New methods of modified ceramic technology for synthesis of functional nanostructured systems
This review demonstrates the possibilities of aerosol pyrolysis and spray drying methods, after their modification, for the synthesis of non-agglomerated nanoparticles of multicomponent oxides with sizes in the range of 10 - 100 nm. The role in this synthesis of substances NaCl, Na2SO4, KCl, BaB2O4, which do not participate in the synthesis reaction, is shown. In doing so, they form an inert matrix that isolates the crystallization centers from each other. Thus, the intensity of recrystallization processes during heat treatment of nanopowders is suppressed with an increase in their crystallinity without a significant increase in size. A method of thermal vibration milling and equipment for combining the operations of mixing, grinding and firing during the synthesis of powders of multicomponent oxides are proposed. In the case of its use, the temperature ranges of the formation of the reaction products are shifted, and metastable phases appear. The reasons for the increase in the efficiency of solid-phase processes in this case are established.