| Autor: |
Guithi, K., Sekrafi, H. E., Kharrat, A. Ben Jazia, Khirouni, K., Boujelben, W. |
| Zdroj: |
Journal of Optics (09728821); Sep2023, Vol. 52 Issue 3, p1494-1506, 13p |
| Abstrakt: |
In this work, we investigate the structural and optical properties of the LiNbO3 compound. The sample is prepared using the solid–solid (LN1) and sol–gel (LN2) methods. The obtained compounds were characterized by X-ray diffraction, UV–Vis and IR spectroscopy. X-ray diffraction analysis using Rietveld refinement shows that all our samples are single-phase and crystallize in the rhombohedral structure with the R 3 ¯ c space group. The UV–Vis measurements, performed from 200 to 2400 nm, show a direct and wide optical band-gap evaluated by reflectance measurements at (4.90 ± 0.02) eV and (4.24 ± 0.02) eV for LN1 and LN2, respectively. The estimation of the Urbach energy shows a lower value for LN1 which confirms the high quality of the sol–gel prepared sample. In addition, the evolution of the extinction coefficient (ke) and the refractive index n with the wavelength were determined. Furthermore, we have demonstrated that n obeys to Cauchy relation. Some other optical parameters such as the skin depth and the optical conductivity were calculated. The infrared (IR) spectra described different modes of stretching and vibration related to the functional groups that exist in the samples. The obtained encouraging results prompt us to propose this compound as a basic material for optoelectronic devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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