The Experts below are selected from a list of 98253 Experts worldwide ranked by ideXlab platform
Maosheng Cao - One of the best experts on this subject based on the ideXlab platform.
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confinedly implanted nife 2 o 4 rgo cluster tailoring and highly tunable Electromagnetic Properties for selective frequency microwave absorption
Nano Research, 2018Co-Authors: Yanlan Zhang, Xixi Wang, Maosheng CaoAbstract:Lightweight and high-efficiency microwave absorption materials with tunable Electromagnetic Properties is a highly sought-after goal and a great challenge for researchers. In this work, a simple strategy of confinedly implanting small NiFe2O4 clusters on reduced graphene oxide is demonstrated, wherein the magnetic clusters are tailored, and more significantly, the Electromagnetic Properties are highly tuned. The microwave absorption was efficiently optimized yielding a maximum reflection loss of –58 dB and ∼12 times broadening of the bandwidth (at –10 dB). Furthermore, tailoring of the implanted magnetic clusters successfully realized the selective-frequency microwave absorption, and the absorption peak could shift from 4.6 to 16 GHz covering 72% of the measured frequency range. The fascinating performances eventuate from the appropriately tailored clusters, which provide optimal synergistic effects of the dielectric and magnetic loss caused by multi-relaxation, conductance, and resonances. These findings open new avenues for designing microwave absorption materials in future, and the well-tailored NiFe2O4-rGO can be readily applied as a multi-functional microwave absorption material in various fields ranging from civil and commerce to military and aerospace.
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nd doping of bismuth ferrite to tune Electromagnetic Properties and increase microwave absorption by magnetic dielectric synergy
Journal of Materials Chemistry C, 2015Co-Authors: Wenqiang Cao, Jie Yuan, Dawei Wang, Maosheng CaoAbstract:Simultaneously achieving tunable Electromagnetic parameters and strong absorption capacity in a single material is still a great challenge. Here, we present Nd doped BiFeO3 with Electromagnetic matching, which exhibits tunable Electromagnetic Properties and high-performance microwave absorption. The experimental and calculated results demonstrate that Nd doping generates the ordered domain structure and changes the coupling states of electrons, which induce difficult polarization rotation and strong natural ferromagnetic resonance, leading to the decrease of dielectric loss and the increase of magnetic loss with increasing Nd concentration. The Electromagnetic parameters are tuned from mismatching to matching, and the microwave absorption is improved. Bi0.8Nd0.2FeO3 exhibits a remarkable reflection loss (RL) of −42 dB and bandwidth (RL ≤ −10 dB) which covers nearly three quarters of the X-band at a thickness from 1.9 to 2.1 mm. This work highlights the applications of BFO as a high-performance microwave absorber and opens up a promising feasible route to the development of microwave absorbers in imaging, healthcare, information safety and military fields.
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3d fe3o4 nanocrystals decorating carbon nanotubes to tune Electromagnetic Properties and enhance microwave absorption capacity
Journal of Materials Chemistry, 2015Co-Authors: Yihua Chen, Zihan Huang, Wenqiang Cao, Jie Yuan, Deqing Zhang, Maosheng CaoAbstract:We fabricated a novel dielectric–magnetic nanostructure by hybridizing 3D Fe3O4 nanocrystals and multi-walled carbon nanotubes through a simple co-precipitation route. The 3D Fe3O4-MWCNTs composites demonstrate enhanced microwave absorption with tunable strong-absorption wavebands in the frequency range of 2–18 GHz. Double-band microwave absorption appears in the investigated frequency range and at various thicknesses. This depends on the loading concentration of 3D Fe3O4-MWCNTs. Minimum reflection loss values at 20 wt% loading of −23.0 dB and −52.8 dB are observed at 4.1 GHz and 12.8 GHz, respectively, which are superior to those of pure MWCNTs as well as other hybrids of Fe3O4. The improved absorption capacity arises from the synergy of dielectric loss and magnetic loss, as well as the enhancement of multiple interfaces among 3D Fe3O4 nanocrystals. All of these factors increase the flexibility of tuning microwave absorption. These results provide a new strategy to tune Electromagnetic Properties and enhance the capacity of high-efficient microwave absorbers.
