Enhancement of GHz electromagnetic wave absorption characteristics in aligned M-type barium ferrite Ba1−La Zn Fe12−−(Me0.5Mn0.5) O19 (x=0.0–0.5; y=1.0–3.0, Me: Zr, Sn) by metal substitution

Kagotani, Toshio; Fujiwara, Daisuke; Sugimoto, Satoshi; Inomata, K.; Homma, M.

doi:10.1016/j.jmmm.2003.12.878

Cited by 93 publications

(47 citation statements)

References 4 publications

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“…The intrinsic coercivity of strontium ferrite can be improved by the substitution of Sr ions with rare earth ions such as Sm, Nd and La [4][5][6][7]. Although a lot of work on characteristics of doped barium ferrite has been reported in the recent years [8][9][10][11], there seem to be no reports on the effect of substitution of Fe ions in strontium ferrite with compounds of divalent and tetravalent ions on its magnetic properties. In this study, the electromagnetic properties and microwave-absorbing characteristic of strontium ferrite in which Fe ions are substituted by Mn and Ti ions are investigated.…”

Section: Introductionmentioning

confidence: 99%

Microwave absorption properties of Mn- and Ti-doped strontium hexaferrite

Tabatabaie

Fathi

Saatchi

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Microwave absorption properties of Mn- and Ti-doped strontium hexaferrite

Tabatabaie

Fathi

Saatchi

et al. 2009

Journal of Alloys and Compounds

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“…The moderately low Hc indicates that the sample is a soft magnetic material and the domain wall motion is the dominant magnetization mechanism. It should be noted that the reduction in coercive force is authenticated by the fact that it is inversely related to grain size [20]. Fig.…”

Section: Resultsmentioning

confidence: 93%

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

Narang

Kaur

Bahel

2016

Materials Science-Poland

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M-type strontium ferrite with compositions SrFe (12−2x) Co x Ti x O 19 (x = 0.0, 0.3, 0.5, 0.7, 1.0), were prepared by two route ceramic method. The effects of Co-Ti substitution on their microstructure, electromagnetic properties, and microwave absorptive behavior were analyzed. The complex permittivity (ε -jε ) and complex permeability (µ -jµ ) have been measured from 8.2 to 12.4 GHz using a network analyzer. Scanning electron microscope was used to analyze the grain size distribution and porosity of the ferrite. X-ray diffraction confirmed the M-type structure of the doped strontium ferrite. Vibrating sample magnetometer was used to study hysteresis loop of the ferrite. This study suggests that the control of grain size, decrease in coercivity and enhanced values of dielectric constant and loss are effective means to improve microwave absorption. The dielectric constant and loss were enhanced in comparison to the permeability constant and loss over the entire frequency range.

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“…This is attributed to reduction of the crystal anisotropy field, because of the change of the easy axis of magnetization from the c axis to the basal plane. 26,27 It is a well known fact that coercive force is heavily dependent on grain size. 28…”

Section: Magnetic Propertiesmentioning

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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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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Enhancement of GHz electromagnetic wave absorption characteristics in aligned M-type barium ferrite Ba1−La Zn Fe12−−(Me0.5Mn0.5) O19 (x=0.0–0.5; y=1.0–3.0, Me: Zr, Sn) by metal substitution

Cited by 93 publications

References 4 publications

Microwave absorption properties of Mn- and Ti-doped strontium hexaferrite

Microwave absorption properties of Mn- and Ti-doped strontium hexaferrite

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

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

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