二元钠硅酸盐玻璃及其熔体微结构的高温拉曼光谱及核磁共振研究

High Temperature Raman Spectra and MAS-NMR Studies of Binary Sodium Silicate Glasses and Melts

本文采用拉曼光谱研究不同配比的二元钠硅酸盐玻璃,结果显示碱金属阳离子的浓度影响结构中桥氧的含量,且不同初级结构Qi具有不同的特征峰。对Na2O·3SiO2玻璃进行高温拉曼和核磁共振研究,分别采用精细结构Qjklmi(m1h,m2q,m3t)和Qjklmi取代初级结构Qi进行解谱拟合和结构分析得到得到初级微结构单元的实际分布,结合量化分析结果计算其拉曼散射截面,定量分析Na2O·3SiO2玻璃及熔体在升温状态下结构随温度的变化。从室温到到熔态,Qi结构之间存在动态平衡,Na2O·3SiO2玻璃随着温度的升高从玻璃态到高弹态,最后经历粘流态到熔态。

Based on the Raman spectra of binary sodium silicate glasses with different propor- tion, the ratio of oxygen bridge in the structure was affected by the concentration of alkali i- ons, and the characteristic peaks of different primary structures Qi were presented. Both HT-Raman （High Temperature Raman） and NMR （nuclear magnetic resonance） were used for quantitative studies on Na2O · 3SiO2 glass and melt. Qi^jklm（m1h,m2q.m3,t） and Qi^jklm denoted as microstructure species instead of the primary Qi in Raman and NMR were used to identify and obtain accurate the distribution of microstructure species. The Raman scattering cross section was evaluated by the correlation with quantitative results. Thus, temperature dependent behavior of Na2O · 3SiO2 glass and melt could be observed and illustrated. Dynamic equilibrium between Qi species was existed in the temperature region up to its melt. Na2O · 3SiO2 glass transformed to the high elastic state from the glassy state, finally into the molten state through the viscous flow state.