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. The relative abundance of various kinds of SiO₄ tetrahedrons (each Si binding to different numbers of bridging oxygens) can be qualitatively and quantitatively resolved as to be varied obviously with different temperatures. This shows that high-temperature Raman spectroscopy provides a useful tool for microstructure research under high temperature and helps to explain the properties of silicate glasses and melts.