Abstract
Recent vibrational studies suggest that vitreous SiOz2 contains a modest concentration (∼2 percent) of small highly regular rings of bonds. This evidence is reviewed, and a simple model is developed that successfully predicts the existence of such rings. The model is then used to estimate the probability of occurrence of similar regular rings in several other AX2 tetrahedral glasses, including BeF2, GeO2, GeS2, GeSe2, SiS2, SiSe2 and ZnCI2. These predictions are supported by the appearance of anomalous sharp lines in the Raman spectra of the glasses, and some of these Raman spectra are presented in the paper. Most interesting is the prediction that v-GeO2 contains a large concentration of nearly planar 3-rings, an element of intermediate range order not seen in the crystalline forms of GeO2 and not included in earlier structural models for the glass.
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Galeener, F.L. (1985). A Model for Predicting the Occurrence of Regular Rings in AX2 Tetrahedral Glasses. In: Adler, D., Fritzsche, H., Ovshinsky, S.R. (eds) Physics of Disordered Materials. Institute for Amorphous Studies Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2513-0_14
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DOI: https://doi.org/10.1007/978-1-4613-2513-0_14
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