Vereschak V. Physical and Chemical Fundamentals and Technology of Nanosized Stabilised Zirconia Powders.

The dissertation is devoted to creation of physical and chemical theory and technology of nanosized stabilized zirconia powders produced from water solutions of non-organic zirconium (IV) salts containing stabilizing dopants. It is established that due to their orientational and dimensional conformity the tetra-dimensional hydrocomplexes existing in soluble zirconiumflV) salts are the basis for formation of zirconia fluorite-like fore-structures in a solid state, reactions are chemical processes, which determine intercation and agglomeration of panicles along all the chain of transformations as follows: Zr(IV) water solution + Me(III) - intermediate product - solid zirconia. To retain stabilized zirconia in nanosized structure state, technological processing of zirconium (IV) solutions must be directed of optimal organization of synthesis reaction zone, its localization in the less as possible volumes - drop, micela. sol. colloid. Being based on the above data, the producing processes of nanosized stabilized zirconia powders with direct processing of zirconium (IV) water solutions inlow temperature plasma, low temperature hydrolysis at contact non-equilibrium plasma and co-deposition of components were established and investigated. The data of this research is put as a basement of advanced technological processes to produce nanosized stabilized zirconia powders. Key words: zirconium dioxide, hydrocomplex, nanosized. plasma, stabilized, precipitation, aggregation