Gamma ray irradiation effects on the optical properties of BaO–Na2O–B2O3–SiO2 glasses

Kaur, Ravneet; Singh, Surinder; Pandey, O.P.

doi:10.1016/j.molstruc.2013.05.037

Cited by 36 publications

(10 citation statements)

References 29 publications

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“…The increase in treatment time results in a decrease in the energy gap from 3.08 eV for the untreated sample to 2.95 eV for the treated sample for 100 hours at 624°C. This decrease is probably related to the gradual increase at the concentration of nonbridging oxygens and formation of a niobium oxide rich crystalline phase. In addition, the reduction in hydroxyl content was observed for longer heat treatments, which is of interest for optical applications since hydroxyl groups are often responsible for nonradiative processes associated with luminescent centers.…”

Section: Resultsmentioning

confidence: 99%

High niobium oxide content in germanate glasses: Thermal, structural, and optical properties

et al. 2017

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Niobium alkali germanate glasses were synthesized by the melt-quenching technique. The ternary system (90-x)GeO 2 -xNb 2 O 5 -10K 2 O forms homogeneous glasses with x ranging from 0 to 20 mol%. Samples were investigated by DSC and XRD analysis, FTIR and Raman spectroscopy, and optical absorption. Structural and physical features are discussed in terms of Nb 2 O 5 content. The niobium content increase in the glass network strongly modifies the thermal, structural and

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Section: Resultsmentioning

confidence: 99%

High niobium oxide content in germanate glasses: Thermal, structural, and optical properties

et al. 2017

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“…Encouraged by the lab-scale studies, a commercial plant scale sodium barium borosilicate glass (reference code: SB-44: Na2O ~10mol%, BaO ~20 mol%, B2O3~ 20 mol%, SiO2 ~30 mol %) with waste loading ~20 mol% was successfully fabricated at ~925 o C without any crystalline sulphate phase separation (Kaushik et al 2006). The addition of Ba 2+ also enhanced the ability of the borosilicate glass to withstand X-ray and γ-ray radiation (Kaur et al 2013;Tuscharoen et al 2012;Kaewjaeng et al 2012) and the low fabrication temperature improved retention of volatile elements such as Tc and Cs in the host matrix.…”

Section: Kbmentioning

confidence: 99%

Structural characterization of sulphate and chloride doped glasses for radioactive waste immobilisation

Vaishnav¹

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“…This enables simulation of the radiation effects of electronic and nuclear stopping separately and individually. This is done in particle accelerators or using electron beam facilities (TEM) [36,128,172,185,186,190,[193][194][195]. It can simulate the dose of many years in a short time (in one or several days).…”

Section: Effects Of Nuclear Interactions In Glassesmentioning

confidence: 99%

“…It is a technique that measures the absorption of radiation as a function of wavelength. It is a type of optical absorption technique in which the light of UV-Vis-nIR region (UV 190-400 nm, visible 400-800 nm, and near infrared 780-3300 nm) is absorbed or transmitted by the material [194,229,230]. This absorption results in the excitation of the electrons from the ground state to a higher energy state.…”

Section: Uv-vis-nir Spectroscopy: Backgroundmentioning

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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Gamma ray irradiation effects on the optical properties of BaO–Na2O–B2O3–SiO2 glasses

Cited by 36 publications

References 29 publications

High niobium oxide content in germanate glasses: Thermal, structural, and optical properties

High niobium oxide content in germanate glasses: Thermal, structural, and optical properties

Structural characterization of sulphate and chloride doped glasses for radioactive waste immobilisation

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

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