The spectroscopic studies of glasses in the BPO4(GaPO4)-SiO2 system

FTIR spectroscopic structural studies of gel-derived glasses in BPO4-SiO2 and BPO4(GaPO4)-SiO2 systems are presented. B-10 isotope substitution, spectra subtraction procedure and B3+ --> Ga3+ substitution were applied to distinguish the bands, originating from B-O, P-O and Si-O bond vibrations. The spectra of borophosphosilicate glasses containing B-10 isotope have also been presented. Changes in the band positions helped to assign bands due to the different B-O bonds vibrations. The spectra subtraction procedure, due to the lowering of intensity of bands assigned to Si-O bonds vibrations, enabled to observe bands at 966 and 1225 cm(-1), due to broken Si-O- bridges and (PO2)(-). terminal groups, respectively. (C) 2002 Elsevier Science B.V. All rights reserved.