Effects of particle morphology and crystal structure on the microwave properties of flake-like nanocrystalline Fe3Co2 particles

Zhou, Pei Heng; Deng, Liangliang; Xie, Jianliang; Liang, Difei

doi:10.1016/j.jallcom.2006.10.061

Cited by 68 publications

(39 citation statements)

References 12 publications

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“…Micro-, submicro-and nanoparticles, ribbons, thin films of the RE-Co compounds exhibiting moderate and high coercivities have been produced by various techniques, including ball-milling, pulse electrodeposition, spark erosion, melt-spinning and magnetron sputtering [2][3][4][5][6][7][8]. The use of surfactants during ball milling influences not only the size of the particles, but also their shape [9][10][11]. High-aspect-ratio flakes with a submicron thickness of some malleable metals and alloys, such as Ni, Cu, Fe-Co, Fe-Co-Zr, Fe-Si-Al, Sn-Ag-Cu, have been fabricated by high-energy ball milling (HEBM) in the presence of a solvent and/or surfactants [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Formation of SmCo5 single-crystal submicron flakes and textured polycrystalline nanoflakes

2011

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Section: Introductionmentioning

confidence: 99%

Formation of SmCo5 single-crystal submicron flakes and textured polycrystalline nanoflakes

2011

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“…The optimized parameters of the CA pattern are: l = 8.0 mm, w = 0.3 mm, d and g are adjustable, and the thickness t n = 0.002 mm consistent with our experimental conditions. In our experiments, the magnetic absorbing sheet was prepared on the basis of epoxy resin filled with FeCo alloy powders at the weight ratio of 1:9 by blending, roll mixing, and vulcanizing [14,15]. The complex EM parameters (as shown in Fig.…”

Section: Designmentioning

confidence: 99%

Ultra-thin wideband magnetic-type metamaterial absorber based on LC resonator at low frequencies

et al. 2015

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In this paper, we propose to realize a broad absorption band in the frequency regimes of 2-6 GHz based on multiple resonances. A magnetic-type metamaterial absorber with cross-arrow pattern is further demonstrated numerically and experimentally. Two absorption resonances are generated by LC resonance, leading to bandwidth expansion. The equivalent circuit theory and the surface current distributions of the proposed absorber are discussed to analyze the physical mechanism. Moreover, the broad bandwidth can be maintained as incident angle up to 30°for transverse electric polarization and 45°for transverse magnetic polarization. Finally, experimental results show that the proposed absorber with the total thickness of 2.4 mm exhibits a -10 dB absorption bandwidth by more than 70 %. The low-frequency absorber has potential applications in the area of eliminating microwave energy.

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“…Using the aforesaid CIPs as raw material, the irregular iron particles are formed at =0 by dry grinding without the addition of absolute alcohol, with 13 µm in mean diameter and rough surface coated by a mass of flaked nanoparticles (Figure 1 The above phenomena can be interpreted as followings: In general, the high-performance milling used is a combination of the microforging, fracturing, and cold welding of iron powders, with the help of the grinding balls' gravity and squeezing pressure from their high-speed rotation [8]. Hereinto, the role of the microforging is to flatten the powder.…”

Section: The Morphology Dependence On Liquid-solid Ratiomentioning

confidence: 99%

“…More recently, it is found that the flake-shape magnetic particles take on higher permeability compared with the isotropy magnetic particles. For instance, Zhou et al [8] chiefly attributed the improved permeability and multi-resonant behavior of flake-like Fe 3 Co 2 nanocrystallines to the enhancement of superexchange coupling and the surface anisotropy. However, Deng et al [9] believed that natural resonance and exchange energy played a key role in two resonance phenomena of FeCoNi flake composite.…”

mentioning

confidence: 99%

Effect of liquid-solid ratio on the morphology, structure, conductivity, and electromagnetic characteristics of iron particles

Tong

Qiao

et al. 2011

Sci. China Technol. Sci.

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Using a ball-milling technique, polymorphous iron particles were prepared by changing only the liquid-solid ratio . Effects of  on their morphology, structure, conductivity, and electromagnetic properties were studied. The results show that an increase of  from 0 to 0.25 causes a nonlinear decrease of the conductivity in the ranges of 88.502.25 S cm 1 and a regular variation of the electromagnetic parameters, corresponding to the as-obtained iron particles. This is ascribed to a combination of the increased shape anisotropy and the decreased fresh surface with active atoms deriving from the weakened welding-on action and the enhanced micro-malleation action in the ball-milling process. Hereinto, the iron flakes formed at wet-milling with =0.080.25 have lower conductivity, higher permittivity and permeability, and more excellent absorption property compared with the irregular iron particles obtained at dry-milling with =0. It is a consequence of the synergistic effect of dielectric relaxation loss, exchange energy and conductance loss originating from the flake-shape structures. This indicates that the morphology, structure, conductivity, and electromagnetic properties of the products can be effectively controlled by changing .iron flake, liquid-solid ratio, conductivity, microwave electromagnetic property Citation:Tong G X, Hua Q, Wu W H, et al. Effect of liquid-solid ratio on the morphology, structure, conductivity, and electromagnetic characteristics of iron particles.

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Effects of particle morphology and crystal structure on the microwave properties of flake-like nanocrystalline Fe3Co2 particles

Cited by 68 publications

References 12 publications

Formation of SmCo5 single-crystal submicron flakes and textured polycrystalline nanoflakes

Formation of SmCo5 single-crystal submicron flakes and textured polycrystalline nanoflakes

Ultra-thin wideband magnetic-type metamaterial absorber based on LC resonator at low frequencies

Effect of liquid-solid ratio on the morphology, structure, conductivity, and electromagnetic characteristics of iron particles

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