The structure and optical properties of GeO2-GeS2 glasses |
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Authors: | Nobuaki Terakado |
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Institution: | Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan |
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Abstract: | Oxy-chalcogenide glasses with compositions of xGeO2-(100 − x)GeS2, where 0 ? x ? 100 mol%, have been prepared and studied in terms of their structures and optical properties. X-ray fluorescence spectroscopy shows that Ge:S ratio can deviate from GeS2 by ∼10 at.%, depending critically upon the preparation conditions. Raman scattering spectroscopy suggests that stoichiometric GeO2-GeS2 glasses have a heterogeneous structure in the scale of 1-100 nm. The optical gaps are nearly constant at 3.0-3.5 eV for glasses with 0 ? x ? 80 mol% and abruptly increase to ∼6 eV in GeO2. This dependence suggests that the optical gap is governed by GeS2 clusters, which are isolated and/or percolated. Composition-deviated glasses appear as orange and brown, and these glasses seem to have more inhomogeneous structures. |
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Keywords: | 61 43 Fs 81 05 Kf |
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