Vibrational Spectra Study of the Volatile Constitutions in the NaAlSi₃O₈ Glasses

Infrared and Raman spectroscopy has been used to measure the volstile components that dissolve in albitic （NaAlSi₃O₈） glasses quenched from a sol-gel melt at high pressures（20-55kbar） and temperatures （1350-1800℃）. The results show that the carbon dioxide is dissolved in the silicate melt predominantly as molecule CO₂, not CO₃^2- anion. We suggest that the 1550cm^-1 band （in Fig. 1 ） is the oxygen stretch vibrational band. Experiments show that the solubility of carbon dioxide, in the melt, increase and that of oxygen decrease with increasing pressures and temperatures.