A V Trukhanov - One of the best experts on this subject based on the ideXlab platform.
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correlation of the atomic structure magnetic Properties and microwave characteristics in substituted hexagonal ferrites
Journal of Magnetism and Magnetic Materials, 2018Co-Authors: A V Trukhanov, V G Kostishyn, L V Panina, V V Korovushkin, V A Turchenko, D A Vinnik, S V Trukhanov, E S YakovenkoAbstract:Abstract Present paper describes variation of structure and magnetic Properties in diamagnetically doped barium hexaferrites. Al3+ and In3+ diamagnetic ions were chosen for investigation of the correlation between the chemical composition, crystal structure, magnetic Properties and microwave characteristics in BaFe12−xDIxO19 solid solutions. The changes of structure and electronic Properties were investigated using neutron powder diffraction and Mossbauer spectroscopy. These data were used for discussion of the Electromagnetic Properties changes. It was demonstrated possibility of Electromagnetic Properties control in the samples. It was shown that all samples demonstrate correlation between Electromagnetic Properties and the level of chemical substitution. The transmission spectra of all the samples demonstrated a deep minimum in the frequency range 20–65 GHz which was associated with the natural ferromagnetic resonance (NFMR). Calculated data for Electromagnetic absorption correlates well with experimental transmission spectra. External magnetic field leads to shift of the NFMR peak due to increase of magnetic anisotropy. It was concluded that the intrasublattice interactions were responsible for tailoring the magneto crystalline anisotropy and resonance parameters.
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critical influence of different diamagnetic ions on Electromagnetic Properties of bafe12o19
Ceramics International, 2018Co-Authors: A V Trukhanov, V G Kostishyn, L V Panina, V A Turchenko, D A Vinnik, S V Trukhanov, T I Zubar, E S Yakovenko, Yu L MacuyAbstract:Abstract The correlation between the Electromagnetic Properties of BaFe12-xDxO19 (0.1⩽x⩽1.2) solid solutions (D = Al3+, In3+ and Ga3+) and the concentration of diamagnetic ions was investigated. The changes of Electromagnetic Properties of the investigated samples were explained using neutron powder diffraction and Mossbauer spectroscopy data. The diamagnetic ions with different ionic radii and electronic configurations were chosen. The transmission spectra of all the samples demonstrated a deep minimum in the frequency range 20–65 GHz which was associated with the natural ferromagnetic resonance. The resonance frequency f res and amplitude were changed by the substitution type and level. With increasing the substitution concentration, the resonance frequency increases from 51 GHz to 61 GHz and decreases from 50.5 GHz to 27 GHz for Al- and In-substituted samples, respectively. More complicated concentration dependences of resonance characteristics were obtained for Ga-substituted samples in a narrow range of 49–50.5 GHz. The value of f res had a minimum around x = 0.6 and further increased to 50.5 GHz for x = 1.2. It was concluded that the intrasublattice interactions were responsible for tailoring the magneto crystalline anisotropy and resonance parameters. More detailed investigations would require the development of phenomenological model on the basis of the electronic structure using Goodenough-Kanamori approaches.
