Hydroxy groups in high-purity glasses for fiber optics III: germanosilicate glasses

Victor G. Plotnichenko; V. O. Sokolov; Eugeni M. Dianov

doi:10.1117/12.385655

17 May 2000 Hydroxy groups in high-purity glasses for fiber optics III: germanosilicate glasses

Victor G. Plotnichenko, V. O. Sokolov, Eugeni M. Dianov

Proceedings Volume 4083, Advances in Fiber Optics; (2000) https://doi.org/10.1117/12.385655
Event: Advances in Fiber Optics, 2000, Moscow, Russian Federation

Abstract

We have investigated absorption band corresponding to the principal stretching vibration of hydroxyl (OH) groups in (GeO₂)_x(SiO₂)_1-x glasses with x <EQ 25 mol.% made by VAD and MCVD methods and by melting of GeO₂ and SiO₂ powders. The literature data have been analyzed and quantum-chemical calculations of various possible ways of OH groups embedded in the germanosilicate glass atomic network have been performed. OH groups are shown to occur in the investigated specimens mainly as silanol groups, equalsV Si-OH, concentration of equalsV Ge-OH groups being less than 5%. The maximum at 3600 cm^-1 of OH absorption band in germanosilicate glass usually ascribed to equalsV Ge-OH groups is supposed to be caused by equalsV Si-OH groups hydrogen-bonded with equalsV Ge-O-GeequalsV linkages and, probably, with equalsVSi-O-GeequalsV linkages. The apparent discrepancy of data for various specimens of germanosilicate glasses are explained by assumption that different conditions of manufacturing yield different degree of homogeneity of glass specimens. The shape and position of the absorption bands of OH stretching vibration in GeO₂- SiO₂ glasses are proposed as an additional criterion in homogeneity of glass and for technological control.

Citation Download Citation

Victor G. Plotnichenko, V. O. Sokolov, and Eugeni M. Dianov "Hydroxy groups in high-purity glasses for fiber optics III: germanosilicate glasses", Proc. SPIE 4083, Advances in Fiber Optics, (17 May 2000); https://doi.org/10.1117/12.385655

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