Raman and Infrared Spectroscopy of Barium-Gallo Germanate Glasses Containing BO/TiO.

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-xTiO-30BaO-10GaO and (60-x)GeO-xBO-30BaO-10GaO (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. 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 (0.005 mol%). On the basis of Raman and FT-IR investigations, it was found that increasing the TiO content caused a destructive effect on the GeO and GeO structural units. The Raman spectra of a sample containing a predominantly TiO (50 mol%) proved that the band was located near 650 cm, which corresponded to the stretching vibration of Ti-O in TiO unit. The deconvoluted IR results showed that the germanate glass network consisted of the coexistence of two BO and BO 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.