0000000000519166

AUTHOR

F. La Mattina

showing 2 related works from this author

Optical properties and photosensitivity of vacuum synthesized Ge-doped sol-gel amorphous SiO/sub 2/

2005

We report optical and electron paramagnetic resonance investigations of gamma ray irradiation effects in sol-gel Ge-doped amorphous SiO/sub 2/. The studied materials have Ge-doping levels up to 10/sup 4/ molar part per million and were densified by two routes differing for the atmosphere: O/sub 2/+N/sub 2/ or vacuum. The obtained results evidence that irradiation affects matrix sites inducing paramagnetic defects. Furthermore, the comparison between the two densification procedures shows that vacuum atmosphere induces higher radiation sensitivity.

optical fiberMaterials sciencePhotoluminescenceradiation effectDopingtechnology industry and agricultureAnalytical chemistrychemistry.chemical_elementGermaniumAmorphous solidlaw.inventionParamagnetismNuclear magnetic resonancechemistrylawradiation-induced attenuationIrradiationElectron paramagnetic resonanceSol-gelProceedings of 2005 IEEE/LEOS Workshop on Fibres and Optical Passive Components, 2005.
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Hydrogen-Related Paramagnetic Centers in Ge-Doped Sol-Gel Silica Induced by γ-Ray Irradiation

2006

We have studied the generation mechanisms of H(II) paramagnetic centers in Ge-doped silica by investigating up to 104 mol ppm sol-gel Ge-doped silica materials. We have considered materials with the same concentrations of Ge but that are produced by two different densification routes that give rise to different concentrations of Ge-related oxygen deficient centers (GeODC(II)). These centers are characterized by an optical absorption band at ∼5.2 eV (B2 β band) and two related emissions at ∼3.2 eV and ∼4.3 eV. The GeODC(II) content was estimated by absorption and emission measurements. The H(II) centers were induced by room temperature γ-ray irradiation and their concentration was determined…

Materials scienceSilica gelDopingAnalytical chemistryGeneral ChemistryCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionBiomaterialschemistry.chemical_compoundParamagnetismchemistrylawAbsorption bandMaterials ChemistryCeramics and CompositesIrradiationAbsorption (chemistry)Electron paramagnetic resonancesol-gel glasses aerogel germanium doping germanium defects photosensitivityNuclear chemistrySol-gelJournal of Sol-Gel Science and Technology
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