Influence of Mechanical Treatment on Structural and Morphological Characteristics and Distribution of Valence Electrons of Aluminum, Silicon, Iron and Titanium Oxides

Authors Yu.V. Yavorsky1 , Ya.V. Zaulichny1 , V.M. Gunko2 , M.V. Karpets3

1National Technical University of Ukraine "Igor Sikorsky Kiev Polytechnic Institute", Faculty of Engineering and Physics, 35, Politechnichna Str., 03056 Kyiv, Ukraine

2National Academy of Sciences of Ukraine. Institute of Surface Chemistry named after. O. Chuika, 17, General Naumova Str. 17, 03164 Kyiv, Ukraine

3National Academy of Sciences of Ukraine, Institute of Problems of Materials Science named after. Frantsevich, 3, Academician Krzhyzhanovsky Str., 03680 Kyiv, Ukraine

Issue Volume 10, Year 2018, Number 6
Dates Received 14 August 2018; revised manuscript received 07 December 2018; published online 18 December 2018
Citation Yu.V. Yavorsky, Ya.V. Zaulichny, V.M. Gunko, M.V. Karpets, J. Nano- Electron. Phys. 10 No 6, 06005 (2018)
PACS Number(s) 62.23.Pq, 71.20.Nr
Keywords γ-Fe2O3 (2) , α-Fe2O3, SiO2 (5) , Al2O3 (2) , TiO2 shock-vibration treatment, Energy redistribution, Ultra soft x-ray emission spectroscopy, Phase composition (3) , Cogeneration scattering region.

Using the method of X-ray diffraction analysis, the impact of shock-vibration treatment on structural parameters and phase composition of γ-Fe2O3, α-Fe2O3, SiO2, Al2O3 and TiO2 was studied. With the aid of scanning electron microscopy, a change in the morphological characteristics of nanosized powders was established. The influence of the shock-vibration method on the distribution of valence electrons is investigated by the method of ultra soft X-ray emission spectroscopy. In this paper, the relationship between the change in the population of electron states in the valence band and structural and morphological peculiarities is scientifically related. Comparing images of powdered oxides of silicon, titanium, aluminum and iron before and after SVT, it was found that as a result SVT of Si, Ti, Al and Fe oxides, the change in the distribution of nanoparticles due to the accumulation occurs but there is no consolidation and aggregation into grains and structured agglomerates . The aggregation of TiO2 and Al2O3 particles and the change in the phase ratio in γ-Fe2O3 oxide after SVT are due to the fact that these starting materials consist of several phases of one oxide with the different position of Fermi level. Therefore, their chemical potentials also differ. This means that we do the shock-vibration treatment of mixtures of two nanosized powder with different chemical potentials, which can be accompanied by greater particle bonding or a change in phase ratio. The observed narrowing of the OKa- and FeLa-bands due to SVT of α-Fe2O3 is the result of partial degradation in the Fed+Op states at the discontinuity of ionic-covalent bonds during the grinding of nanoparticles, which is observed at SVT, indicating a decrease in the area of coherent dispersion and decrease sizes of agglomerates in SEM images.

List of References