Structural, magnetic and microwave absorption properties of Ce-doped barium hexaferrite

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

doi:10.1016/j.jmmm.2015.08.078

Cited by 233 publications

(48 citation statements)

References 31 publications

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“…Natural ferromagnetic resonance (NFMR) in M-type barium hexaferrite occurs in U-band (EHF range, 47-50 GHz) due to the anisotropy of the c-axis, and therefore, these materials can be used as microwave EMR absorbers [11][12][13]. Doping of barium hexaferrite with various diamagnetic ions (DI), such as Al 3+ , In 3+ , Ga 3+ , Co 2+ and Sc 3+ makes it possible to adapt the magnetic characteristics, and consequently, to control the range of operating frequencies up to 70 GHz [14][15][16][17][18][19][20]. As it was shown in [21], the transmission and absorption spectra of Ba(Fe 1−x DI x ) 12 O 19 demonstrate, depending on the substitution type and ratio, a change in the frequency and maximum absorption (associated with the NFMR) owing to a corresponding change in magnetocrystalline anisotropy (MCA).…”

Section: Introductionmentioning

confidence: 99%

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

et al. 2019

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The paper describes preparation features of functional composites based on ferrites, such as “Ba(Fe1−xGax)12O19/epoxy,” and the results of studying their systems; namely, the correlation between structure, magnetic properties and electromagnetic absorption characteristics. We demonstrated the strong mutual influence of the chemical compositions of magnetic fillers (Ba(Fe1−xGax)12O19 0.01 < x < 0.1 solid solutions), and the main magnetic (coercivity, magnetization, anisotropy field and the first anisotropy constant) and microwave (resonant frequency and amplitude) characteristics of functional composites with 30 wt.% of hexaferrite. The paper presents a correlation between the chemical compositions of composites and amplitude–frequency characteristics. Increase of Ga-content from x = 0 to 0.1 in Ba(Fe1−xGax)12O19/epoxy composites leads to increase of the resonant frequency from 51 to 54 GHz and absorption amplitude from −1.5 to −10.5 dB/mm. The ability to control the electromagnetic properties in these types of composites opens great prospects for their practical applications due to high absorption efficiency, and lower cost in comparison with pure ceramics oxides.

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Section: Introductionmentioning

confidence: 99%

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

et al. 2019

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“…Hence, several research works have been carried out to improve the their magnetic properties through the partial substitution of Sr 2+ or Ba 2+ ions by rare earth elements such as Nd 3+ , Sm 3+ , La 3+ , Dy 3+ and Gd 3+ , or Fe 3+ ions by transition metal elements such as Co 2+ , Cu 2+ , Zn 2+ , Al 3+ , Cr 3+ and Bi 3+ ions. [12][13][14][15][16][17][18][19][20][21][22][23] Nd 3+ substitution on the magnetic properties of M-type strontium hexaferrites has been studied. 12 Liu et al have indicated that the for the M-type strontium ferrites, the magnetic properties, especially the coercive field, were remarkably modified due to the substitution of Fe 3+ ions by Co 2+ ions.…”

Section: Introductionmentioning

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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“…Ferrites, including soft magnetic and hard magnetic ferrites are better candidates for absorbing materials because of the high magnetic loss, though their dielectric loss has never been neglected, and have been intensively investigated [10][11][12]. Currently, the research interest in ferrite materials is to enhance the absorption intensity and broaden absorption bandwidth under −10 dB in the microwave band by doping [13][14][15] and controlling particle morphology and size [16][17][18][19]. Complex permeability of magnetic metal materials may decrease due to eddy current phenomena induced by electromagnetic waves, therefore, they usually form composites with other dielectric and magnetic Double-layer microwave absorber based on nanocrystalline CoFe 2 O 4 and CoFe 2 O 4 /PANI.…”

Section: Introductionmentioning

confidence: 99%

Double-layer microwave absorber based on nanocrystalline CoFe₂O₄and CoFe₂O₄/PANI multi-core/shell composites

Shen

et al. 2017

Materials Science-Poland

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Organic-inorganic nano-CoFe 2 O 4 /PANI (polyaniline) multi-core/shell composites have been successfully synthesized by chemical oxidative polymerization of aniline. The characterization results showed that the ferrite nanocrystals were efficiently embedded in PANI. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. Double-layer absorbers based on the CoFe 2 O 4 /PANI composite (matching layer) and calcined CoFe 2 O 4 ferrite (absorbing layer) have been designed. The reflection loss of the microwave absorbers of both single layer and double-layer with a total thickness of 2.0 mm and 2.5 mm was calculated according to transmission-line theory. The results indicated that the minimum reflection loss of the CoFe 2 O 4 /PANI composite was −19.0 dB at 16.2 GHz at the thickness of 2.0 mm and −23.6 dB at 13.1 GHz at the thickness of 2.5 mm, respectively. The minimum reflection loss for double-layer absorbers reached −28.8 dB at 16.2 GHz at the total thickness of 2.0 mm, and −31.1 dB at 12.8 GHz at the total thickness of 2.5 mm. The absorption bandwidth under −10 dB was 4.2 GHz (13.8 GHz to 18.0 GHz) and 5.5 GHz (10.3 GHz to 15.8 GHz), respectively. The results show that the reflection loss and absorption bandwidth of the double-layer absorbers are obviously enhanced compared to corresponding single layer absorbers.

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Structural, magnetic and microwave absorption properties of Ce-doped barium hexaferrite

Cited by 233 publications

References 31 publications

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

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

Double-layer microwave absorber based on nanocrystalline CoFe₂O₄and CoFe₂O₄/PANI multi-core/shell composites

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Structural, magnetic and microwave absorption properties of Ce-doped barium hexaferrite

Cited by 233 publications

References 31 publications

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

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

Double-layer microwave absorber based on nanocrystalline CoFe2O4and CoFe2O4/PANI multi-core/shell composites

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Resources

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Double-layer microwave absorber based on nanocrystalline CoFe₂O₄and CoFe₂O₄/PANI multi-core/shell composites