Cerium/aluminum correlation in aluminosilicate glasses and optical silica fiber preforms

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Cicconi MR, Neuville DR, Blanc W, Lupi JF, Vermillac M, de Ligny D
Zeitschrift: Journal of Non-Crystalline Solids
Verlag: ELSEVIER SCIENCE BV
Jahr der Veröffentlichung: 2017
Band: 475
Seitenbereich: 85-95
ISSN: 0022-3093


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.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Cicconi, Maria Rita Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
de Ligny, Dominique Prof. Dr.
Professur für Werkstoffwissenschaften (Glas und Keramik)


Einrichtungen weiterer Autorinnen und Autoren

National Center for Scientific Research / Centre national de la recherche scientifique (CNRS)
University of Côte d'Azur / Université Côte d'Azur


Zitierweisen

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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Zuletzt aktualisiert 2018-24-08 um 16:08