ПРЕКУРСОРЫ ОКСИДНЫХ СИСТЕМ AL2O3-ZRO2-DY2O3 И AL2O3-ZRO2-ND2O3, ПОЛУЧЕННЫЕ ЭЛЕКТРОХИМИЧЕСКИМ МЕТОДОМ

Abstract

The study is devoted to the preparation of precursors of complex oxide systems by electrochemical method based on the processes of anodic dissolution of aluminium in the electrolyte containing Cl-, NO3-, Al3+, Zr4+, Y3+, Dy (III), Nd (III) ions. The synthesis of precursors of complex oxide systems was carried out in a coaxial diaphragmless electrochemical reactor with substantially different area electrodes. The process of precursor formation proceeds in the volume of the electrochemical reactor due to the interaction of electrogenerated Al3+, OH- ions and electrolyte components. It is caused by hydrolysis of anode dissolution products, formation of polyheteronuclear metal-hydroxo-aqua complexes, their polycondensation, formation of primary particles of solid phase and enlargement of the latter. A comparative analysis of the particle size distribution of samples differing in the content of Dy2O3 and Nd2O3 demonstrates the bimodal character of the distribution, expressed more clearly in the case of the system containing Nd. The average particle size of the synthesised precursors is approximately in the same range, except for the system containing Nd and obtained from an electrolyte with a higher content of this element. The results of particle size measurements are confirmed by electron microscopy data. These data correlate with the time dependence of ξ-potential of synthesised precursors of alumina-zirconium oxide systems containing REE. The proposed approach allows to obtain precursors of complex oxide systems based on aluminium, zirconium, REE oxides. Using X-ray fluorescence and particle size analysis methods, the particle size and chemical compositions of precursors of oxide systems were investigated.