How is Bismuth(3+) tris[oxido(oxo)aluminium] (CAS: 12284-76-3) typically synthesized?

Bismuth(3+) tris[oxido(oxo)aluminium] can be synthesized through the reaction of bismuth trioxide with aluminium oxide in a controlled atmosphere. The synthesis typically requires a high-purity starting material, and the process is carried out at elevated temperatures. Commonly, this synthesis is conducted in an inert gas environment to prevent unwanted side reactions. The yield and selectivity can be optimized by adjusting the reaction conditions and using appropriate catalysts.