Electrometallurgy Today, 2022, №02



2022 №02 (02)

DOI of Article 10.37434/sem2022.02.03

2022 №02 (04)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2022, #2, 17-26 pages

Dispersity and magnetic properties of magnetite nanoparticles produced by the method of molecular beam condensation

Yu.A. Kurapov, S.E. Lytvyn, G.G. Didikin, V.V. Boretskyi

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., Kyiv, 03150, Ukraine. E-mail: office@paton.kiev.ua

Abstract
The paper gives the results of investigation of iron nanoparticles in condensates of 10…43 wt. % Fe–NaCl system, produced by electron beam evaporation and simultaneous condensation of Fe and NaCl molecular beams in vacuum (EB-PVD method). Transmission electron microscopy, X-ray phase analysis, dynamic light scattering and vibration magnetometry were used to study the structure and dimensions of nanoparticles in Fe–NaCl condensates, their phase and chemical composition, and magnetic properties. Size of Fe3O4 nanoparticles in the condensates, depending on their synthesis temperature, and nanoparticle crystallite size were determined, depending on iron concentration in the condensates. The influence of the quantity of iron in the condensates on the size of nanoparticle crystallites is shown. According to X-ray phase analysis, the size of Fe3O4 crystallites in the concentration range of 2…15 at. % Fe is within 3…14 nm, and in the range of 20…30 at. % Fe it is equal to 17…22 nm. Average size of Fe3O4 crystallites (8…15 nm) produced at substrate temperature of 45 °C, increases to 25…40 nm with increase of substrate temperature (410 °С). It should be noted that in the nanoparticles the pure iron phase is revealed at more than 20 at. % Fe content in the condensate. It was proved that the condensation temperature can be regarded as a reliable factor for regulation of particle size in the technological process. The distribution of hydrodynamic size of Fe3O4 nanoparticle aggregates in water colloids with dextran was studied. Increase of saturation magnetization and coercive force of Fe–NaCl condensates with magnetite nanoparticles at increase of iron content was determined. Ref. 21, Tabl. 1, Fig. 7. Key words: electron beam physical vapour deposition (EB-PVD); porous condensate; microstructure; nanoparticles; condensation temperature; phase composition; crystallites; aggregates
Received 18.04.2022

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