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 glass modifiers. The number of NBO/T on average in the structures of CAS glasses increases with increasing ceria content. The aluminum ions in the structures of CAS glasses exist in both Al(6) and Al(4) coordination, and the fraction of Al(6) is more than Al(4).