铌硼酸盐玻璃分相与TiO2的作用

关于铌硼酸盐玻璃的分相。以前研究的很少,最近,我们采用SAXS、LAXS、RTEM等技术,研究了铌硼酸盐玻璃分相的结构和动力学特征。发现玻璃分相特征为成核——生长型,其分散相粒子长大过程服从于扩散控制机制;玻璃产生的SAXS散射强度表明在其母相与分散相粒子间的电子密度差是足够高的。这是因为分相后,分别形成了富B₂O₃和富Nb₂O₅的织构相所致。本文着重介绍了铌硼酸盐玻璃加入TiO₂后玻璃形成特点和光学常数变化规律,最后,依据实验结果讨论了玻璃中的Nb⁵⁺和Ti⁴⁺离子结构状态。

Phase Separation and the Role of TiO2 in the Nioboborate Glasses

A little work has been done for phase separation of nioboborate glasses Recently, by means of SAXS, LAXSand RTFM, the morphology and kinetic characteristcs of the phase separated nloboborate glass have been investigated. The nucleation and growth mechanism have been found with the appearing of the second phase dispersed particles. The growth rule obyes to the diffusion-controled mechanism. The fact of producing the intensive SAXS in glass shows that the difference of electron aensity between the matrix phase and second phase particles is suffcient high. That is attributed to the presence of rich B₂O₃ and rich Nb₂O₅ phase in the glass respectively. In this paper a great attention has also been paid to introduce the feature of glass forming and the regularity of the change of optical constant with adding TiO₂ in the nioboborate glasses. Finally, on the basis of experimental results, the structure state of Nb⁵⁺ and Ti⁴⁺ ions in the glasses will be discussed.