Crystalline and electronic structures of nanoalumina alone and in different mixtures with nanosilica have been analyzed using X-ray diffraction (XRD) and ultrasoft X-ray emission spectroscopy (USXES).
Narrowing of the OK bands of crystalline alumina occurs with decreasing nanoparticle size. Electron transfer from oxygen to aluminum atoms due to Al-O bond breakage under irradiation leads to occupation of high-energy 3d level of Al. In nanoparticles, the Al-O bond strength and O-O interactions enhanced by Laplace (bubble) pressure lead to phase stabilizing if coherent-scattering region size (d CSR )reaches 7 nm which is smaller than that for phase of alumina and silica/alumina studied. The d CSR values are in agreement with nanoparticle sizes calculated using self-consistent regularization method applied to nitrogen adsorption data.
The analysis of morphological characteristics of nanoscale structures x-Al2O3 + y-SiO2 (x = 0,2; 0,3; 0,75; y = 0,8; 0,7; 0,25) before and after mechanical activation is hold. During the investigation of spot chemical composition is was revealed that as the consequence of mechanical activation in the structure of composites agglomerates are formed where nanoparticles of silicon and aluminum oxides are present simultaneously. The changes of the structure of morphology are confirmed by the redistribution of valence Ор-, Sisd- та Alsd electrons mixtures as a result of mechanical activation.
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