Optical characterization of BK۷ borosilicate glasses containing different amounts of CeO۲

Borosilicate BK۷ glasses doped with different amounts of CeO۲ (۰.۵,۱,۱.۵%) were prepared by the convenient melting process in this work. DTA analysis proved that ۰.۵-۱% CeO۲ has a network modifier role and then up to ۱.۵% it shows network former role.For structural studies, FT-IR and Raman spectroscopy were carried out. Fermi energy level, direct/ indirect optical band gap and Urbach energy were determined by using UV-VIS spectra and calculating absorption and extinction coefficients.