xCaSiO3·LiBO2固溶体中硅氧四面体微结构形态的拉曼光谱研究

本文测定了xCaSiO3*LiBO2(重量比,x=0, 0.25, 0.33, 0.50)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 提供了可能.

Raman Spectroscopic Study of Silicon-oxygen Tetrahedrons Microstructure in x CaSiO3·LiBO2 Solid Solutions

Raman spectra of xCaSiO3.LiBO2 (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-Ob-B bondings or free SiO4(4-). No evidence suggests that there exist considerable Si-Ob-Si bondings. The abundance of Q2, Q4 species increases with the increasing silica content, there exists barely Q3 species even at high silica content. And the sum of integrated Raman peaks for all Qi species are linearly correlated with silica concentration in crystal, which offers the possibility to analysis silica in minerals, slags, glasses and soil samples directly.