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control of Electromagnetic Properties in substituted m type hexagonal ferrites
Journal of Alloys and Compounds, 2018Co-Authors: A V Trukhanov, V G Kostishyn, L V Panina, V V Korovushkin, V A Turchenko, P S Thakur, Atul Thakur, Yujie Yang, D A VinnikAbstract:Abstract Present paper describes systematic studies of the functional BaFe12-xDIxO19 (DI = Al3+, In3+ 0.1 ≤ x ≤ 1.2) solid solutions. Correlation between the fine atomic structure and intrasublattice Fe3+ - O2− - Fe3+ superexchange interactions were explained using precision neutron powder diffraction and Mossbauer spectroscopy. Critical influence of the diamagnetic Al3+ and In3+ ions on Electromagnetic Properties in substituted Ba-hexaferrites (M-type) was discussed. Transmission spectra demonstrated a deep minimum in the frequency range 20–65 GHz due to natural ferromagnetic resonance (NFMR). Increase of the Al3+ ions concentration shifted the resonance frequency from 51 GHz to 61 GHz. Increase of the In3+ ions shifted the resonance frequency from 50.5 GHz to 27 GHz. Data of the numerical calculations and experimental results correlates well. It has been demonstrated that external magnetic fields critically influence on Electromagnetic Properties due to increase of magnetic anisotropy. This opens broad perspectives for practical applications.
Xiaogu Huang - One of the best experts on this subject based on the ideXlab platform.
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tunable Electromagnetic Properties and enhanced microwave absorption ability of flaky graphite cobalt zinc ferrite composites
Journal of Alloys and Compounds, 2016Co-Authors: Xiaogu Huang, Jing Zhang, Tianyi Sang, Weifeng Rao, Bo Song, Chingping WongAbstract:Abstract In this study, the flaky graphite/cobalt zinc ferrite composites were synthesized by the coprecipitation method. The XRD results showed that the flaky graphite/cobalt zinc ferrite composites can be obtained and there is no impurity when the graphite weight ratio is less than 20 wt%. The FE-SEM results exhibited that the flaky graphite/cobalt zinc ferrite composites possessed flake-like shape with high aspect ratio. Moreover, the Electromagnetic Properties could be tuned by varying the graphite weight ratio. In the series of as-prepared flaky graphite/cobalt zinc ferrite composites, the sample with 10 wt% graphite possessed excellent impedance matching performance. As a result, the it exhibited the best microwave absorption Properties. The reflection loss was less than −10 dB in frequency range of 10.3–13.5 GHz and the maximum reflection loss was reach to −33.85 dB at 11.7 GHz when the coating thickness was 2.5 mm. Moreover, the Electromagnetic analysis demonstrated that the Electromagnetic loss Properties and the Electromagnetic impedance matching performance should be both satisfied to obtain the excellent microwave absorption Properties. This study was meaningful to design the ferrite/carbon composites based microwave absorbers.
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preparation and microwave absorption mechanisms of the nizn ferrite nanofibers
Journal of Alloys and Compounds, 2015Co-Authors: Xiaogu Huang, Jing Zhang, Min Lai, Tianyi SangAbstract:Abstract In this paper, the Ni x Zn (1− x ) Fe 2 O 4 ( x = 0.2, 0.4, 0.5, 0.6, 0.8) ferrite nanofibers were synthesized by electrospinning method. The microstructure, Electromagnetic Properties and microwave absorption mechanisms were analyzed (in detail). The results indicated that the nanofiber diameter, the saturation magnetization, the coercivity and the Electromagnetic Properties could be optimized by tuning the Ni 2+ content. The Ni 0.5 Zn 0.5 Fe 2 O 4 ferrite nanofiber finally performed the excellent microwave absorption Properties. The reflection loss was less than −10 dB in the whole X -band frequencies. The analysis of microwave absorption mechanism indicated that the microwave absorption bandwidth was mainly depended on the input impedance matching, the enhanced Electromagnetic loss Properties ensured that the entering wave could be mostly absorbed, and the frequency appearing the reflection loss peak was determined by the absorber thickness.
