Optical Properties of K2O-Li2O-WO3-B2O3 Glasses: Evidence of Mixed Alkali Effect
| Autor: | Syed Rahman, Avula Edukondalu, Shaik Kareem Ahmmad, K. Sivakumar, T. Sripathi |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Single oscillator Absorption spectroscopy Solid-state physics Band gap Analytical chemistry Mineralogy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Absorption edge 0103 physical sciences Dispersion (optics) Materials Chemistry Mixed alkali effect Electrical and Electronic Engineering 0210 nano-technology Refractive index |
| Zdroj: | Journal of Electronic Materials. 46:808-816 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-016-4949-8 |
| Popis: | Glass with compositions xK2O-(30 − x)Li2O-10WO3-60B2O3 for 0 ≤ x ≤ 30 mol.% have been prepared using the normal melt quenching technique. The optical reflection and absorption spectra were recorded at room temperature in the wavelength range 300–800 nm. From the absorption edge studies, the values of the optical band gap (E opt) and Urbach energy (ΔE) have been evaluated. The values of E opt and ΔE vary non-linearly with composition parameter, showing the mixed alkali effect. The dispersion of the refractive index is discussed in terms of the single oscillator Wemple Di-Domenico model. |
| Databáze: | OpenAIRE |
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