Structure and electromagnetic behavior of nanocrystalline in the 8–12 GHz frequency range

Sharbati, Ali; Choopani, Saeed; Azar, Ali-Mousavi; Senna, Mamoru

doi:10.1016/j.ssc.2010.09.040

Cited by 36 publications

(11 citation statements)

References 18 publications

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“…2a, 2b, 4f1, 4f2, and 12k. 9 Replacement of Fe 3+ ions by doping may perturb the crystal lattice. Figure 2 shows TEM images of Ca(MnSn) x Fe 12À2x O 19 samples.…”

Section: Resultsmentioning

confidence: 99%

“…8 Use of hexaferrites as absorbers of electromagnetic waves has attracted much attention in connection with stealth technology. 9 Hexaferrites were first developed in Japan by Y. Kato more than 85 years ago, and Japan has since maintained its leadership in this field. 10 During the past half century M-type ferrites with the formula MFe 12 O 19 (M = Ba, Sr, Pb, Ca), important magnetic materials, have been used for shielding of electromagnetic waves of gigahertz frequency.…”

Section: Introductionmentioning

confidence: 99%

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Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Ali-Sharbati

Amiri

Mousarezaei

2014

Journal of Elec Materi

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Nanoparticles of Ca(MnSn) x Fe 12À2x O 19 with x ranging from 0.00 to 0.6 in steps of 0.2 were prepared by use of the citrate precursor method. The structural, microwave-absorption, and magnetic properties of these ferrites were determined by use of different characterization techniques. The morphology of the ferrite powders was investigated by transmission electron microscopy (TEM). X-ray diffraction (XRD) was used for structural and micro-structural studies, and revealed that the samples had an M-type hexagonal structure. The crystallite size for each sample was calculated by use of the Scherrer formula for the most intense peak (411) and the results were compared with those obtained from TEM images of the samples. The particle size of the powder varied from 60 to 36 nm. Magnetic measurements were performed by vibrating sample magnetometry (VSM) at room temperature. The microwaveabsorption properties of ferrite (70 wt.%)-polymer (30 wt.%) composites 2 mm thick were investigated by vector network analysis (VNA) in the frequency range 12-20 GHz. The ferrite for which x = 0.4 had a minimum reflection loss of À29 dB at 17.3 GHz with a À15 dB bandwidth over the extended frequency ranges 12.9-14.5 GHz and 16.7-18 GHz. The minimum loss reached À32 dB at frequency of 17 GHz when the total amount of Mn 2+ and Sn 4+ ions was 0.6. These results suggest that the synthesized magnetic composites can be used as effective microwave absorbers in military applications (radar cross-section reduction).

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“…2a, 2b, 4f1, 4f2, and 12k. 9 Replacement of Fe 3+ ions by doping may perturb the crystal lattice. Figure 2 shows TEM images of Ca(MnSn) x Fe 12À2x O 19 samples.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Ali-Sharbati

Amiri

Mousarezaei

2014

Journal of Elec Materi

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“…Both the doped ions (Ti 4+ and Mg 2+ ) are nonmagnetic with their spins in the downward direction [21,22]. As they replace iron ions at the tetrahedral (4f 1 ) sites and the net spin of the Fe 3+ ions in the upward direction increases, the total magnetic moment increases; and so does the saturation magnetization.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Magnetic, microwave absorption and structural properties of Mg–Ti added Ca–M hexaferrite nanoparticles

Sharbati

Amiri

2017

J Mater Sci: Mater Electron

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“…This entails making the dielectric constant and magnetic permeability of the material equal to each other. Second, the incident electromagnetic wave must enter and be attenuated rapidly through the material layer, thus reducing the emerging wave to an acceptably low magnitude [6,7].…”

Section: Introductionmentioning

confidence: 99%

Determining of Crystallography Site Occupancy and Magnetic Consequences of Substituted Barium Ferrite Nanoparticles Synthesized by Sol-gel Process

Ghasemi

2015

J Supercond Nov Magn

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BaFe 12−x Tb x/4 Tm x/4 Ti x/2 O 19 (x = 0 − 2.5 in a step of 0.5) substituted barium ferrite nanoparticles were synthesized by a sol-gel method. The structural characteristics of ferrite were studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, FTIR, and 57 Fe Mössbauer spectroscopic measurements. It was found that single-phase barium ferrite nanoparticles with a narrow size distribution were successfully fabricated. The substituted cations were occupied in 12k sites. Vibrating sample magnetometer (VSM) results reflect that with an increase in substitution contents, the coercivity increases, while saturation of magnetization decrease. The reflection loss measurements were carried out on substituted ferrite nanoparticles. The obtained results revealed that the incorporation of Tm-Tb-Ti cations could enhance reflection loss and bandwidth in 8-12 GHz band. The role of matching thickness on the shifts of frequency was also investigated.

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Structure and electromagnetic behavior of nanocrystalline in the 8–12 GHz frequency range

Cited by 36 publications

References 18 publications

Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Structural, Magnetic, and Microwave-Absorption Properties of Nanocrystalline Ca(MnSn) x Fe12−2x O19 Ferrites

Magnetic, microwave absorption and structural properties of Mg–Ti added Ca–M hexaferrite nanoparticles

Determining of Crystallography Site Occupancy and Magnetic Consequences of Substituted Barium Ferrite Nanoparticles Synthesized by Sol-gel Process

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