Affiliation:
1. Tomsk State University of Control Systems and Radioelectronics
Abstract
Changes in the diffuse reflectance spectra (∆ρλ) and integral absorption coefficient (Δаs) in the range of 0.2–2.5 µm were studied after modification of zinc oxide powders with few µm particles (mZnO) via own nZnO nanoparticles of various concentrations in the range of 0.1–10.0 wt %. A decrease in the reflection coefficient (ρ) in the range of 0.4–1.0 µm and its increase in the range of 1.0–2.5 µm in the modified mZnO/nZnO powders was established. Electron irradiation (Е = 30 keV, F = 2 × 1016 cm–2) of mZnO, nZnO, and mZnO/nZnO powders with different concentrations of nanoparticles showed that the optimal concentration of nanoparticles is 5 wt %. The radiation stability of the modified powder at this concentration increased by a factor of 2.95, the radiation stability of a nanopowder is more than 2 times higher than that of a powder with particles a few microns in size. When irradiated with electrons all three types of powders form their own point defects, which absorb in the visible region, and free electrons, which absorb in the near-IR region.
Publisher
The Russian Academy of Sciences
Reference21 articles.
1. Нещименко В.В. Исследование структуры, свойств и радиационной стойкости оксидных порошков, модифицированных наночастицами: Дис. д-ра физико-математических наук: 01.04.07. Томск: ИФПМ, 2017, 325 с.
2. Brown R.R., Fogdall L.B. Cannaday S.S. // Prog. Astronautics: Thermal Design Principles of Spacecraft and Entry. 1969. V. 21. P. 697.
3. Heydari V., Bahreini Z. // J. Coat. Technol. Res. 2018. V. 15. P. 223.
4. Mastan R., Khorsand Zak A., Pilevar Shahri R. // Ceram. Int. 2020. V. 46. P. 8582.
5. Chen H., Li P., Zhou H. // Mater. Res. Bull. 2022. V. 146. P. 111572.