Properties of Bismuth-Containing High-Silica Glass Depending on the Bismuth Concentration and Heat Treatment. I. Spectral-Optical Properties

摘要

Bismuth-containing high-silica glass is synthesized by impregnating porous glass matrices in 0.01-0.5 M aqueous solutions of bismuth nitrate with the subsequent heat treatment at a temperature of 50-875 degrees C. The dependences of the spectral-optical properties of the synthesized glass on the concentration of the doped bismuth (0.02-1.17 wt % Bi2O3) and heat treatment temperature are studied. It is found using the method of optical spectroscopy that bismuth is present in glass in different oxidation states-Bi3+, Bi2+, and Bi-5(3+) clusters. Near infrared spectroscopy in the 7500-4000 cm(-1) frequency range reveals that an increase in the temperature results in a gradual decrease in the intensity of the absorption bands due to the vibration of hydroxyl groups and water molecules adsorbed on the surface. The glasses (T similar to 50 and 400 degrees C) exhibit bands at 4445-4443, 4433, and 4417-4415 cm(-1), which correspond to the absorption of Bi+ ions.