The asymmetric and broadening of Raman ban around the main peak in symmetric stretching vibration region are mainly caused by the variant of secondary-structure in various microenvironments.

• 硅氧四面体对称伸缩振动区的主峰不对称以及展宽主要是由于一系列具有不同为环境下的二级结构的变化造成的。