Formation of Alkoxy-derived Yttrium Aluminates in the Al₂O₃-rich Region

抄録

Hexagonal YAIO₃ crystallizes at low temperatures from an amorphous material prepared by the simultaneous hydrolysis of yttrium and aluminum alkoxides. It transforms to the cubic phase with a garnet structure as an intermediate product at elevated temperatures. The formation process of YAlO₃ is described. Solid solutions of hexagonal YAlO₃ crystallize between 50 and 62.5 mol% Al₂O₃. Yttrium aluminum garnet, Y₃Al₅O₁₂ (YAG), is formed by the transformation of the hexagonal YAlO₃ solid solution.