Precursors of Al2O3–ZrO2–LnxOy Oxide Systems Obtained Using Electrogenerated Reagents

Scientific principles for the synthesis of precursors of nanostructured oxide systems Al₂O₃–ZrO₂–Ln_xO_y ((Ln = Dy, Nd) are developed. The features of their formation under conditions of rapid mixing of electrogenerated reagents, implemented in a diaphragm-free coaxial reactor-electrolyzer, are studied. The methods of potentiodynamic polarization curves, X-ray diffractometry, X-ray fluorescence, synchronous thermal analysis, and laser diffraction are used to study the anodic processes occurring in the electrolyzer, the morphology of particles formed in the solution and transformed during heat treatment, as well as the phase, granulometric, and elemental compositions of precursors and oxide systems. The proposed approach allows obtaining oxide systems modified with rare earth elements based on the Al₂O₃–ZrO₂ binary system, characterized by the presence of a stabilized phase of tetragonal zirconium dioxide. REE atoms present in the studied systems—Nd and Dy—stabilize t-ZrO₂ and, apparently, occupy the positions of crystal lattice nodes, isomorphically replacing Zr⁴⁺. The latter is indicated by the broadening of the corresponding reflections of X‑ray diffraction patterns. It indirectly indicates the presence of microstresses in the microcrystals of the phases. The latter can be caused by distortions of the crystal lattices of aluminum and zirconium oxides as a result of the substitution of metal atoms by REE atoms.