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RESEARCH PRODUCT
Radiation stability of long-term annealed bi-phasic advanced ceramic breeder pebbles
Regina KnitterJulia M. HeuserA. ZarinsA. ZarinsGunta KizaneLarisa Baumanesubject
Materials scienceMechanical EngineeringRadicalAnalytical chemistry01 natural sciences010305 fluids & plasmasIonizing radiationlaw.inventionsymbols.namesakeNuclear Energy and Engineeringlawvisual_art0103 physical sciencesRadiolysisvisual_art.visual_art_mediumsymbolsGeneral Materials ScienceCeramicIrradiation010306 general physicsLuminescenceElectron paramagnetic resonanceRaman spectroscopyCivil and Structural Engineeringdescription
Abstract Advanced ceramic breeder pebbles consisting of Li4SiO4 and additions of Li2TiO3 were tested regarding their long-term thermal and to their radiation stability. As-prepared and long-term annealed pebbles were irradiated with accelerated electrons (up to 6 MGy) to investigate the formation of radiation-induced defects and radiolysis products caused by ionizing radiation. By using Raman spectroscopy the formation of significant amounts of radiolysis products can be excluded. Electron spin resonance spectrometry revealed several paramagnetic radiation-induced defects, such as HC2 centres ( SiO 4 3 - and TiO 3 - ), E’ centres ( SiO 3 3 - and TiO 3 3 - ), Ti 3 + centres and peroxide radicals ( Si O O·). Radiation-induced defects forming in the first stage of the radiolysis seem to be more pronounced in long-term annealed samples. Thermally stimulated luminescence showed relatively low temperatures (40–200 °C) for the thermal recovery of the radiation-induced defects by accelerated electrons. Moreover, the main recovery process of defects takes place in the first 8–10 days after the irradiation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 | Fusion Engineering and Design |