The total structure factors, S ( Q ), obtained from high-energy x-ray and neutron diffraction measurements on vitreous SiO 2 (v-SiO 2 ) and vitreous GeO 2 (v-GeO 2 ) have been analysed by the reverse Monte Carlo (RMC) modelling technique to generate a three-dimensional structural model. The bond angle distributions and the ring size distributions from the model indicated that the sixfold ring and six- and sevenfold rings are dominant in v-SiO 2 and v-GeO 2 , respectively. However, the fraction of threefold rings of Ge in v-GeO 2 is larger than that of Si in v-SiO 2 glass. These features are consistent with the published neutron diffraction and Raman scattering studies.
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Kohara et al. (2005) studied this question.
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