Optical Characterization of BK7 Borosilicate Glasses Containing Different Amounts of CeO_2

Borosilicate bk7 glasses doped with different amounts of ceo_2 (0.5, 1, 1.5%) were prepared by the convenient melting process. to study structural changes of samples, fourier transfer infrared (ft- ir) and raman spectroscopy were employed. the differential thermal analysis (dta) results exhibited addition of 0.5% cerium oxide has reduced t_g and also, according to the urbach energy calculations, has made an enhancement in the disorderness of the glass network. actually by increasing nbos, ceo_2 played a glass modifier role. however, by adding 0.5-1.5% ceo_2, t_g increase and urbach energy decrease could be the results of ceo_2 network former role. the calculation of direct/indirect band gap energy and fermi energy level also indicated that by increasing the amount of dopant, the semiconducting characteristic of the glass became highlighted.