Titanates, zirconates, aluminates and ferrites as waste forms for actinide immobilization

Titanate, zirconate, mixed titanate zirconate phases with fluorite and fluorite-related structures, and aluminate and ferrite phases with perovskite and garnet structures are surveyed. These phases are promising hosts for immobilization of actinides and their lanthanide analogues present in nuclear wastes. The data on the chemical stability and radiation resistance of the ceramics based on the above-mentioned phases demonstrating reliability of long-term storage of ceramized actinide wastes are presented. Methods for the synthesis of ceramics using sintering and melting stages are considered. The cold crucible inductive melting is shown to be one of the most promising techniques.