Dielectric and magnetic properties of NiCuZn ferrite coated Sendust flakes through a sol–gel approach

Yang, Zhihong; Li, Z.W.; Yang, Yongbo; Liu, L.; Kong, Ling Bing

doi:10.1016/j.jmmm.2012.11.006

Cited by 34 publications

(8 citation statements)

References 19 publications

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“…To achieve effective attenuation, the high magnetic/dielectric loss is required. 16,25 In our case, the decrease in complex permittivity and the increase in complex permeability lead to the closer values of the two and thus a better impedance matching. The increased magnetic loss results in a better attenuation.…”

mentioning

confidence: 58%

“…It is well-known that two key factors that determine the RL values and the bandwidth: (1) the incident microwave that can transmit into the materials with minimum reflection and (2) the materials that can effectively attenuate the microwave transmitted into the composites.To allow the incident microwave transmit into the materials instead of reflecting back to the space, the material should have an impedance matching with that of free space, i.e., the material should have close values of permittivity and permeability. To achieve effective attenuation, the high magnetic/dielectric loss is required. , In our case, the decrease in complex permittivity and the increase in complex permeability lead to the closer values of the two and thus a better impedance matching. The increased magnetic loss results in a better attenuation.…”

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confidence: 99%

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Optimization of Zn_xFe_3–xO₄ Hollow Spheres for Enhanced Microwave Attenuation

Yang

et al. 2014

ACS Appl. Mater. Interfaces

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We report here the composition optimization of Zn(x)Fe(3-x)O4 hollow nanospheres for enhancing microwave attenuation. Zn(x)Fe(3-x)O4 hollow nanospheres were synthesized through a simple solvothermal process. The maximum magnetization moment of 91.9 emu/g can be obtained at x = 0.6. The composite filled with Zn0.6Fe2.4O4 exhibited the bandwidth of 3.21-8.33 GHz for RL < -10 dB and a maximum relative bandwidth (Wp,max) of 88.6% at optimized thickness t0 = 0.34 cm. The enhancement should be attributed to the enhanced permeability resonance at high frequency. This optimized hollow material is very promising to be used as a mass efficient and broadband microwave attenuation material.

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confidence: 58%

mentioning

confidence: 99%

Optimization of Zn_xFe_3–xO₄ Hollow Spheres for Enhanced Microwave Attenuation

Yang

et al. 2014

ACS Appl. Mater. Interfaces

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“…Generally, EM absorbers include magnetic materials and dielectric materials. The magnetic materials with high permeability depend on their magnetic properties to absorb EM waves such as nickel, iron, and their related based composites. , The dielectric materials with high dielectric constant rely on electronic polarization, molecular polarization, and surface polarization to attenuate EM waves such as silicon carbide (SiC), − multiwalled carbon nanotubes (MWCNT), graphene, and zinc oxide . Among them, SiC has triggered numerous interests due to its advantages in relative low density, chemical inertness, and outstanding thermal stability. − Carbon materials are also found to be potential EM absorbers owing to their excellent electrical property .…”

Section: Introductionmentioning

confidence: 99%

Controllable Fabricating Dielectric–Dielectric SiC@C Core–Shell Nanowires for High-Performance Electromagnetic Wave Attenuation

Liang

Wang

2017

ACS Appl. Mater. Interfaces

141

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Heterostructured dielectric-dielectric nanowires of SiC core and carbon shell (SiC@C) with high-performance electromagnetic wave absorption were synthesized by combining an interfacial in situ polymer encapsulation and carbonization process. This approach overcomes the shortcomings of previous reported methods to prepare carbon shell that both carbon shell and free carbon particles are formed simultaneously. In our developed approach, the core of SiC nanowires are first positively charged. Then the negative resorcinol-formaldehyde polymers as the carbon source are anchored on SiC nanowires under the attraction of electrostatic force, which well suppresses the nucleation of free carbon particles. The thickness of the carbon shell could be modulated from 4 to 20 nm by simply adjusting the moral ratio of resorcinol to SiC nanowires. The resulting SiC@C core-shell nanostructures without free carbon particles offer synergism among the SiC nanowires and the carbon shells, generating multiple dipolar polarization, surfaced polarization, and associated relaxations, which endow SiC@C hybrid nanowires with a minimum reflection loss (R) value of -50 dB at the frequency of 12 GHz and an effective absorption bandwidth of 8 GHz with R value under -10 dB at the optimized state. Our results demonstrate that SiC@C hybrid nanowires are promising candidates for electromagnetic wave absorption applications.

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“…A very good idea is to use soft magnetic ferrite to cover the ferromagnetic particles. The soft magnetic ferrites possess very high electrical resistivity and also have good magnetic characteristics, such as permeability and induction [ 16 , 17 , 20 , 21 , 22 ]. By combining the ferromagnetic particles with a dielectric layer formed by ferrites and the use of SPS for powder densification can be an intriguing approach.…”

Section: Introductionmentioning

confidence: 99%

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

et al. 2023

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Soft magnetic composite (SMC) cores have been obtained by Spark Plasma Sintering (SPS) using pseudo core–shell powders. Pseudo core–shell powders are formed by a core of soft magnetic particle (nanocrystalline permalloy or supermalloy) surrounded by a thin layer (shell) of nanosized soft ferrite (Mn0.5Zn0.5Fe2O4). Three compositions of pseudo core–shell powders were prepared, with 1, 2 and 3 w.t% of manganese–zinc mixt ferrite. The pseudo core–shell powders were compacted by SPS at temperatures between 500 and 700 °C, with a holding time ranging from 0 to 10 min. Several techniques have been used for characterization of the samples, both, powders and compacts X-ray diffraction (XRD, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), magnetic hysteresis measurements (DC and AC) and electrical resistivity. The electrical resistivity is in the order of 1 × 10−2 Ωm, 3–4 orders of magnitude higher than supermalloy electrical resistivity. The SPS at lower temperatures (500 °C) conserves the initial phases of the composite, but increasing the sintering temperature and/or sintering time produces a solid-state reaction between the alloy and ferrite phases, with negative consequence on the magnetic properties of the compacts. The initial relative permeability is around 40 and remains constant until to 2000 Hz. The power losses are lower than 2 W/kg until to 2000 Hz.

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Dielectric and magnetic properties of NiCuZn ferrite coated Sendust flakes through a sol–gel approach

Cited by 34 publications

References 19 publications

Optimization of Zn_xFe_3–xO₄ Hollow Spheres for Enhanced Microwave Attenuation

Optimization of Zn_xFe_3–xO₄ Hollow Spheres for Enhanced Microwave Attenuation

Controllable Fabricating Dielectric–Dielectric SiC@C Core–Shell Nanowires for High-Performance Electromagnetic Wave Attenuation

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

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Dielectric and magnetic properties of NiCuZn ferrite coated Sendust flakes through a sol–gel approach

Cited by 34 publications

References 19 publications

Optimization of ZnxFe3–xO4 Hollow Spheres for Enhanced Microwave Attenuation

Optimization of ZnxFe3–xO4 Hollow Spheres for Enhanced Microwave Attenuation

Controllable Fabricating Dielectric–Dielectric SiC@C Core–Shell Nanowires for High-Performance Electromagnetic Wave Attenuation

Producing Soft Magnetic Composites by Spark Plasma Sintering of Pseudo Core–Shell Ni–Fe Alloy@Mn0.5Zn0.5Fe2O4 Powders

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Optimization of Zn_xFe_3–xO₄ Hollow Spheres for Enhanced Microwave Attenuation

Optimization of Zn_xFe_3–xO₄ Hollow Spheres for Enhanced Microwave Attenuation