【摘要】 Ca-MgO-Al₂O₃-SiO₂-P₂O₅-F系统具有较强的二液分离倾向。本工作在考查了P₂O₅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P₂O₅对该系统玻璃中Si-O键的强度和[SiO₄]的聚合程度的影响。研究表明,随着玻璃中P₂O₅含量的增加,[SiO₄]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,P₂O₅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。更多还原

【Abstract】 Glasses in CaO-MgO-Al₂O₃-SiO₂-P₂O₅-F system have a strong tendency to phase separation, and the effect of P₂O₅ upon the phase separation has been studied before. In this paper, the influence of P₂O₅ 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 P₂O₅ content, the [SiO₄] 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 SiO₂. These results indicate that the polymerization degree of [SiO-4] and the strength of Si-O bonding are increased with increasing P₂O₅ content. The study also shows the P₂O₅ effect upon the Si-O bond- ing is related with the phase separation caused by the introduction of P₂O₅ into the glasses.更多还原