CaO-MgO-Al2O3-SiO2-P2O5-F玻璃中Si-O键性研究

A STUDY ON THE Si—O BONDING IN CaO-MgO-Al2O3-SiO2-P2O5-F GLASSES

Ca-MgO-Al_2O_3-SiO_2-P_2O_5-F系统具有较强的二液分离倾向。本工作在考查了P_2O_5对该系统玻璃分相的作用的基础上,进一步根据红外光谱和拉曼光谱的变化以及X射线荧光光谱中SiK_β线的化学位移,深入探讨了P_2O_5对该系统玻璃中Si-O键的强度和[SiO_4]的聚合程度的影响。研究表明,随着玻璃中P_2O_5含量的增加,[SiO_4]四面体中的非桥氧逐渐减少,同时SiK_β线逐渐向低能方向位移,玻璃中Si-O键不断增强。研究还表明,P_2O_5对玻璃中Si-O键的这种影响是与它使玻璃产生分相密切相关的。

Glasses in CaO-MgO-Al_2O_3-SiO_2-P_2O_5-F system have a strong tendency to phase separation, and the effect of P_2O_5 upon the phase separation has been studied before. In this paper, the influence of P_2O_5 upon the Si-O bond in the glasses is investigated by means of infra-red(IR), Raman and X-ray fluorescence(XRF) spectra. The study shows that when increasing the P_2O_5 content, the [SiO_4] vibrational bands in IR and Raman spectra change from lower polymerized mode to higher polymerized one, and the Si K_β band in XRF spectra of the glasses moves towards that of SiO_2. These results indicate that the polymerization degree of [SiO-4] and the strength of Si-O bonding are increased with increasing P_2O_5 content. The study also shows the P_2O_5 effect upon the Si-O bond- ing is related with the phase separation caused by the introduction of P_2O_5 into the glasses.