Gamma ray irradiation-induced variations in structure and optical properties of cerium/titanium-doped oxyfluoride transparent glass-ceramics
- College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054 (China)
- Science and Technology on Thermostructural Composites Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072 (China)
Highlights: • CeO{sub 2} favors CaF{sub 2} crystallization while TiO{sub 2} suppresses CaF{sub 2} crystallization. • Doping TiO{sub 2} helps reduce intrinsic coloring caused by CeO{sub 2}. • Doping CeO{sub 2} and/or TiO{sub 2} improves defects saturation over irradiation does. • Doping CeO{sub 2} allows lower radiation induced absorption coefficient than co-doping CeO{sub 2}/TiO{sub 2}. - Abstract: CeO{sub 2}/TiO{sub 2}-doped oxyfluoride transparent glass ceramics with a composition of 45SiO{sub 2}–20Al{sub 2}O{sub 3}–10CaO–25CaF{sub 2} were synthesized and irradiated by gamma ray. The effects of CeO{sub 2}/TiO{sub 2} on the structure and optical properties of the samples before and after irradiation were investigated. Doping with CeO{sub 2} causes network depolymerization and conversion of [AlO{sub 6}] to [AlO{sub 4}], enlarging the percolation region and promoting CaF{sub 2} crystallization. Co-doping with CeO{sub 2}/TiO{sub 2} helps reduce the intrinsic coloring of transparent glass ceramics containing only CeO{sub 2}, and the addition of TiO{sub 2} enhances network interconnectivity, suppressing CaF{sub 2} crystallization. Doping with CeO{sub 2} and/or TiO{sub 2} improves the structural stability of transparent glass ceramics upon irradiation and maintains the optical band gap and Urbach energy constant due to the defect saturation over the irradiation dose. Doping solely with CeO{sub 2} allows for a lower radiation-induced absorption coefficient than co-doping CeO{sub 2}/TiO{sub 2} because of the enhanced crystallization induced by CeO{sub 2} and balanceable light absorption of polyvalent cerium ions.
- OSTI ID:
- 22730375
- Journal Information:
- Materials Research Bulletin, Vol. 92; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Transparent oxyfluoride glass ceramics co-doped with Er{sup 3+} and Yb{sup 3+} - Crystallization and upconversion spectroscopy
Crystallization and spectroscopic properties investigations of Er{sup 3+} doped transparent glass ceramics containing CaF{sub 2}