STRUCTURES OF CEO2-AL2O3-SIO2 GLASSES

Structures of glasses containing (20-30) mol% CeO2-(16-23) mol% Al2O3- (47-64) mol% SiO2 prepared at 1550 degrees C for 3 h in an atmosphere of N-2 have been investigated via the analyses of FT-IR and Al-27 MAS- NMR spectroscopy. Results show that cerium ions act primarily as the g lass modifiers. The number of NBO/T on average in the structures of CA S glasses increases with increasing ceria content. The aluminum ions i n the structures of CAS glasses exist in both Al(6) and Al(4) coordina tion, and the fraction of Al(6) is more than Al(4).