Abstract
We examined the effects of bismuth (III) oxide (Bi2O3) on the optical properties of glass. The glass samples were prepared with high-pressure sodium lamp glass as the initial material with different concentrations of Bi2O3. Optical properties such as the refractive index, optical band gap, Urbach energy, polarisability and metallisation were investigated. The results indicated that addition of Bi2O3 into the network structures of the glass samples increased the formation of non-bridging oxygen atoms. This resulted in a decrease of the optical band gap and an increase in the polarisability of the glass samples. The types of electron transitions were studied by comparison between the differential method and the Davis and Mott model. The results showed that the electrons moved directly by an allowed transition.
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