γ-Irradiation effects in borosilicate glass studied by EPR and UV–Vis spectroscopies

Wang, T.T.; Zhang, X.Y.; Sun, Mengli; Du, Xiaolong; Guan, Ming; Peng, Haibo; Wang, T.S.

doi:10.1016/j.nimb.2019.12.007

Cited by 20 publications

(20 citation statements)

References 31 publications

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“…However, due to safety concerns, it is necessary to estimate the parameters of borosilicate glass under residual irradiation. In the past years, many groups have extensively studied the thermodynamic, chemical and mechanics properties of borosilicate glasses and significant experimental effort has been devoted to understand the evaluation of the properties of irradiated borosilicate glasses [16,17,18,19,20,21,22]. Yet, these experimental results require detailed interpretation, which could be achieved by correct understanding of the atomic scale processes associated with radiation damage and defects accumulation.…”

Section: Introductionmentioning

confidence: 99%

Properties of irradiated sodium borosilicate glasses from experiment and atomistic simulations

et al. 2021

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With a combination of atomistic modeling and experimental techniques we have investigated the structural and elastic parameters of sodium borosilicate glasses, including irradiation-induced changes. Both approaches show that the Young's modulus depends linearly on the density of material. The simulated glass density and boron speciation match also the estimates by independent, elemental glass composition-based models, indicating that atomistic simulations could be used in validation of theoretical models and experimental results. This allows us to formulate Young's modulus -density relationships for investigated borosilicate glasses and test the existing empirical model for description of Vickers hardness of these materials. The simulation of irradiation reveals a change of B [4] content under irradiation. By applying a simple defects accumulation procedure we are able to

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Section: Introductionmentioning

confidence: 99%

Properties of irradiated sodium borosilicate glasses from experiment and atomistic simulations

et al. 2021

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“…This was anticipated from the first derivative spectra. The four-line shape and structure for BOHC is reported by many researchers through simulations and it matches our first-derivative experimental EPR spectra [27,28,232]. There are no additional signals identified in the secondderivative EPR spectra for LiNaBSi glass.…”

Section: Glass Colorationsupporting

confidence: 89%

“…The signal attributed to Ecentres (g~1.97) remains stable at 473 K and disappears at higher temperatures [27,176,179]. This signal could be due to POR's [27,57,174,232]. The peak-to-peak intensity for this signal after annealing at higher than 573 K decreases, indicating decreased abundance due to recombination / annihilation or different stages of annealing of POR's as discussed previously in this section.…”

Section: Glass Colorationsupporting

confidence: 51%

“…These paramagnetic centres absorb electromagnetic radiation in UV, visible and near infrared range and undergo electronic transitions. The optical absorption bands reveal information about the characteristic and concentration of the paramagnetic centres formed when materials (glass here) are subjected to irradiation [232].…”

Section: Uv-vis-nir Spectroscopy: Backgroundmentioning

confidence: 99%

“…The g-values calculated from second-derivative spectra (Figure 5.10) are g ≈ 2.005, 1.999. The POR is reported by many authors in the literature [27,57,174,232]. It is defined as a hole trapped on a non-bridging oxygen or O2bonded to one Si atom in the glass matrix, and sometimes it is also known as the oxy-defect [27,28,31,32,56,57,168,249] show that the EPR signal due to POR's is unstable at 573 K, since its abundance / concentration starts to decrease -as indicated by the low S/N peak-to-peak intensity [28,31,57].…”

Section: Glass Colorationmentioning

confidence: 99%

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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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Disorder Induced by Gamma Irradiation in Borosilicate Glasses

Zhu

Yang

et al. 2023

Springer Proceedings in Physics

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γ-Irradiation effects in borosilicate glass studied by EPR and UV–Vis spectroscopies

Cited by 20 publications

References 31 publications

Properties of irradiated sodium borosilicate glasses from experiment and atomistic simulations

Properties of irradiated sodium borosilicate glasses from experiment and atomistic simulations

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

Disorder Induced by Gamma Irradiation in Borosilicate Glasses

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