Optical Properties of TiO2-SiO2 Glass Over a Wide Spectral Range
Optical properties of vitreous SiO{sub 2} with 7.4 wt.% TiO{sub 2} are found by dispersion analysis of reflectivity measured in the infrared, visible, and ultraviolet augmented with literature values of vacuum-ultraviolet reflectivity and absorption. The principal infrared absorption associated with the titanium dopant occurs at 950 cm{sup -1} in a deep minimum of the host silica absorption. We attribute this to a perturbation of the silica's absorption at 1076 cm{sup -1} involving oxygen atoms bridging SiO{sub 4} and TiO{sub 4} tetrahedra. Strong ultraviolet absorptions of Ti{sup 4+} occur just below the silica exciton peak between 5.5 and 7.8 eV. We attribute these to charge-transfer transitions at TiO{sub 4} tetrahedra; i.e., bound excitons consisting of a Ti{sup 3+} ion and a hole shared by four oxygen neighbours.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 930409
- Report Number(s):
- BNL--81139-2008-JA
- Journal Information:
- Physica Status Solidi C, Journal Name: Physica Status Solidi C Journal Issue: 3 Vol. 4; ISSN 1610-1634
- Country of Publication:
- United States
- Language:
- English
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