Impact of bridging oxygens formation on optical properties of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 glasses

A. Faeghinia

doi:10.53063/synsint.2022.2179

A. Faeghinia ¹

¹ Ceramic Department, Materials and Energy Research Center (MERC), P.O. Box 31779-83634, Karaj, Iran

https://doi.org/10.53063/synsint.2022.2179

Abstract

In this study, the structural chemistry of Fe³⁺ doped Li₂O–Al₂O₃–SiO₂–TiO₂ (LAST) glasses has been analyzed utilizing UV-Vis spectroscopy. Optical parameters like absorption and extinction coefficients, indirect and direct optical band gaps, Urbach energy as well as Fermi energy level of samples were estimated via their absorption spectra. Then, it was tried to make a relationship between the variation of mentioned parameters and structural chemistry of different doped samples. Results of the investigation illustrated that even a little change in the microstructure of glassy samples has an effect on optical parameters and accordingly it could be sensible. Furthermore, it was revealed that Fe³⁺ ions have the role of network forming in the structure of glass by increasing the formation of bridging oxygens (BOs) in the matrix.

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Keywords: UV-Vis absorption spectra, Glass, Short-range order, Bridging oxygens formation, Optical parameters, Structural chemistry

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