Raman and Infrared Spectroscopy of Barium-Gallo Germanate Glasses Containing B 2 O 3 /TiO 2 .

Modified barium gallo-germanate glass hosts are still worthy of attention in studying structure-property relationships. In this work, two different series of glass systems based on (60-x)GeO 2 -xTiO 2 -30BaO-10Ga 2 O 3 and (60-x)GeO 2 -xB 2 O 3 -30BaO-10Ga 2 O 3 (x = 10, 30, 50 mol%) were synthesized, and their properties were studied using spectroscopic techniques. X-ray diffraction (XRD) patterns revealed that all fabricated glasses were fully amorphous material. The absorption edge shifted toward the longer wavelengths with a gradual substitution of GeO 2 . The spectroscopic assignments of titanium ions were performed with excitation and emission spectra compared to the additional sample containing an extremely low content of TiO 2 (0.005 mol%). On the basis of Raman and FT-IR investigations, it was found that increasing the TiO 2 content caused a destructive effect on the GeO 4 and GeO 6 structural units. The Raman spectra of a sample containing a predominantly TiO 2 (50 mol%) proved that the band was located near 650 cm -1 , which corresponded to the stretching vibration of Ti-O in TiO 6 unit. The deconvoluted IR results showed that the germanate glass network consisted of the coexistence of two BO 3 and BO 4 structural groups. Based on the experimental investigations, we concluded that the developed materials are a promising candidate for use as novel glass host matrices for doping rare-earth and/or transition metal ions.