Medium range order in sodium silicate glasses: role of the network modifier

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• 作者：Chemarin ; C. ; Champagnon ; B.
• 关键词：61.43 ; 78.66 ; 78.30 ; A140 ; R110 ; S440
• 刊名：Journal of Non-Crystalline Solids
• 出版年：1999
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：February, 1999
• 卷：243
• 期：2-3
• 页码：281-284
• 文件大小：99.7 K

摘要

The effect of different concentrations of the network modifier Na₂O on the position of the Boson peak, observed in the low frequency Raman scattering experiments, is analyzed. Glasses containing 25%Na₂O (Na₂O · 4SiO₂) and 33%Na₂O (Na₂O · 2SiO₂) are compared with pure SiO₂ glass. The observed shift of the Boson peak is interpreted in terms of a change of a correlation length, ℓ, corresponding to some medium range order. This length, ℓ, decreases when the amount of sodium oxide increases.