Abstract
The composition dependence of density (d), refractive index (n) and optical bandgap (Eg) of Ge-As-S chalcogenide glasses is investigated. It is shown that d correlates linearly with sulfur content but relatively poorly with the mean coordination number (MCN). It is also shown that n does not correlate directly with d, and instead a semi-empirical relation based on the molar refractivity (R) of Ge, As and S is derived, permitting to predict n from d with < 1% error. A convenient method based on diffuse reflectance is proposed to measure Eg of Ge-As-S glasses with good accuracy. It is shown that the value of Eg is dominated by the S content. These findings make it convenient to tailor the physical and optical properties of glasses in Ge-As-S system.
Original language | English (US) |
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Pages (from-to) | 38-42 |
Number of pages | 5 |
Journal | Journal of Non-Crystalline Solids |
Volume | 440 |
DOIs | |
State | Published - May 15 2016 |
Keywords
- Chalcogenide glasses
- Diffuse reflectance spectrum
- Optical bandgap
- Refractive index
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry