, and particles with an anisotropy field of 478 kA/m comprised the majority. The magnetic anisotropy energy estimated from the magnetic anisotropy field was 104 KJ/m3. Assuming a reduction in the crystalline anisotropy field along the c-axis due to simply the shape anisotropy field resulting from the platelet shape of the particles, particles occupying the majority exhibited a maximum anisotropy field of 823 kA/m.

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“…As a magnetic loss absorbing material, 4 M-type barium ferrite (BaFe 12 O 19 ) has attracted significant attention due to its strong magnetic anisotropy, 5 high resonance frequency (f r ) (47.6 GHz), 6 large magnetic loss, high Curie temperature (T C = 472 °C), good chemical stability, and high resistivity as well. 7 However, BaFe 12 O 19 exhibits many drawbacks, such as high density, low dielectric loss, and inadequate impedance matching performance.…”

Section: Introductionmentioning

confidence: 99%

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

Chen,

Chen

et al. 2023

Inorg. Chem.

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Combining magnetic and dielectric materials to form a composite can significantly improve its impedance matching and electromagnetic wave absorption performance. Furthermore, composite materials with a core−shell structure hold promise in meeting the demand for lightweight and highly electromagneticabsorbing properties. In this study, uniform hexagonal flake barium ferrite (BaFe 12 O 19 ) was prepared using the hydrothermal method. Subsequently, BaFe 12 O 19 @PVDF composites were synthesized by the sol−gel method. By adjusting the mass ratio of BaFe 12 O 19 and PVDF, the shell size of the BaFe 12 O 19 @PVDF composite material was controlled, and its electromagnetic absorption performance was enhanced. The shell thickness of BaFe 12 O 19 @PVDF is 19.64 nm when the BaFe 12 O 19 : PVDF mass ratio is 1:1.0, and the optimal impedance matching is obtained at 13.4 GHz. Meanwhile, at a thickness of 1.5 mm, the minimum reflection loss (RL min ) reached −58.04 dB, and an effective absorption bandwidth (EAB) (RL ≤ −10 dB) of 5.53 GHz was achieved within the frequency range of 11.65 to 15.63 GHz and from 16.36 to 17.91 GHz. Besides, the composites with a matching thickness of 3.5 mm show a maximum EAB of 15.90 GHz when the mass ratio of BaFe 12 O 19 to PVDF is 1:1.2. Within the frequency range of 2−18 GHz, the coverage of reflection loss less than −10 dB is 99.38%, almost achieving full coverage. These results demonstrate that BaFe 12 O 19 @PVDF composites exhibit excellent electromagnetic-absorbing performances, making them an excellent candidate for electromagnetic wave absorption in 5G communications.

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Molten salt synthesis, formation mechanism and greatly enhanced magnetic properties of randomly oriented BaM ferrite

Cited by 16 publications

References 48 publications

Hexagonal Ferrites, Synthesis, Properties and Their Applications

Hexagonal Ferrites, Synthesis, Properties and Their Applications

Evaluation of magnetic anisotropy in oriented plate-shaped strontium ferrite particles

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

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Molten salt synthesis, formation mechanism and greatly enhanced magnetic properties of randomly oriented BaM ferrite

Cited by 16 publications

References 48 publications

Hexagonal Ferrites, Synthesis, Properties and Their Applications

Hexagonal Ferrites, Synthesis, Properties and Their Applications

Evaluation of magnetic anisotropy in oriented plate-shaped strontium ferrite particles

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe12O19@PVDF Composites

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Product

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Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites