Search results for "Dangling bond"

showing 2 items of 52 documents

Creation of glass-characteristic point defects in crystalline SiO2 by 2.5 MeV electrons and by fast neutrons

2019

The support from M -ERANET project “MyND” is acknowledged. K.K. was partially supported by the Collaborative Research Project of Laboratory for Materials and Structures, Tokyo Institute of Technology . Visiting researcher support from Ecole Polytechnique, Palaiseau is appreciated. Mr. Olivier Cavani is thanked for the expert help with irradiations.

inorganic chemicalsLuminescenceMaterials science02 engineering and technologyCrystal structure01 natural sciencesMolecular physicsCrystal0103 physical sciences:NATURAL SCIENCES:Physics [Research Subject Categories]Materials ChemistryElectron beam processingIrradiationDangling bonds[PHYS]Physics [physics]010302 applied physicstechnology industry and agricultureDangling bondElectron irradiationQuartz021001 nanoscience & nanotechnologyCondensed Matter PhysicsCrystallographic defectAmorphizationNeutron temperatureElectronic Optical and Magnetic MaterialsAmorphous solidCeramics and CompositesSilica glass0210 nano-technologyJournal of Non-Crystalline Solids
researchProduct

The structural disorder of a silica network probed by site selective luminescence of the nonbridging oxygen hole centre

2011

We studied the inhomogeneous distribution of the luminescence band associated with the nonbridging oxygen hole centre in silica through site selective excitation/detection of the zero phonon line by a tunable laser source. Defects induced in the bulk of synthetic samples by γ and β exposure exhibit an increase of the inhomogeneous width from 0.071 to 0.086 eV on increasing the irradiation dose from 2 × 10(6) to 5 × 10(9) Gy. We also investigated two defect variants stabilized at the surface of the silica nanoparticles, (≡ Si-O)3 Si–O* and (≡ Si-O)2(H-O)Si-O*, whose inhomogeneous width was measured to be 0.042 eV and 0.060 eV, respectively. These results can be accounted for by the structura…

silica inhomogeneity luminescenceCoordination spherePhotoluminescenceChemical bondPhononChemistryAnalytical chemistryDangling bondGeneral Materials ScienceIrradiationCondensed Matter PhysicsLuminescenceExcitation
researchProduct