Competitive trapping in sodium disilicate glasses doped with Eu+3

Mackey, John; Smith, Herbert L.; Nahum, J.

doi:10.1016/0022-3697(66)90108-9

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…This model is also supported from the previous observations such that Eu 3ϩ ions can easily be transformed into Eu 2ϩ by capturing the free electrons located nearby. 29,30 Transformation of Eu 3ϩ into Eu 2ϩ is further supported from the temperature stability of the burnt hole as well as erasure of holes by Ar ϩ -laser irradiation. 14 The effect of reducing atmosphere during glass melting on the local structure surrounding Eu 3ϩ ions will be discussed later.…”

Section: A Spectral Hole Properties Of Eu 3¿ In Borate Glassesmentioning

confidence: 99%

Mechanism of the room-temperature persistent spectral hole burning in borate glasses doped with Eu3+

Chung

Heo

2002

Journal of Applied Physics

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Spectroscopic properties and room-temperature persistent spectral hole burning mechanisms of Eu3+-doped borate glasses were investigated. The depth of the burnt hole increased with the amount of carbon powders (i.e., degree of reducing atmosphere). This was attributed to the formation of defects which can donate free electrons for the photoreduction of Eu3+→Eu2+. Holes survived >104 s at 20 K and approximately 40% of hole areas were preserved after annealing at 280 K. The photoreduction of Eu3+ to Eu2+ is a primary mechanism of hole burning and this hypothesis was supported by spectral hole properties, relaxation properties as well as changes in the local structure of Eu3+ in glasses.

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Section: A Spectral Hole Properties Of Eu 3¿ In Borate Glassesmentioning

confidence: 99%

Mechanism of the room-temperature persistent spectral hole burning in borate glasses doped with Eu3+

Chung

Heo

2002

Journal of Applied Physics

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“…Mackey et al measured the optical absorption spectra of the Eu 3ϩ -doped silicate glasses irradiated with x ray and attributed the induced band at ϳ330 nm to the electron-trapped Eu 3ϩ ions. 23 This center, designated as an ͓Eu 3ϩ ͔ Ϫ state, is considered to be different from the Eu 2ϩ ions. According to their results, the induced absorption band at around 320 nm in the x-rayirradiated glass can be attributed to the activated state of the Eu 3ϩ ions.…”

Section: Room-temperature Hole Burning For Eu 3¿ Coupling With Al mentioning

confidence: 99%

Room-temperature persistent spectral hole burning ofEu3+coupling withAl3+

Nogami

Ishikawa

2001

Phys. Rev. B

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Room-temperature persistent spectral hole burning was observed in Eu 3ϩ -doped Al 2 O 3 -SiO 2 glasses. The sol-gel-derived Eu 3ϩ -doped glasses were heated in hydrogen gas and irradiated with x ray, in which the oxygen deficient centers were induced in Al-O bonds and some Eu 3ϩ ions were reduced into Eu 2ϩ by heating in hydrogen gas. The spectral holes were burned in the excitation spectra of the 7 F 0 → 5 D 0 transition of Eu 3ϩ . The maximum depth of the hole burned at room temperature was found to be ϳ10% of the total excitation intensity for both the glasses and independent of the treatment conditions of glasses. A proposed model for hole burning is the excitation of the Eu 3ϩ ion and subsequent hole trapping in the oxygen-defect centers in the Al-O bonds. The burnt holes were easily erased by laser irradiation with the energy different from burning one.

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“…Fayad et al [68] reported optical absorption bands between 500 and 600 nm in gamma-irradiated borosilicate glasses which they attributed to BOHC's and similarly absorption bands fitted to spectra for the NaBaBSi glasses in Figure 5.30 at 527 nm and 568 nm can also be attributed to BOHC's or hole trapped centres [261]. Jiang et al [262] and Mackey et al [263] have reported absorption bands due to Na + ions or electrons trapped at alkali ions and, based on their results, we can attribute the absorption bands present at 319 and 324 nm to trapped electrons of alkali or Na + ions (plasmon band); furthermore bands at 249 and 253 nm may be due to Fe trace impurities [65,242,261]. An optical absorption band at 568 nm for LiNaBSi glass irradiated with 0.5 MGy can be attributed to a combination of BOHC's and POR's and a band at 622 nm for the sample irradiated with 5 MGy is also attributed to BOHC's [261,264].…”

Section: Glass Colorationmentioning

confidence: 94%

“…There are absorption bands fitted at 354, 376 and 551 nm which are also attributed to BOHC's [263,264]. The two absorption bands are attributed to ET centres at 274 and 289 nm and a band at 263 nm is attributed to Fe impurities [65,261,263,264].…”

Section: Glass Colorationmentioning

confidence: 99%

“…The two absorption bands are attributed to ET centres at 274 and 289 nm and a band at 263 nm is attributed to Fe impurities [65,261,263,264]. [259,260] 657 nm (Ecentres + PORs) [259,260] 568 nm (BOHC+ PORs) [259,261,264] 622 nm (BOHC) [264] 527 nm (BOHC) [261] 568 nm (BOHC) [261] 354 nm (BOHC) [264] 551 nm (BOHC) [261] 324 nm (Ecentre) [265] 319 nm (Ecentre) [265] 289 nm (ET centres) [263] 376 nm (BOHC) [264] 253 nm (Fe impurity) [242,261] 249 nm (Fe impurity) [242,261] 263 nm (Fe impurity) [242,261] 274 nm (ET centres) [263] 5.4 Discussion…”

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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Competitive trapping in sodium disilicate glasses doped with Eu+3

Cited by 19 publications

References 6 publications

Mechanism of the room-temperature persistent spectral hole burning in borate glasses doped with Eu3+

Mechanism of the room-temperature persistent spectral hole burning in borate glasses doped with Eu3+

Room-temperature persistent spectral hole burning ofEu3+coupling withAl3+

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

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