Characterization of CeO₂–Al₂O₃–SiO₂ glasses by infrared and x-ray absorption near edge structure spectroscopies

Structural characteristics of CeO₂–Al₂O₃–SiO₂ glasses have been studied by infrared and x-ray absorption near edge structure (XANES) spectroscopies, and the Kramers-Kronig analysis of IR reflection data was performed. Results of IR spectra show that ceria is the network modifier and favors the formation of [SiO₄] tetrahedron with nonbridging oxygens. The high frequency Si–O–Si stretching vibrational peak near 1100 cm⁻¹ shifts toward the lower frequency as ceria content increases and alumina content is constant. XANES data of the cerium LIII edge show that the majority of cerium ions in cerium aluminosilicate glasses are Ce³⁺ ions. The ratio of Ce⁴⁺/Ce³⁺ increases with increasing the ratio of Ce/(Al + Si). However, the ratio of Ce⁴⁺/Ce³⁺ decreases with increasing the ratio of Al/(Al + Si).