Size dependence of magnetic properties of Fe, Co and Ni nanoparticles prepared by the chemical-metallurgical method using surfactants

Konyukhov, Yu. V.; Kamali, Saeed; Nguyên, Tiên Hiêp; Алымов, М. И.; Lileev, A. S.; Karpenkov, D.; Zakharova, Еlena V.

doi:10.1016/j.nanoso.2023.100943

Cited by 1 publication

(1 citation statement)

References 37 publications

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“…Hydrogen was synthesized using hydrogen gas generator GV-12 (Meta-Chrom, Russia) with a productiveness of 12 l•min -1 . Before starting heating and after annealing, the reactor was blown off by high-purity inert argon gas for cleaning from atmospheric air and passivation of the surface of the powder during cooling to room temperature forming a protective oxide film [21].…”

Section: Iron Powder Preparation By the Hematite Reduction In Hydrogenmentioning

confidence: 99%

Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique

et al. 2023

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The relationship between the chemical purity of one-size particles and microwave properties in ferromagnetic materials is not clearly studied. Ferromagnetic nanostructured iron powders were synthesized from iron nitrate solution using ultrasonic spray-pyrolysis and then reduced in H2 flow at 350, 400, 450, and 500 °C. A rise in the concentration of solutions of a precursor from 10 to 20 wt. % led to an increase in mean particle size. The interrelationship was studied between chemical composition and the microwave dispersion of the powders obtained. An increase in the temperature of reduction changes the chemical composition and increases the amplitude of complex microwave permeability, which was studied using solid-state physics methods (XRD, STA, SEM, and VNA). It was found that annealing at 400 °C is the optimal treatment that allows the production of iron powders, consisting of about 90% of α-Fe phase, possessing a particle surface with low roughness and porosity, and demonstrating intense microwave absorption. Annealing at a higher temperature (500 °C) causes an even higher increase in permeability but leads to the destruction of nanostructured spheres into smaller particles due to grain growth. This destruction causes an abrupt increase in permittivity and therefore significantly reduces potential applications of the product. The insight into chemical–magnetic relationships of these materials enhances the data for design applications in magnetic field sensing.

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Section: Iron Powder Preparation By the Hematite Reduction In Hydrogenmentioning

confidence: 99%

Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique

et al. 2023

View full text Add to dashboard Cite

show abstract

Size dependence of magnetic properties of Fe, Co and Ni nanoparticles prepared by the chemical-metallurgical method using surfactants

Cited by 1 publication

References 37 publications

Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique

Influence of Hydrogen Reduction Stage Conditions on the Microwave Properties of Fine Iron Powders Obtained via a Spray-Pyrolysis Technique

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