Paramagnetic defects in gamma-irradiated Na/K-silicate glasses

Zatsepin, A. F.; Guseva, V. B.; Vazhenin, V. A.; Artoymov, M. Yu.

doi:10.1134/s1063783412090326

Cited by 10 publications

(17 citation statements)

References 25 publications

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“…The applied magnetic field, B 0 , was estimated to be about 3483.5 G, which is close to the position of the peak in Fig. 4(a) and in agreement with the results published by Zatsepin et al [19] Fig. 4(b) also exhibits the EPR spectra as a function of annealing temperature.…”

Section: Resultssupporting

confidence: 76%

“…The EPR spectra clearly indicate that the paramagnetic defects are indeed created in the silicate irradiated by 4.5 kGy cray. The first derivative curve with a peak and a split valley has been shown to be superposed by HC 1 and HC 2 , [19] which can be verified by the fundamental equation of EPR spectroscopy as:…”

Section: Resultsmentioning

confidence: 90%

“…The molecular structure of the former can be represented as "SiAO Å Á Á ÁMe + which signifies an oxygen-dangling bond near a metal ion. The latter, also called NBOHC (nonbridging oxygen hole center), is actually identical to HC 1 but without any metal ions ("SiAO Å ) [18,19]. As indicated by Zatsepin et al [19], absorption bands located around 2.0 eV ($620 nm) and 2.75 eV ($450 nm), as shown in Fig.…”

Section: Resultsmentioning

confidence: 91%

“…The latter, also called NBOHC (nonbridging oxygen hole center), is actually identical to HC 1 but without any metal ions ("SiAO Å ) [18,19]. As indicated by Zatsepin et al [19], absorption bands located around 2.0 eV ($620 nm) and 2.75 eV ($450 nm), as shown in Fig. 2(a), can be assigned to NBOHC and HC 1 ("SiAO Å Á Á ÁNa + ), respectively.…”

Section: Resultsmentioning

confidence: 99%

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Spectroscopic investigation of gamma radiation-induced coloration in silicate glass for nuclear applications

Tsai

Chao

et al. 2014

Journal of Nuclear Materials

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Spectroscopic investigation of gamma radiation-induced coloration in silicate glass for nuclear applications

Tsai

Chao

et al. 2014

Journal of Nuclear Materials

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“…Different mechanisms through which they can form in glasses upon irradiation or how/whether they can have deteriorating effects on the performance in terms of durability and their thermal stability is dicussed in detail in the following section [28,32,165,173,174,[176][177][178].…”

Section: Structural Defects In Borosilicate Glasses Due To Irradiationmentioning

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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Antimony-modified soda-lime-silica glass: Towards low-cost radiation-resistant materials

Gupta

Chen

Rautiyal

et al. 2022

Journal of Non-Crystalline Solids

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Paramagnetic defects in gamma-irradiated Na/K-silicate glasses

Cited by 10 publications

References 25 publications

Spectroscopic investigation of gamma radiation-induced coloration in silicate glass for nuclear applications

Spectroscopic investigation of gamma radiation-induced coloration in silicate glass for nuclear applications

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

Antimony-modified soda-lime-silica glass: Towards low-cost radiation-resistant materials

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