Optical Properties of [(TeO<sub>2</sub>)<sub>0.7 </sub>(B<sub>2</sub>O<sub>3</sub>)<sub>0.3</sub>]<sub>1-x</sub> (Bi<sub>2</sub>O<sub>3</sub>)<sub>x</sub> Glass System
Azuraida AmatMohamed Kamari HalimahNurazlin Ahmad
Abstract
Ternary tellurite based glasses [(TeO 2 ) 0.7 (B 2 O 3 ) 0.3 ] 1-x (Bi 2 O 3 ) x was prepared by melt quenching method with suitable melting and quenching temperature. A series of glasses were selected from 0.05 to 0.30 mol % and its glass-forming region was determined. The density, molar volume and refractive index increase when bismuth ions Bi 3+ increase, this is due to the increased polarization of the ions Bi 3+ and the enhanced formation of non-bridging oxygen (NBO). The values of optical band gap, E opt decreases when Bi 2 O 3 content increases. Urbach energy for each composition was also calculated and was found to be dependent on the glass composition.
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