A Raman study of the ring defects in GeO2-SiO2 glasses

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The Raman spectra of GeO2-SiO2 glasses have been studied using samples of different GeO2 contents, which are found to have the general features of the spectrum of vitreous SiO2(v-SiO2). It is demonstrated that substitution of Ge for Si in the v-SiO2 network prevents the formation of ring structures. A new vibrational band located at 570-700 cm-1 was found in the spectra of high-GeO2-content samples (above 5.0 at.%GeO2). It is also shown that the W3 vibration of the v-SiO2 network is reduced in highly GeO2 doped GeO2-SiO2 glasses.