Cerium/aluminum correlation in aluminosilicate glasses and optical silica fiber preforms
Cicconi MR, Neuville DR, Blanc W, Lupi JF, Vermillac M, de Ligny D (2017)
Publication Status: Published
Publication Type: Journal article
Publication year: 2017
Journal
Publisher: ELSEVIER SCIENCE BV
Book Volume: 475
Pages Range: 85-95
DOI: 10.1016/j.jnoncrysol.2017.08.035
Abstract
Optical, structural properties and redox were studied for Ce-bearing silicate and aluminosilicate glasses and Ceactivated silica (SiO2) fiber preforms, by X-ray Absorption, Raman and Photoluminescence Spectroscopy.The introduction of Al2O3 in Ce-bearing silicate glass strongly stabilizes reduced species in agreement with the optical basicity concept and additionally induces modifications in the Ce3+ surrounding. In Al-free silica preforms, depending on the collapsing conditions, the Ce3+/Sigma Ce ratio has the highest variability (Ce3+/Sigma Ce = 0.7-0.85 +/- 0.07), whereas in Al-bearing fiber preforms, Al codoping induces a strong stabilization of Ce3+ species, despite the collapsing atmosphere.Al presence induces modifications on Ce local environment, and thus variations of the distance between Ce3+ and its ligands, and/or to variations of the covalency of the bonds. Absorption bands in the UV region, ascribed to Charge-transfer (CT) bands, in our samples, occur only for low amount of Ce4+ (Ce3+/Sigma Ce > 0.85 +/- 0.07). Indeed, in silicate and aluminosilicate glasses the higher amount of Ce4+ does not give rise to UV absorption bands ascribed to CT processes, whereas, in fiber preforms, Ce3+ species can induce the trapping of hole centers, and enhance the photoluminescence efficiency. More generally, these results enhance our understanding of REE structural and chemical roles in amorphous materials and increase our knowledge for technical applications.
Authors with CRIS profile
Maria Rita Cicconi
Lehrstuhl für Glas und Keramik
Dominique de Ligny
Professur für Werkstoffwissenschaften (Glas und Keramik)
Involved external institutions
University of Côte d'Azur / Université Côte d'Azur
France (FR)
National Center for Scientific Research / Centre national de la recherche scientifique (CNRS)
France (FR)
France (FR)
National Center for Scientific Research / Centre national de la recherche scientifique (CNRS)
France (FR)
How to cite
APA:
Cicconi, M.R., Neuville, D.R., Blanc, W., Lupi, J.-F., Vermillac, M., & de Ligny, D. (2017). Cerium/aluminum correlation in aluminosilicate glasses and optical silica fiber preforms. Journal of Non-Crystalline Solids, 475, 85-95. https://dx.doi.org/10.1016/j.jnoncrysol.2017.08.035
MLA:
Cicconi, Maria Rita, et al. "Cerium/aluminum correlation in aluminosilicate glasses and optical silica fiber preforms." Journal of Non-Crystalline Solids 475 (2017): 85-95.
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