Infrared and Raman spectroscopies were employed to investigate the influence of the thermal history on the structure of a low alkali borosilicate glass (NBS2) with the composition 0.74SiO2.0.21B2O30.04Na2O.0.01Al2O3. This glass is a model for technical glasses like Duran & Borofloat with similar low thermal expansion coefficients & high resistance to thermal shock. Previous studies including 11B-NMR spectroscopy established that the fraction of BO3 units in the ring formations is smaller in rapidly quenched samples as compared to annealed samples; whereas there is no change in the fraction of BO4- tetrahedra(O denotes a abridging oxygen atom). Samples were prepared for the present work at different melting temperatures (1650 to 1750 C) & different melt cooling temperatures (Tmc:250 to 700 C).
