Temperature Dependence of the Raman Spectra of Na₂Si₂O₅

The microstructures of Na₂Si₂O₅ from room temperature up to 1773 K are studied by high temperature Raman spectroscopy. Deconvolutions of complex Raman spectra of crystal and amorphous states (glass and melt) are described. The results show that the temperature-dependent Raman spectra clearly indicate phase transition. Relative abundance of various kinds of SiO₄ tetrahedrons (each Si binding to different number of bridging oxygens) can be qualitatively and quantitatively resolved as to be varied obviously with different temperatures. It manifests that high temperature Raman spectroscopy provides a useful tool for the microstructure research under high temperature and helps to explain the properties of silicate glasses and melts.