Physical and Structural Studies of (30-x) BaO-xAl2O 3-69.5B 2 O3 - 0.5MnO2 Glasses

Abstract

(30-x) BaO-xAl₂O₃-69.5B₂O₃-0.5MnO₂ (0 ≤ x ≤ 15 mol%) (BABM) glasses have been prepared using melt quench method.  In the present work, the main focus on the role of Al₂O₃ in the glass composition. Differential scanning calorimeter (DSC) studies show that a glass transition temperature (T_g) decreases with an increase of Al₂O₃ content which was explained on the basis of NBO’s. The FTIR spectra exhibit to know BO₃ and BO₄ structural units, band assignments confirms Ba²⁺, Mn-O and bending vibration of Al-O in [AlO₄]. The Raman band at~786 cm^-1 has clearly shown the presence of aluminium bond.  It has been found that an increasing the Al₂O₃ content increases the bond length of the Al-O bond in AlO₄ which leads to an increase in molar volume and decrease density.