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er3 substituted w type barium ferrite preparation and Electromagnetic Properties
Journal of Rare Earths, 2010Co-Authors: Xiaogu Huang, Jing Zhang, Lixi Wang, Hongzhou Wang, Shaoteng Yan, Qitu ZhangAbstract:Abstract Er 3+ -substituted W-type barium ferrites Ba 1- x Er x (Zn 0.3 Co 0.7 ) 2 Fe 16 O 27 ( x =0.00, 0.05, 0.10, 0.15, 0.20) were synthesized by polymer adsorbent combustion method. Samples were characterized by X-ray diffraction analysis (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and network analyzer to investigate the relationships among Er 3+ concentration, crystal structure, surface morphology and Electromagnetic Properties. All the XRD patterns showed pure phase of W-type barium ferrite when x =0.15, while the impurity phase of ErFeO 3 appeared when x =0.20. The pure W-type barium ferrite showed a hexagonal flake shape. In addition, the microwave Electromagnetic Properties of samples were analyzed in the frequency range of 2-18 GHz. It was indicated that the Electromagnetic Properties were significantly improved when Er 3+ doping content was 0.10. The reasons were also discussed using Electromagnetic theory. The optimized ferrite exhibited excellent microwave absorption performance. The maximum of reflection loss (RL) reached about −27.4 dB and RL was below −10 dB at the frequency range from 8.4 GHz to 18 GHz, when the thickness was 2.6 mm.
Alain Tabbagh - One of the best experts on this subject based on the ideXlab platform.
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quantifying multiple Electromagnetic Properties in emi surveys a case study of hydromorphic soils in a volcanic context the lac du puy france
Geoderma, 2020Co-Authors: Francoisxavier Simon, Mathias Pareilhpeyrou, Solene Buvat, Alfredo Mayoral, Philippe Labazuy, Karim Kelfoun, Alain TabbaghAbstract:We used two different loop-loop Electromagnetic induction (EMI) devices to determine the 3D geometry and morphology of the pedo-sedimentary filling and underlying basaltic bedrock of a former wetland in a volcanic soil area, the Lac du Puy depression (Auvergne, France). Electrical conductivity (or resistivity) is usually sufficient for environmental and soil science applications, but the local volcanic context of the survey area results in high values of magnetic susceptibility and possible electrical polarization effects. Therefore we investigated the roles of the four Properties: electrical conductivity, magnetic susceptibility, magnetic viscosity and dielectric permittivity. We created models using these four Properties for the two coil configurations of each device in order to assess the degree to which each of the Properties contributed to the recorded Electromagnetic signal. The results show that electrical conductivity controls the quadrature component of the secondary field response but that it can be affected by high values of magnetic viscosity, while magnetic susceptibility controls the in-phase component. Moreover, the low frequencies imply a limited contribution of dielectric permittivity to the in-phase component, except in the cases of higher permittivity or frequency values or greater inter-coil separation. Based on these observations, we propose a way to map the apparent Properties from field measurements. We then carried out a 1D inversion, first by considering the electrical conductivity alone and secondly by taking all the Electromagnetic Properties into account. The results show that there is a marked contrast in the complex magnetic susceptibility between the sedimentary in-fill and the border of the Lac de Puy depression, (stronger than for the electrical conductivity), and that permittivity is unlikely to have a significant influence. The shape and nature of the sedimentary in-fill was thus considerably refined by the second inversion results based on the three other Properties. These data, combined with litho-stratigraphic observations from a previous study, allowed the lateral continuity and geometry of the in-fill to be assessed across the whole basin. Results are also consistent with previous interpretations of the depression as a pseudo-sinkhole, a relatively common morphology in volcanic plateaus. Analysis of the magnetic Properties also made it possible to characterize the spatial variation of some key features related to hydromorphic processes, such as clayey granularity and the development of iron oxides/hydroxides. This opens up the possibility for using new methods for rapid spatial and pedological characterization of hydromorphic soils and palaeosoils.
D A Vinnik - One of the best experts on this subject based on the ideXlab platform.
