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RESEARCH PRODUCT

Growth of paramagnetic defects by gamma rays irradiation in oxygen-deficient silica

Franco Mario GelardiSimonpietro AgnelloGianpiero Buscarino

subject

Fused quartzSpin statesChemistryAstrophysics::High Energy Astrophysical PhenomenaGamma rayAnalytical chemistryE CENTERSCondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionTRIPLET-STATEParamagnetismNuclear magnetic resonancelawMaterials ChemistryCeramics and CompositesIrradiationSIO2Triplet stateElectron paramagnetic resonanceMicrowave

description

Abstract We report an electron paramagnetic resonance (EPR) study of gamma rays irradiation effects on an oxygen-deficient silica obtained from fused quartz. We have found that three types of E′ centers, E α ′ , E γ ′ and E δ ′ , and a paramagnetic defect in a spin triplet state (S = 1) are induced. The EPR signals dependence on the microwave power have been investigated. The concentrations of these centers as a function of gamma ray irradiation show that for high dose a limit value is reached suggesting a generation process from precursors.

yearjournalcountryeditionlanguage
2005-07-01
10.1016/j.jnoncrysol.2005.04.016http://hdl.handle.net/10447/7048