Vanadyl doped Li-zinc borate glasses: Optical and ESR study
| Autor: | H.M. Mokhtar, A. Samir, M. Farouk, Z. M. Abd El-Fattah |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Quenching (fluorescence) Zinc borate Infrared Doping Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Amorphous solid law.invention chemistry.chemical_compound Tetragonal crystal system chemistry law 0103 physical sciences Materials Chemistry Ceramics and Composites Fourier transform infrared spectroscopy 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | Journal of Non-Crystalline Solids. 568:120964 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2021.120964 |
| Popis: | Glasses with the composition xV2O5-(15-x) Li2O-70B2O3-15ZnO, for x varies from 0 to 4 mol. %, were synthesized using standard quenching technique. The amorphous nature for selected samples (x= 0, 1 and 4 mol. %) was ensured from X-ray diffraction (XRD) measurements. The samples were found to compose mainly from BO3 and BO4 basic structural units as inferred from Fourier transform infrared (FTIR) data. The number of BO4 (BO3) structural units was found to decrease (increase) with increasing the number of NBOs. These structural modifications within the glass network are responsible for the here observed composition dependence optical energy gap (Eotp) and Urbach band tail (ΔE). The electron spin resonance (ESR) results revealed a tetragonal compression for VO2+ ions present in octahedral coordination, with distinct optical transitions in the visible spectral regime. |
| Databáze: | OpenAIRE |
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