<p>Modern advances in the technology of materials based on the Al₂O₃-Y₂O₃ system compounds allowed for the development of turbomachinery, scintillation materials science, as well as lighting and laser systems. Growing single crystals and ceramic composites from melt using methods characterized by weak convective mixing (e.g., horizontally directed crystallization) presents a number of difficulties that can be avoided during the feedstock preparation stage. The lack of information in the existing literature on the process of preparing monophasic, homogeneous, and high-density raw material for single-crystal growth prompted this paper. It addresses a wide range of issues: raw material selection (the possibility of using highly active nano-powders synthesized by wet chemistry methods is considered), factors influencing the solid-state synthesis process and ways to intensify the solid-state reaction of YAG formation, the choice of green body molding method, and potential ways to increase the relative density of the feedstock. This review is devoted to the assessment of the applicability and efficiency of some technological operations from ceramic technology, including the production of optical ceramics, in the production of monophasic YAG from commercial micro-sized oxide powders by solid-state synthesis.</p>