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correlation of the atomic structure magnetic Properties and microwave characteristics in substituted hexagonal ferrites
Journal of Magnetism and Magnetic Materials, 2018Co-Authors: A V Trukhanov, V G Kostishyn, L V Panina, V V Korovushkin, V A Turchenko, D A Vinnik, S V Trukhanov, E S YakovenkoAbstract:Abstract Present paper describes variation of structure and magnetic Properties in diamagnetically doped barium hexaferrites. Al3+ and In3+ diamagnetic ions were chosen for investigation of the correlation between the chemical composition, crystal structure, magnetic Properties and microwave characteristics in BaFe12−xDIxO19 solid solutions. The changes of structure and electronic Properties were investigated using neutron powder diffraction and Mossbauer spectroscopy. These data were used for discussion of the Electromagnetic Properties changes. It was demonstrated possibility of Electromagnetic Properties control in the samples. It was shown that all samples demonstrate correlation between Electromagnetic Properties and the level of chemical substitution. The transmission spectra of all the samples demonstrated a deep minimum in the frequency range 20–65 GHz which was associated with the natural ferromagnetic resonance (NFMR). Calculated data for Electromagnetic absorption correlates well with experimental transmission spectra. External magnetic field leads to shift of the NFMR peak due to increase of magnetic anisotropy. It was concluded that the intrasublattice interactions were responsible for tailoring the magneto crystalline anisotropy and resonance parameters.
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critical influence of different diamagnetic ions on Electromagnetic Properties of bafe12o19
Ceramics International, 2018Co-Authors: A V Trukhanov, V G Kostishyn, L V Panina, V A Turchenko, D A Vinnik, S V Trukhanov, T I Zubar, E S Yakovenko, Yu L MacuyAbstract:Abstract The correlation between the Electromagnetic Properties of BaFe12-xDxO19 (0.1⩽x⩽1.2) solid solutions (D = Al3+, In3+ and Ga3+) and the concentration of diamagnetic ions was investigated. The changes of Electromagnetic Properties of the investigated samples were explained using neutron powder diffraction and Mossbauer spectroscopy data. The diamagnetic ions with different ionic radii and electronic configurations were chosen. The transmission spectra of all the samples demonstrated a deep minimum in the frequency range 20–65 GHz which was associated with the natural ferromagnetic resonance. The resonance frequency f res and amplitude were changed by the substitution type and level. With increasing the substitution concentration, the resonance frequency increases from 51 GHz to 61 GHz and decreases from 50.5 GHz to 27 GHz for Al- and In-substituted samples, respectively. More complicated concentration dependences of resonance characteristics were obtained for Ga-substituted samples in a narrow range of 49–50.5 GHz. The value of f res had a minimum around x = 0.6 and further increased to 50.5 GHz for x = 1.2. It was concluded that the intrasublattice interactions were responsible for tailoring the magneto crystalline anisotropy and resonance parameters. More detailed investigations would require the development of phenomenological model on the basis of the electronic structure using Goodenough-Kanamori approaches.
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control of Electromagnetic Properties in substituted m type hexagonal ferrites
Journal of Alloys and Compounds, 2018Co-Authors: A V Trukhanov, V G Kostishyn, L V Panina, V V Korovushkin, V A Turchenko, P S Thakur, Atul Thakur, Yujie Yang, D A VinnikAbstract:Abstract Present paper describes systematic studies of the functional BaFe12-xDIxO19 (DI = Al3+, In3+ 0.1 ≤ x ≤ 1.2) solid solutions. Correlation between the fine atomic structure and intrasublattice Fe3+ - O2− - Fe3+ superexchange interactions were explained using precision neutron powder diffraction and Mossbauer spectroscopy. Critical influence of the diamagnetic Al3+ and In3+ ions on Electromagnetic Properties in substituted Ba-hexaferrites (M-type) was discussed. Transmission spectra demonstrated a deep minimum in the frequency range 20–65 GHz due to natural ferromagnetic resonance (NFMR). Increase of the Al3+ ions concentration shifted the resonance frequency from 51 GHz to 61 GHz. Increase of the In3+ ions shifted the resonance frequency from 50.5 GHz to 27 GHz. Data of the numerical calculations and experimental results correlates well. It has been demonstrated that external magnetic fields critically influence on Electromagnetic Properties due to increase of magnetic anisotropy. This opens broad perspectives for practical applications.