Doroshkevych О. Forming the nanostructures of ZrO2 -Y2O3 and Lа2O3-B2O3-GеO2-based oxide materials at thermal, baric and electromagnetic influences

The dissertation is devoted to establishment and study of the influence of complex action, such as the thermal annealing, weak pulsed magnetic fields - PMF and low vacuum on the processes of formaing the monolithic nanostructured 3D-materials from Lа2O3-B2O3-GеO2 (LBG) oxide glasses and coprecipitated nanopowders of ZrO2-Y2O3 - system. It has been revealed that the above physical factors result in changes of particles configuration of the dispersion phase. Basic factors determining the aggregate stability of ZrO2-based nanopowder disperse systems have been determined. By the methods of TEM, DТА, X-ray diffraction it has been discovered that the PMF intensifies crystallization in LBG-glass system, and homogenization of its spatial distributing in volume of glass-matrix. A possibility of obtaining a volume nanostructured state in LBG-glass and ZrO2-Y2O3 nanopowders through PMF has been suggested and experimentally grounded. It has been determined that for the oxide systems with gas- (ZrO2-nanopowders) and solid-phase (LaBGeO5-glass) dispersion environment the action of PMF is in intensification of the processes at every scale levels that is typical of this class of materials thus reducing the free energy of the dispersion system.