FTIR spectroscopy was applied in the 500-14,000cm-1 range to detect OH vibrational modes (stretching, bending, combination, first and second overtone) in Ce3+ - and Gd3+ -doped silicate glasses, prepared by means of the sol-gel technique and aimed to applications as scintillators. The presence of OH groups, belonging either to silanol (Si-OH) or to H2O should be limited, since they could cause radiative emission quenching. The samples, doped with Ce3+ or Gd3+ (0.05-3% m.f.), were submitted to thermal treatments at 450°C, 750°C, and 1050°C, to remove water and organic groups for producing a dense glass. A large amount of H2O and Si-OH is still present in samples annealed at 450°C and 750°C, while only a reduced quantity of Si-OH (evaluated as < 1% m.f.) is detected after annealing at 1050°C, i.e. in the final dense glasses (for all concentrations of both dopants). © 2002 Elsevier Science B.V. All rights reserved.
Baraldi, A., Capelletti, R., Chiodini, N., Mora, C., Scotti, R., Uccellini, E., et al. (2002). Vibrational spectroscopy of OH-related groups in Ce3+- and Gd3+ -doped silicate glasses. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 486(1-2), 408-411 [10.1016/S0168-9002(02)00743-X].
Vibrational spectroscopy of OH-related groups in Ce3+- and Gd3+ -doped silicate glasses
CHIODINI, NORBERTO;SCOTTI, ROBERTO;VEDDA, ANNA GRAZIELLA
2002
Abstract
FTIR spectroscopy was applied in the 500-14,000cm-1 range to detect OH vibrational modes (stretching, bending, combination, first and second overtone) in Ce3+ - and Gd3+ -doped silicate glasses, prepared by means of the sol-gel technique and aimed to applications as scintillators. The presence of OH groups, belonging either to silanol (Si-OH) or to H2O should be limited, since they could cause radiative emission quenching. The samples, doped with Ce3+ or Gd3+ (0.05-3% m.f.), were submitted to thermal treatments at 450°C, 750°C, and 1050°C, to remove water and organic groups for producing a dense glass. A large amount of H2O and Si-OH is still present in samples annealed at 450°C and 750°C, while only a reduced quantity of Si-OH (evaluated as < 1% m.f.) is detected after annealing at 1050°C, i.e. in the final dense glasses (for all concentrations of both dopants). © 2002 Elsevier Science B.V. All rights reserved.
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