xCaSiO_3·LiBO_2固溶体中硅氧四面体微结构形态的拉曼光谱研究

Raman Spectroscopic Study of Silicon-oxygen Tetrahedrons Microstructure in x CaSiO_3·LiBO_2 Solid Solutions

本文测定了xCaSiO3 ·LiBO2 (重量比 ,x =0 ,0 2 5 ,0 33,0 5 0 )系列的拉曼光谱 ,分析了硅氧四面体的微结构形态及其随SiO2 浓度的变化。结果表明 ,在所研究的浓度范围内 ,其微结构单元 ,即Qi(i =0 ～4)均以孤立的硅氧四面体存在 ,且随SiO2 浓度的增加 ,Q2 ,Q4 的丰度有明显增加 ;此外 ,硅氧四面体的伸缩振动谱峰的积分强度总和与SiO2 浓度呈线性相关 ,为采用拉曼光谱直接分析矿物、炉渣、玻璃和土壤中的SiO2

Raman spectra of xCaSiO 3·LiBO 2 (by weight ratio, x = 0, 0.25, 0.33, 0.50)crystals were measured. The microstructure of different silicon-oxygen tetrahedrons and their abundant variations with silica contents were studied. It shows that all the silicon-oxygen tetrahedrons are isolated by Si-O b-B bondings or free SiO 4- 4.No evidence suggests that there exist consiclerable Si-O b-Si bondings. The abundance of Q 2, Q 4 species increases with the increasing silica content, there exists barely Q 3 species even at high silica content. And the sum of integrated Raman peaks for all Q i species are linearly correlated with silica concentration in crystal, which offers the possibility to analysis silica in minerals, slags, glasses and soil samples directly.