Abstract
SiO 2–BaO–ZnO–xB 2O 3–(10−x) Y 2O 3, (0 ≤ x ≤ 10) glasses are synthesized. The effect of Y 2O 3 on the structural and optical properties of glasses has been investigated using different characterization techniques. The results are discussed in light of non-bridging oxygens (NBO), optical basicity and heat-treatment of glasses. The band gap has been calculated for as cast and heat-treated glasses. The band gap energy is found to decrease with the increasing content of Y 2O 3 in the glasses and heat-treatment. The presence of the crystalline phase in the glass matrix showed remarkable effect on band gap which decreases to semiconducting range.
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