Spectroscopic and mechanical studies of lithium aluminoborate glasses doped with chromium ions
- Al-Azhar University, Girls Branch, Department of Physics, Faculty of Science (Egypt)
Aluminoborate glasses, doped with chromium ions, were prepared using melt quenching technique. Spectroscopic and mechanical tools were utilized to study the impact of B{sub 2}O{sub 3} substitution with Al{sub 2}O{sub 3} on the structure of the glass system. Infrared spectra uncovered that substitution of B{sub 2}O{sub 3} with Al{sub 2}O{sub 3} causes concealment of non-bridging oxygen NBOs and creation of inflexible AlO{sub 4} tetrahedral. The UV–Vis absorption spectra demonstrated a blue-shift of the optical absorption edge with increasing Al{sub 2}O{sub 3} content. The optical band gap was found to increase, while the refractive index diminished with addition of Al{sub 2}O{sub 3} content. The calculated crystalline field Dq, Racah parameters (B and C) and Dq/B indicated the diminishment in inter-electron repulsion with increasing the covalency. In particular, a value of Dq/B larger than 2.3 assures that chromium ions are in strong ligand field sites. The elastic moduli increase with increasing Al{sub 2}O{sub 3} content, due to the reduction NBOs and, consequently, the increased average bond connectivity.
- OSTI ID:
- 22950174
- Journal Information:
- Optical and Quantum Electronics, Vol. 51, Issue 8; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 0306-8919
- Country of Publication:
- United States
- Language:
- English
Similar Records
Investigation of Spectral Properties of Potassium Aluminoborate Glasses Doped with Chromium
Polyhedral arrangements in lanthanum aluminoborate glasses