A thorough study was performed on Gd-doped sol-gel silica glasses, in the concentration range 0-8 mol% Gd. The analyses were carried out as a function of Gd content, before and after a post-densification thermal treatment. Different results concerning optical, vibrational, magnetic, and structural features were gathered in correlated experiments. The presence of Gd-rich nanoclusters was revealed. The size of nanoclusters increases by increasing the dopant concentration and by performing a rapid thermal treatment (RTT) at 1800 °C in air, which causes also a remarkable intensity increase of the <sup>6</sup>P<sub>7/2</sub> →<sup>8</sup>S<sub>7/2</sub> radioluminescence transition of Gd<sup>3+</sup>. Nanoclusters are amorphous, possibly close to a Gd<sub>2</sub>SiO<sub>5</sub> stoichiometry as suggested by fast Fourier transform infrared spectroscopy (FTIR). FTIR studies revealed also the presence of Gd-dimers interacting with OH<sup>-</sup> groups. Moreover, the presence of isolated Gd<sup>3+</sup> ions was detected by electron paramagnetic resonance investigations. Based on the results obtained with different techniques, the Gd-incorporation in silica glass host and the resulting optical properties are discussed. © 2008 Elsevier B.V. All rights reserved.

DI MARTINO, D., Chiodini, N., Fasoli, M., Moretti, F., Vedda, A., Baraldi, A., et al. (2008). Gd-incorporation and luminescence properties of sol-gel silica glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 354(32), 3817-3823 [10.1016/j.jnoncrysol.2008.05.027].

Gd-incorporation and luminescence properties of sol-gel silica glasses

DI MARTINO, DANIELA;CHIODINI, NORBERTO;FASOLI, MAURO;MORETTI, FEDERICO;VEDDA, ANNA GRAZIELLA;
2008

Abstract

A thorough study was performed on Gd-doped sol-gel silica glasses, in the concentration range 0-8 mol% Gd. The analyses were carried out as a function of Gd content, before and after a post-densification thermal treatment. Different results concerning optical, vibrational, magnetic, and structural features were gathered in correlated experiments. The presence of Gd-rich nanoclusters was revealed. The size of nanoclusters increases by increasing the dopant concentration and by performing a rapid thermal treatment (RTT) at 1800 °C in air, which causes also a remarkable intensity increase of the 6P7/28S7/2 radioluminescence transition of Gd3+. Nanoclusters are amorphous, possibly close to a Gd2SiO5 stoichiometry as suggested by fast Fourier transform infrared spectroscopy (FTIR). FTIR studies revealed also the presence of Gd-dimers interacting with OH- groups. Moreover, the presence of isolated Gd3+ ions was detected by electron paramagnetic resonance investigations. Based on the results obtained with different techniques, the Gd-incorporation in silica glass host and the resulting optical properties are discussed. © 2008 Elsevier B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
sol-gel, clusters, silica
English
2008
354
32
3817
3823
none
DI MARTINO, D., Chiodini, N., Fasoli, M., Moretti, F., Vedda, A., Baraldi, A., et al. (2008). Gd-incorporation and luminescence properties of sol-gel silica glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 354(32), 3817-3823 [10.1016/j.jnoncrysol.2008.05.027].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/6454
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