期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 354, 期 32, 页码 3817-3823出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2008.05.027
关键词
nanoclusters; optical properties; silica; rare-earths in glasses
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 degrees C in air, which causes also a remarkable intensity increase of the P-6(7/2) -> S-8(7/2) radio-luminescence 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 Gd 31 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. (c) 2008 Elsevier B.V. All rights reserved.
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