Hydroxyl groups in germanosilicate glasses

摘要: Abstract The absorption band corresponding to the fundamental stretching vibration of hydroxyl (OH) groups in (GeO 2 ) x (SiO 1− glasses with ≲25 mol% made by VAD and MCVD methods melting GeO SiO powders is investigated; literature data are analysed quantum-chemical calculations various possible OH structures atomic network germanosilicate glass performed. shown occur investigated specimens mainly as Si–OH silanol groups, concentration Ge–OH being less than 5%. maximum at 3600 cm −1 usually ascribed supposed be caused hydrogen-bonded Ge–O–Ge Si–O–Ge linkages. apparent discrepancy available for explained assumption that different manufacturing conditions yield degree homogeneity specimens. shape position bands –SiO proposed an additional criteria technological control.