The study is devoted to the preparation of precursors of complex oxide systems based on Al2O3-ZrO2 by an electrochemical method based on the processes of anodic dissolution of Al and coprecipitation of Al3+, Zr4+, Y3+, Ce3+ and La3+ ions in the presence of electrogenerated OH- ions. The synthesis was carried out in a coaxial diaphragmless electrochemical reactor with significantly different electrode areas, followed by the formation of primary particles through hydrolysis, polycondensation and crystallization. The phase and elemental compositions of precursors of complex oxide systems Al2O3-ZrO2-MxOy (M = La, Ce, Y, Mg) were investigated using X-ray diffractometry and X-ray fluorescence analysis method. The analysis of the obtained oxide systems revealed that the presence of Ce3+ and Mg2+ ions leads to the appearance of cerium oxide Ce2O3 and MgAl2O4, as well as the preservation of high-temperature modification of zirconium dioxide t-ZrO2. The presence of La3+ and Y3+ leads to complex oxides such as La2Zr2O7 and YZrO2, apparently stabilizing the c-ZrO2 phase at high temperatures. The proposed electrochemical method of synthesis allows to obtain precursors of complex oxide systems based on aluminum and zirconium, characterized by the presence of tetragonal and cubic phase of zirconium dioxide, which in turn contributes to the expansion of the range of methods for obtaining new promising materials and materials with improved properties, the structure of which is determined to a large extent by the phase composition of the initial oxide systems.
Хайруллина et al. (Sun,) studied this question.