Phosphate-based glasses and glass ceramics for immobilization of lanthanides and actinides

Stefanovsky, S. V.; Stefanovsky, O.I.; Danilov, S. S.; Кадыко, М. И.

doi:10.1016/j.ceramint.2018.06.208

Cited by 31 publications

(13 citation statements)

References 29 publications

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“…The high intensity of the bands corresponding to non-bridging oxygen atom (NBO) vibration resulting in bonds breaking inside the glass network is caused by the high content of barium oxide, which is a glass modifier [43][44][45][46]. The replacement of barium oxide in the amount of 20 mol.% by phosphorus oxide causes the appearance of new bands (1000-1350 cm −1 region) related to the bonds in [PO4] units and broken P-Obonds (Figure 5) [47,48]. Additionally, bands at 764 cm −1 , which derive from Ge-Obond vibrations and bond vibrations in [GeO6] units, are characterized by smaller intensities than the parallel bands The replacement of barium oxide in the amount of 20 mol.% by phosphorus oxide causes the appearance of new bands (1000-1350 cm −1 region) related to the bonds in [PO 4 ] units and broken P-O − bonds (Figure 5) [47,48].…”

Section: Structural Studiesmentioning

confidence: 99%

“…The replacement of barium oxide in the amount of 20 mol.% by phosphorus oxide causes the appearance of new bands (1000-1350 cm −1 region) related to the bonds in [PO4] units and broken P-Obonds (Figure 5) [47,48]. Additionally, bands at 764 cm −1 , which derive from Ge-Obond vibrations and bond vibrations in [GeO6] units, are characterized by smaller intensities than the parallel bands The replacement of barium oxide in the amount of 20 mol.% by phosphorus oxide causes the appearance of new bands (1000-1350 cm −1 region) related to the bonds in [PO 4 ] units and broken P-O − bonds (Figure 5) [47,48]. Additionally, bands at 764 cm −1 , which derive from Ge-O − bond vibrations and bond vibrations in [GeO 6 ] units, are characterized by smaller intensities than the parallel bands from the spectrum in Figure 5.…”

Section: Structural Studiesmentioning

confidence: 99%

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Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

et al. 2020

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Glass and ceramic materials doped with rare earth (RE) ions have gained wide interest in photonics as active materials for lasers, optical amplifiers, and luminescent sensors. The emission properties of RE-doped glasses depend on their chemical composition, but they can also be tailored by modifying the surrounding active ions. Typically, this is achieved through heat treatment (including continuous-wave and pulsed lasers) after establishing the ordering mechanisms in the particular glass–RE system. Within the known systems, silicate glasses predominate, while much less work relates to materials with lower energy phonons, which allow more efficient radiation sources to be constructed for photonic applications. In the present work, the luminescent and structural properties of germanate glasses modified with phosphate oxide doped with Eu3+ ions were investigated. Europium dopant was used as a “spectroscopic probe” in order to analyze the luminescence spectra, which characterizes the changes in the local site symmetries of Eu3+ ions. Based on the spectroscopic results, a strong influence of P2O5 content was observed on the excitation and luminescence spectra. The luminescence study of the most intense 5D0→7F2 (electric dipole) transition revealed that the increase in the P2O5 content leads to the linewidth reduction (from 15 nm to 10 nm) and the blue shift (~2 nm) of the emission peak. According to the crystal field theory, the introduction of P2O5 into the glass structure changes the splitting number of sublevels of the 5D0→7F1 (magnetic dipole) transition, confirming the higher polymerization of fabricated glass. The slightly different local environment of Eu3+ centers the results in a number of sites and causes inhomogeneous broadening of spectral lines. It was found that the local asymmetry ratio estimated by the relation of (5D0→7F2)/(5D0→7F1) transitions also confirms greater changes in local symmetry around Eu3+ ions. Our results indicate that modification of germanate glass by P2O5 allows control of their structural properties in order to functionalize the emissions for application as luminescent light sources and sensors.

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Section: Structural Studiesmentioning

confidence: 99%

Section: Structural Studiesmentioning

confidence: 99%

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

et al. 2020

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“…2a). This is 1-3 orders of magnitude lower than the rate of Nd leaching from aluminophosphate glasses under the same conditions [14]. In experiments at 150°C, a falling of 2-3 orders of magnitude in the differential rate of Nd leaching is observed (Fig.…”

Section: Hydrolytic Stabilitymentioning

confidence: 70%

Titanate-Based Ceramic as a Matrix for Curium and Rare Earth Element Fraction of Radioactive Waste Immobilization

Danilov¹,

Frolova²,

Винокуров³

et al. 2020

RAD Conference Proceedings

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The effective isolation of radioactive waste (RW) from the environment is the main problem for the further development of nuclear power. The main phases in titanate-based ceramics are perovskite, rutile, zirconolite and murataite. Murataite grains have a zonal structure with high content of rare earth elements at the center of structure and low content of these at edges, that precludes their leaching in contact with a solution. Murataite-based ceramics containing simulated rare earth elements of high level waste (HLW) were produced via melting of oxide mixtures in a resistance furnace at 1500°C. All samples were composed of mainly murataite and minor perovskite, crichtonite, zirconolite, and pyrophanite/ilmenite phases. Thus, murataite is the dominant host phase for a sample containing zirconium oxide. All samples were analyzed by scanning electron microscopy with an energy dispersive X-ray spectroscopy. Elemental leaching rates from the ceramic with low perovskite content were lower by one order of magnitude then leaching rates for high perovskite content.

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“…Crystalline phases within a glassy matrix of GCM can be zirconolite, pyrochlore, brannerite, britholite within a matrix made of a A-B-Si glass, or monazite, or NZP in a Na-Al-P glass. In silicate glass ceramics, radionuclides are incorporated both in the phases of silicates (britholite), titanates, and zirconates (pyrochlore, zirconolite), and molybdates (powellite), and in phosphate glass ceramics-into phosphates with the structure of monazite, kosnarite, or langbeinite [63][64][65][66][67][68][69][70][71]. Table 1 outlines various waste types that have been immobilised into GCM both at laboratory and pilot-scale facilities [72,73].…”

Section: Examples Of Gcm Nuclear Wasteformsmentioning

confidence: 99%

Glass Crystalline Materials as Advanced Nuclear Wasteforms

2021

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Glass crystalline materials (GCM) are of increasing interest as advanced nuclear wasteforms combining the advantages of vitreous and crystalline matrices. The GCM are versatile wasteforms envisaged for a wider use to immobilise various types of both radioactive and chemically hazardous wastes. They can be produced either via low temperature sintering using precursors composed of glass frit, oxides, and crystalline phases or through conventional melting aiming to produce first a parent glass, which is then crystallised by a controlled thermal schedule to obtain target crystalline phases within the GCM. Utilization of GCM is highlighted as a perspective wasteform for immobilization of partitioned radionuclide streams.

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Phosphate-based glasses and glass ceramics for immobilization of lanthanides and actinides

Cited by 31 publications

References 29 publications

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

Titanate-Based Ceramic as a Matrix for Curium and Rare Earth Element Fraction of Radioactive Waste Immobilization

Glass Crystalline Materials as Advanced Nuclear Wasteforms

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