Search results for "Aluminosilicates"

showing 2 items of 2 documents

Photosensitivity of SiO2–Al and SiO2–Na glasses under ArF (193 nm) laser

2009

Abstract Photosensitivity of SiO 2 –Al and SiO 2 –Na glass samples was probed by means of the induced optical absorption and luminescence as well as by electron spin-resonance (ESR) after irradiation with excimer-laser photons (ArF, 193 nm). Permanent visible darkening in the case of SiO 2 –Al and transient, life time about one hour, visible darkening in the case of SiO 2 –Na was found under irradiation at 290 K. No darkening was observed at 80 K for either kind of material. This investigation is dedicated to revealing the electronic processes responsible for photosensitivity at 290 and 80 K. The photosensitivity of both materials is related to impurity defects excited directly in the case …

Electron mobilityPhotoluminescenceChemistryDopingAnalytical chemistryCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsPhotosensitivityImpurityMaterials ChemistryCeramics and CompositesIrradiationRadiation effects Glasses Laser–matter interactions Optical spectroscopy Defects Optical properties Absorption Lasers Luminescence Photoinduced effects Time resolved measurements Oxide glasses Alkali silicates Aluminosilicates Silica Silicates Radiation Electron spin resonanceSpectroscopyLuminescence
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Towards the Loewenstein limit (Si/Al = 1) in thermally stable mesoporous aluminosilicates

1999

The use of complexing agents to generate polynuclear precursor species containing both Al and Si allows the synthesis of thermally stable mesoporous aluminosilicates including solely tetrahedrally coordinated aluminium, in which the Si/Al ratio can be modulated down to a minimum Si/Al value of 1.06(4). Cabrera Medina, Saul, Saul.Cabrera@uv.es ; El Haskouri, Jamal, Jamal.Haskouri@uv.es ; Latorre Saborit, Julio, Julio.Latorre@uv.es ; Beltran Porter, Aurelio, Aurelio.Beltran@uv.es ; Beltran Porter, Daniel, Daniel.Beltran@uv.es ; Amoros del Toro, Pedro Jose, Pedro.Amoros@uv.es

Materials scienceLoewenstein limit ; Mosoporous ; Aluminosilicates ; PolynuclearUNESCO::QUÍMICAchemistry.chemical_elementNanotechnologyAluminosilicates:QUÍMICA [UNESCO]CatalysisAluminosilicateAluminiumMaterials ChemistryLimit (mathematics)PolynuclearMetals and AlloysGeneral ChemistryLoewenstein limitMosoporousUNESCO::QUÍMICA::Química macromolecularSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialschemistryChemical engineeringCeramics and Composites:QUÍMICA::Química macromolecular [UNESCO]Mesoporous materialValue (mathematics)
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