Transmission electron microscopy, Raman scattering, Fourier transform infrared spectroscopy, and radio-luminescence are employed to investigate rare-earth (RE) incorporation and aggregate formation in silica glasses prepared by the Sol-Gel method and doped with Ce3+, or Tb3+, Gd3+, Yb3+ with concentrations up to several mol%. The results demonstrate that rare-earth aggregates with a mean diameter extending up to several tens of nanometers occur, further increasing their size after post-den-sification high temperature treatments. Rare-earth segregation causes a reduction of the OH content of glasses. Nanoclusters are amorphous, possibly close to a (RE)2SiO3 stoichiometry. Room temperature radio-luminescence measurements reveal that the emission spectra are dominated by RE3+ emissions and no bands due to silica matrix defects are detected. © 2010 IEEE.
Vedda, A., Chiodini, N., Fasoli, M., Lauria, A., Moretti, F., DI MARTINO, D., et al. (2010). Evidences of rare-earth nanophases embedded in silica using vibrational spectroscopy. IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 57(3), 1361-1369 [10.1109/TNS.2010.2044420].
Evidences of rare-earth nanophases embedded in silica using vibrational spectroscopy
VEDDA, ANNA GRAZIELLA;CHIODINI, NORBERTO;FASOLI, MAURO;LAURIA, ALESSANDRO;MORETTI, FEDERICO;DI MARTINO, DANIELA;
2010
Abstract
Transmission electron microscopy, Raman scattering, Fourier transform infrared spectroscopy, and radio-luminescence are employed to investigate rare-earth (RE) incorporation and aggregate formation in silica glasses prepared by the Sol-Gel method and doped with Ce3+, or Tb3+, Gd3+, Yb3+ with concentrations up to several mol%. The results demonstrate that rare-earth aggregates with a mean diameter extending up to several tens of nanometers occur, further increasing their size after post-den-sification high temperature treatments. Rare-earth segregation causes a reduction of the OH content of glasses. Nanoclusters are amorphous, possibly close to a (RE)2SiO3 stoichiometry. Room temperature radio-luminescence measurements reveal that the emission spectra are dominated by RE3+ emissions and no bands due to silica matrix defects are detected. © 2010 IEEE.
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