Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

Cao, Ying; Yang, Bai; Yang, Xueying; Zhang, Lei; Li, Rongfeng; Yu, Rong

doi:10.1007/s10948-015-2980-2

Cited by 13 publications

(13 citation statements)

References 32 publications

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“…49-1568) can be obviously seen. 28 No oxidation peaks shown in the XRD patterns demonstrate good air stability of these FeCo powder products. However, for FeCo@SiO 2 , the Fe-Co alloy particles diffraction peaks have been strong in composites.…”

Section: Resultsmentioning

confidence: 93%

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO₂ and their enhanced electromagnetic absorption properties

Huang

Zhang

et al. 2018

Journal of Composite Materials

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The FeCo@SiO2/holey reduced graphene oxide composite was successfully prepared by combining liquid-phase reduction reaction in argon atmosphere with high-temperature calcination. The FeCo@SiO2/holey reduced graphene oxide composite was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, vibrating sample magnetometer, Fourier transform infrared spectroscopy, Raman spectroscopy, transmission electron microscopy and scanning electron microscopy analysis and exhibit excellent electromagnetic wave absorption properties. The maximum reflection loss of FeCo@SiO2/holey reduced graphene oxide composite reaches –46.28 dB at 16.16 GHz with the thickness of 1.5 mm and the absorption bandwidth with the reflection loss below –10 dB was up to 3.92 GHz (from 14.08 GHz to 18 GHz) with the thickness of 1.5 mm. The absorption bandwidth with RL below –10 dB is up to 12.64 GHz. It is believed that the FeCo@SiO2/holey reduced graphene oxide composite can serve as an excellent microwave absorber.

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Section: Resultsmentioning

confidence: 93%

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO₂ and their enhanced electromagnetic absorption properties

Huang

Zhang

et al. 2018

Journal of Composite Materials

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“… 29 , 30 Noteworthy, the N 2 generated during the reaction could protect the formed FeCo against oxidization. 33 …”

Section: Resultsmentioning

confidence: 99%

One-Step Room-Temperature Synthesis of Bimetallic Nanoscale Zero-Valent FeCo by Hydrazine Reduction: Effect of Metal Salts and Application in Contaminated Water Treatment

et al. 2022

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The effect of initial salt composition on the formation of zero-valent bimetallic FeCo was investigated in this work. Pure crystalline zero-valent FeCo nanoparticles (NPs) were obtained using either chloride or nitrate salts of both metals. Smaller NPs can be obtained using nitrate salts. Comparing the features of the FeCo prepared at room temperature and the solvothermal method revealed that both materials are almost identical. However, the room-temperature method is simpler, quicker, and saves energy. Energy-dispersive X-ray (EDX) analysis of the FeCo NPs prepared using nitrate salts at room temperature demonstrated the absence of oxygen and the presence and uniform distribution of Fe and Co within the structure with the atomic ratio very close to the initially planned one. The particles were sphere-like with a mean particle size of 7 nm, saturation magnetization of 173.32 emu/g, and surface area of 30 m 2 /g. The removal of Cu 2+ and reactive blue 5 (RB5) by FeCo in a single-component system was conformed to the pseudo-first-order and pseudo-second-order models, respectively. The isotherm study confirmed the ability of FeCo for the simultaneous removal of Cu 2+ and RB5 with more selectivity toward Cu 2+ . The RB5 has a synergistic effect on Cu 2+ removal, while Cu 2+ has an antagonistic effect on RB5 removal.

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“…In particular, 5N or higher purity cobalt is needed for contact layer applications in integrated circuits. [1][2][3][4][5][6][7] To produce 5N or higher purity cobalt in an electrorefining process, one of the challenges is to effectively reduce the Fe content of aqueous cobalt salt solution before electrolysis. Chemical precipitation and solvent extraction are methods often employed to remove iron from cobalt salt solutions.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, 5N or higher purity cobalt is needed for contact layer applications in integrated circuits. 1–7…”

Section: Introductionmentioning

confidence: 99%

A thermodynamic and kinetic study of trace iron removal from aqueous cobalt sulfate solutions using Monophos resin

Wang

Zhao

Yang

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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home/jbf high temperature and high pressure conditions and produces iron precipitates, which are difficult to separate from solutions. With solvent extraction, a general problem is emulsification, which causes loss of extractant and contamination of electrolyte. In addition, both chemical precipitation and solvent extraction methods are not able to Abstract Background: High purity cobalt has many important applications, such as magnetic recording media, magnetic recording heads, optoelectronic devices, magnetic sensors, and integrated circuits, etc. To produce 5N or higher purity cobalt in an electro-refining process, one of the challenges is to effectively reduce the Fe content of aqueous cobalt salt solution before electrolysis. This paper describes thermodynamic and kinetic investigations of the Fe adsorption process of a new sulfonated monophosphonic resin with the trade mark Monophos. Methods: Five cobalt sulfate solutions of different Co concentrations were prepared. Fe ions were removed from the solutions by ion exchange method using Monophos resin. Chemical analysis was carried out using a Perkin Elmer ICP-OES. Results: The initial Fe concentrations of about 0.9-2.0 mg/L can be reduced to about 0.3-0.8 mg/L, which is equivalent to an Fe removal rate of 60-67%. The Langmuir isothermal adsorption model applies well to the Fe removal process. A second-order type based on McKay equation fits better with experimental data than other kinetic models. The kinetic curve can be divided into two sections. For t < 30 min, particle diffusion may act as the controlling step, whereas chemical reaction may control the Fe adsorption process in the section t > 30 min. Conclusions: Monophos resin is effective for the removal of trace Fe from cobalt sulfate solution. This ion exchange process obeys the Langmuir isothermal adsorption model and the McKay equation of second-order kinetics.

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Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

Cited by 13 publications

References 32 publications

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO₂ and their enhanced electromagnetic absorption properties

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO₂ and their enhanced electromagnetic absorption properties

One-Step Room-Temperature Synthesis of Bimetallic Nanoscale Zero-Valent FeCo by Hydrazine Reduction: Effect of Metal Salts and Application in Contaminated Water Treatment

A thermodynamic and kinetic study of trace iron removal from aqueous cobalt sulfate solutions using Monophos resin

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Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

Cited by 13 publications

References 32 publications

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO2 and their enhanced electromagnetic absorption properties

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO2 and their enhanced electromagnetic absorption properties

One-Step Room-Temperature Synthesis of Bimetallic Nanoscale Zero-Valent FeCo by Hydrazine Reduction: Effect of Metal Salts and Application in Contaminated Water Treatment

A thermodynamic and kinetic study of trace iron removal from aqueous cobalt sulfate solutions using Monophos resin

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Synthesis of holey reduced graphene oxide covered in the FeCo@SiO₂ and their enhanced electromagnetic absorption properties

Synthesis of holey reduced graphene oxide covered in the FeCo@SiO₂ and their enhanced electromagnetic absorption properties