EPR study of structural defects in ion-implanted multicomponent silicate glasses

Богомолова, Л.Д.; Deshkovskaya, A.A.; Красильникова, Н.А.; Battaglin, Giancarlo; Caccavale, F.

doi:10.1016/0022-3093(92)90005-5

Cited by 12 publications

(3 citation statements)

References 16 publications

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“…In Figures S3 and S5, EPR signals disappeared after annealing at temperatures higher than 473 K for NaBaBSi glass specimens irradiated with 0.5 MGy and annealed at 16 and 24 hours, respectively, suggesting that thermal energy enables electron-hole pair recombination; and there is no paramagnetic defect generated at the lower dose of 0.5 MGy which is stable at higher temperatures [78]. The signal due to Ecentres at g~1.97 remains stable after annealing at 473 K but the broad, isotropic signal at g~2.011 disappeared after annealing at 373 K. Both resonances may be due to metallic sodium colloids.…”

Section: Effects Of Thermal Annealing On Radiation-induced Defectsmentioning

confidence: 99%

Gamma irradiation-induced defects in borosilicate glasses for high-level radioactive waste immobilisation

Rautiyal

Gupta

Edge

et al. 2021

Journal of Nuclear Materials

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Section: Effects Of Thermal Annealing On Radiation-induced Defectsmentioning

confidence: 99%

Gamma irradiation-induced defects in borosilicate glasses for high-level radioactive waste immobilisation

Rautiyal

Gupta

Edge

et al. 2021

Journal of Nuclear Materials

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“…In Figure 5.8 and 5.9, no EPR signals in NaBaBSi glass irradiated with 0.5 MGy, remain stable at temperatures higher than 473 K when annealed for 16 and 24 hours, respectively. This suggests electron-hole recombination or annihilation is enabled by the thermal energy, and at higher temperatures no paramagnetic defects generated at 0.5 MGy remain stable [279]. The two resonance EPR signal at g~1.97…”

Section: Effects Of Thermal Annealing On Radiation Induced Defectsmentioning

confidence: 93%

“…Many research studies present in the literature that have reported the mitigation of radiation-induced defects by trapping of free electrons and holes by multivalent cations such as rare earths (Yb, Gd, Eu) and transition metals (Fe, Mn, Cr) [6,134,206,[279][280][281]. This defect-hopping or electron/holes trapping process can also occur in NaBaBSi and LiNaBSi glasses loaded with HLW under optimum redox conditions.…”

Section: Effects Of Multivalent Elements On Radiation-induced Defectsmentioning

confidence: 99%

Radiation damage effects on the structure and properties of radioactive waste glasses

Rautiyal¹

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The performance assessment of glass matrices currently being used in different nuclear energy producing countries to contain and immobilise high-level waste (HLW) waste is crucial for safe and economic disposal. During the first ~500 years of geological disposal fission products will me the main source or radiation and they decay by beta-gamma emission. We studied different borosilicate glasses used in different countries to immobilise HLW, such as Indian glass (NaBaBSi), UK glasses (LiNaBSi), also called MW- Mixture Windscale, UK-CaZn a modified version of MW, French glass (SON68) and a glass proposed by six collaborating nations, called the International Simple Glass (ISG), to see whether / how irradiation defects are dependent on glass composition. Glasses were externally irradiated using a 60Co gamma source to study the effects of beta-gamma radiation (a gamma emitter loses it energy to atomic electrons they then further interact via coulombic interactions); and by He2+ ion implantation to study the effects of alpha particles. A multi-spectroscopic approach was used to characterise glass specimens before and after irradiation. NaBaBSi and LiNaBSi glasses were irradiated using 60Co gamma photons and we found boron-oxygen hole centres (BOHC), electrons trapped at alkali cations or ET centres and peroxy-radicals (PORs) as common defect in these glasses. In addition, E- or polaron centres which may be related to formation of elemental / metallic sodium colloids formed in NaBaBSi glass. Time-dependent thermal annealing of the irradiated glasses revealed that POR’s are the most thermally stable of the defect centres. BOHC and ET centres were common to SON68, ISG and CaZn glasses. In NaBaBSi, LiNaBSi and SON68 glasses loaded with non-active simulated HLW no sharp and intense signals indicative of radiation-induced paramagnetic defect centres was observed. In the study of NaBaBSi and LiNaBSi glasses doped with 0.19. 0.99, and 4.76 mol% Fe2O3 prepared in an oxidising melting environment, electron paramagnetic resonance (EPR) spectroscopy showed that gamma irradiation induced sharp and intense signals exist for only the 0 and 0.19 mol% Fe2O3 doped samples and disappeared for samples containing higher molar concentrations of Fe2O3. It is postulated that, upon gamma irradiation, in LiNaBSi glass Fe2+ is oxidised to Fe3+ by the capture of holes, whereas in NaBaBSi glass Fe3+ is reduced to Fe2+ due to capture of electrons. Further research is needed to understand the reasons behind these different behaviours.

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Evaluation of Agriglass as an Environment Friendly Slow Release Fertilizer

Ouis

Abd-Eladl

Abou-Baker

2016

Silicon

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EPR study of structural defects in ion-implanted multicomponent silicate glasses

Cited by 12 publications

References 16 publications

Gamma irradiation-induced defects in borosilicate glasses for high-level radioactive waste immobilisation

Gamma irradiation-induced defects in borosilicate glasses for high-level radioactive waste immobilisation

Radiation damage effects on the structure and properties of radioactive waste glasses

Evaluation of Agriglass as an Environment Friendly Slow Release Fertilizer

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