Optical and structural investigation on sodium borosilicate glasses doped with Cr2O3

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2018-02, Vol.190, p.534-538
• Main Authors: Ebrahimi, E., Rezvani, M.
• Format: Article
• Language: English
• Subjects: Borosilicate glasses; Optical filter; Optical properties
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2017.09.031

In this work, Sodium borosilicate glasses with chemical composition of 60% SiO2–20% B2O3–20%Na2O doped with different contents of Cr2O3 were prepared by melting-quenching method. Physical, structural and optical properties of glasses were investigated by studying density and molar volume, Fourier Transform Infrared (FT-IR) Spectra and UV–visible absorption spectroscopy. The results showed an increase in density of glasses with the increase of Cr2O3 that can be due to addition of oxide with high molar mass. The optical absorption spectra of un-doped glass reveals UV absorption due to trace iron impurities with no visible band however Cr2O3 doped glasses shows absorption in visible range that are characteristic. Increasing of Cr3+ ions in the glassy microstructure of samples provides a semiconducting character to Sodium borosilicate glass by reducing the direct and indirect optical band gaps of glass samples from 3.79 to 2.59 (ev) and 3.36 to 2.09 (ev), respectively. These changes could be attributed to the role of Cr3+ ions as the network former which asserts improvement of semiconducting behavior in presence of Cr2O3. [Display omitted] •Glass samples containing Cr2O3 additive were prepared by melting-quenching method.•FT-IR results proved the creation of BOs and network former function of Cr3+ ions.•Decreasing in fermi energy, revealed the improvement of semi conducting property.•Optical bandgap decreased in presence of Cr2O3 due to increasing BO4 units.