Preparation and microwave absorption mechanisms of the NiZn ferrite nanofibers

Huang, Xiaogu; Zhang, Jing; Lai, Min; Sang, Tianyi

doi:10.1016/j.jallcom.2014.11.235

Cited by 257 publications

(78 citation statements)

References 38 publications

(37 reference statements)

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“…The porosity of the composites increases with the increasing volume fraction of SrTiO 3 . Similar phenomenon was reported by Anjana et al [18] when they studied low dielectric loss PTFE/CeO 2 composites. The dielectric constant increases from 7.74 to 24.33 as the weight fraction of SrTiO 3 varies from 50 to 80 wt%.…”

Section: Bulk Densitysupporting

confidence: 87%

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Dielectric properties of modified SrTiO3/PTFE composites for microwave RF antenna applications

Jin

Wang

et al. 2015

J Mater Sci: Mater Electron

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SrTiO 3 /PTFE composites with high dielectric constant and low loss properties were prepared via powder processing technique. The structure, morphology, dielectric and thermal properties of the composites were characterized by X-ray diffraction, scanning electron microscope, coefficient of thermal expansion, and network analyzer. SrTiO 3 /PTFE composites with 60 wt% SrTiO 3 are of high e r and high Q: e r = 12.19, Q 9 f = 1930 GHz. Additionally, theoretical models like Logarithmic mixture rule, Maxwell-Garnet, Effective medium theory and Smith's model were also used to predict the dielectric constant of these composites. The values obtained by the EMT model are in well agreement with the experimental values.

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Section: Bulk Densitysupporting

confidence: 87%

“…The deviation of the measured density from the calculated one increases with increasing weight fraction of the filler. Considering the three phases in the composite-matrix, filler, and air, the volume fraction of air (porosity) in the composite can be calculated by equation [18]:…”

Section: Bulk Densitymentioning

confidence: 99%

Dielectric properties of modified SrTiO3/PTFE composites for microwave RF antenna applications

Jin

Wang

et al. 2015

J Mater Sci: Mater Electron

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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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“…[19]. In recent years, much attention has been paid on studying the effect of the substitution in the material to enhance the piezoelectric and ferroelectric properties of the material [20,21]. The saturation magnetization and coercivity were enhanced by adding the Co 2?…”

Section: Introductionmentioning

confidence: 99%

Structural and electrical properties of BiFeO3–PbTiO3 system

Panda

Pattanayak²,

Choudhary

2015

J Mater Sci: Mater Electron

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The polycrystalline samples of lead titanatemodified bismuth ferrite [i.e., (BiFeO 3 ) 1-x ? (PbTiO 3 ) x with x = 0.0, 0.1, 0.2, 0.3] were synthesized by a hightemperature solid-state reaction route. The formation of the materials was confirmed through basic structural analysis using X-rays diffraction data collected at room temperature. Detailed studies of dielectric and impedance characteristics of the materials in a wide frequency (1 kHz-1 MHz) and temperature (30-500°C) ranges using complex impedance spectroscopic method have provided many new results. The frequency dependence of ac conductivity suggests that the samples obey Jonscher's universal power law. A strong corelation between the micro-structural and impedance parameters was observed. The frequency-temperature dependence of electric modulus and impedance parameters of the materials shows the presence of non-Debye type of relaxation.

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Preparation and microwave absorption mechanisms of the NiZn ferrite nanofibers

Cited by 257 publications

References 38 publications

Dielectric properties of modified SrTiO3/PTFE composites for microwave RF antenna applications

Dielectric properties of modified SrTiO3/PTFE composites for microwave RF antenna applications

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

Structural and electrical properties of BiFeO3–PbTiO3 system

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Preparation and microwave absorption mechanisms of the NiZn ferrite nanofibers

Cited by 257 publications

References 38 publications

Dielectric properties of modified SrTiO3/PTFE composites for microwave RF antenna applications

Dielectric properties of modified SrTiO3/PTFE composites for microwave RF antenna applications

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

Structural and electrical properties of BiFeO3–PbTiO3 system

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