Features of Oxidation and Annealing of Iron Nanoparticles, Obtained by the EB-PVD Method on a Rotating Substrate
| Authors | V.O. Osokin1 , Ya.A. Stel’makh1 , Yu.A. Kurapov1 , S.E. Lytvyn1, G.G. Didikin1, P.O. Shpak2 |
| Affiliations |
1Paton Institute for Electric Welding, NASU, 03150 Kyiv Ukraine 2Institute for Carbon Nanomaterials, Ltd., 21036 Vinnytsya, Ukraine |
| Е-mail | kist2002@ukr.net |
| Issue | Volume 17, Year 2025, Number 2 |
| Dates | Received 02 December 2024; revised manuscript received 15 April 2025; published online 28 April 2025 |
| Citation | V.O. Osokin, Ya.A. Stel’makh, et al., J. Nano- Electron. Phys. 17 No 2, 02010 (2025) |
| DOI | https://doi.org/10.21272/jnep.17(2).02010 |
| PACS Number(s) | 81.15.Jj, 81.05. – t |
| Keywords | EB-PVD, Micro-layered composite materials, Nanoparticles (70) , Annealing (16) , Phase composition (3) , Microstructure (21) , Iron oxides, Thermogravimetric analyze, Dynamic lights scattering. |
| Annotation |
Microlayered composite materials (CM) containing nanoparticles of iron oxides have obtained by the method of electron-beam physical vapor and deposition in vacuum (EB-PVD) on a rotating substrate. The size of the particles of the obtained iron oxides in aqueous colloidal solvents/systems (CS), prepared from the obtained CM have determined. For the preparation of CS Fe3O4-H2O and Fe2O3-H2O used samples of microlayered CM NaCl-18.5 wt. % Fe, including made from just obtained CMs, after long-term exposure (607 days) and annealing in air at temperatures of 350 ºС and 650 ºС. The oxidation kinetics of the obtained microlayered CM NaCl-18.5 %wt. Fe have studied by the method of thermogravimetric analyses (TGA) in air. Structural transformations occurring during an annealing in air of microlayered CM NaCl-18.5 wt. %. Fe at the temperature of 350 С was determined the growth process of crystallites in layers with oxidation of the metal component of the iron layers to Fe3O4 magnetite with a size of particles 5-7 nm. Upon further heating to 650 С during the annealing in air in the studied CMs was noted the partial past-oxidation of magnetite Fe3O4 to hematite – α-Fe2O3 (up to 20 % by mass) due to physically adsorbed oxygen, with simultaneous recrystallization and growth of NaCl crystallites. The results of determining the sizes of Fe3O4 and Fe2O3 particles of the investigated CS H2O-Fe3(2)O4(3) at temperatures of 25-80 С by the method of dynamic lights scattering (DLS) have confirmed the stabilization of the dispersions degree of the obtained iron nanoparticles with the temperatures grow. In particular, the dispersion of the obtained CS, the parameters of the average hydrodynamic diameter of the particles and their index of polydispersity – have high values and a wide dispersion (interval), which characterizes them as polydisperse with the presence of particles aggregates. The results of the study of the phase composition, oxidation kinetics and residual magnetization of the studied CMs have confirmed the post-oxidation of iron in them, including due to physically adsorbed oxygen during the duration of storage and annealing in air. |
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List of References |
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