Experimental study of modifying component agency on devitrification of Na2O-Al2O3-P2O5 glasses under elevated temperatures

Мартынов, К. В.; Budantseva, N. A.; Тананаев, И. Г.; Kovalsky, A. M.; Kotelnikov, A. R.

doi:10.2205/2011nz000202

Vestn. Otd. nauk Zemle

2011

DOI: 10.2205/2011nz000202

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Experimental study of modifying component agency on devitrification of Na2O-Al2O3-P2O5 glasses under elevated temperatures

К. В. Мартынов¹,

N. A. Budantseva²,

И. Г. Тананаев³

et al.

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Cited by 5 publications

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“…Aluminophosphate glass, compared to borosilicate glass, is capable of incorporating larger amounts of polyvalent transition elements, sulfates, and chlorides, but is less resistant to crystallization and is characterized by the shorter interval of variation of the melt viscosity [2][3][4]. Numerous attempts were made to improve glasses on aluminum phosphate base, e.g., by introducing boron and silicon oxides [5,6].…”

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Phase composition, structure, and hydrolytic durability of glasses in the Na2O-Al2O3-(Fe2O3)-P2O5 system at replacement of Al2O3 by Fe2O3

et al. 2015

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Samples of sodium aluminum iron phosphate glasses of the composition (mol %) 40 Na 2 O, (20 -x) Al 2 O 3 , x Fe 2 O 3 , 40 P 2 O 5 (series I) and 35 Na 2 O, (20 -x) Al 2 O 3 , x Fe 2 O 3 , 45 P 2 O 5 (series II) were synthesized. The phase composition and structure of the samples obtained were determined by X-ray diffraction and IR spectroscopy. At equimolar replacement of Al 2 O 3 by Fe 2 O 3 , the structure of the quenched glasses of series I does not change appreciably, in contrast to glasses of series II. Annealing of the glasses leads to their partial devitrification with segregation of crystalline aluminum iron phosphate phases. Glasses of series I with up to 10 mol % Al 2 O 3 replaced by Fe 2 O 3 exhibit the highest hydrolytic durability: The leach rates of Na, Al, Fe, and P from the samples are within (4-10) × 10 -8 g cm -2 day -1 , meeting the requirements of GOST (State Standard) R 50 926-96. Thus, glasses with approximately equal molar concentrations of Al 2 O 3 and Fe 2 O 3 are the most resistant to crystallization and hydrolysis.

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confidence: 99%

“…Positions of the absorption band maxima (cm -1 ) in the IR spectra of annealed glass samples of series II P-O-P, ν s FeO 4 , ν s AlO6 …”

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confidence: 99%

Phase composition, structure, and hydrolytic durability of glasses in the Na2O-Al2O3-(Fe2O3)-P2O5 system at replacement of Al2O3 by Fe2O3

et al. 2015

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IR and Raman Spectroscopy of Sodium-Aluminophosphate Glasses for Immobilizing High-Level Wastes from Spent Nuclear Fuel Reprocessing

Stefanovsky

Myasoedov

Remizov³

et al. 2014

J Appl Spectrosc

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The structure of sodium-aluminophosphate glasses containing constituents of high-level wastes (cesium, magnesium, copper, and molybdenum oxides) from uranium-graphite reactors was studied by IR and Raman spectroscopy coupled with x-ray diffraction. The structural network was shown to be composed of short P-O chains with embedded AlO 4 tetrahedra. Cross-linking by Mg 2+ was possible in the Mg-bearing samples. The effect of the other oxides (Cs 2 O, MoO 3 , CuO) on the glass structure was negligible for the occurring amounts. The glasses devitrifi ed partially upon quenching and more strongly upon annealing. This was refl ected in splitting of the vibrational bands for bonds in the glass anionic structural motif.Introduction. High-level wastes (HLW) from extraction reprocessing of spent nuclear fuel (SNF) from VVER-440 and BN-600 reactors, maritime reactors, and research reactors are vitrifi ed at PA Mayak in an EP-500 electric furnace in order to produce sodium-aluminophosphate glass [1]. Plant PT-1 for reprocessing SNF from AMB-type uranium-graphite reactors is currently under reconstruction. HLW that are unavoidably produced by extraction reprocessing should also be sent to the EP-500 vitrifi cation furnace and incorporated into the phosphate glass [2]. Preliminary research used fi ve raffi nate simulants corresponding to the fi ve AMB SNF U + 9% Mo/Mg, U + 9% Mo/Ca, U + 3% Mo /Mg, UO 2 + Cu/Mg, and UO 2 + Mg. The research found that Mo and Cu had a negative effect on the quality of the sodium-aluminophosphate glasses that are used at PA Mayak to immobilize HLW. These components can cause the glass to segregate and/or crystallize with the separation of molybdates and/or spinels. This has a negative effect on the rheological properties of the melts and the chemical and thermal resistance of the fi nal glass forms [3]. We studied [4] previously the phase composition and element distribution between phases of glasses bearing HLW components of SNF from AMB reactors (Cs, Mo, Mg, Cu) using x-ray phase analysis (XPA) and scanning electron microscopy (SEM). It was shown that the glasses crystallized partially upon quenching and to a large extent upon annealing with the separation of aluminum, sodium-aluminum and sodium-cesium-aluminum orthophosphates from a (Na, Cs) 3x-3 Al x PO 4 solid solution. The Cs content could reach 0.32 formula units, which affected substantially its quantitative distribution among the occurring phases and eventually the chemical and radiation resistance of the glasses.Herein we present results from a study of glasses for immobilizing HLW of SNF from AMB reactors using IR vibrational and Raman spectroscopy.Experimental. Sodium-aluminophosphate glass used to vitrify HLW and medium-level wastes (MLW) in the EP-500 electric furnace was selected as the base glass [5]. The three principal components of the phosphate glass acted as the components of HLW simulants from extraction reprocessing AMB SNF. The mass fractions of Na, Al, and P oxides decreased proportionally. Sodium was replaced by cesium in ...

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Hydrolytic durability of uranium-containing sodium aluminum (iron) phosphate glasses

et al. 2017

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Experimental study of modifying component agency on devitrification of Na2O-Al2O3-P2O5 glasses under elevated temperatures

Cited by 5 publications

References 0 publications

Phase composition, structure, and hydrolytic durability of glasses in the Na2O-Al2O3-(Fe2O3)-P2O5 system at replacement of Al2O3 by Fe2O3

Phase composition, structure, and hydrolytic durability of glasses in the Na2O-Al2O3-(Fe2O3)-P2O5 system at replacement of Al2O3 by Fe2O3

IR and Raman Spectroscopy of Sodium-Aluminophosphate Glasses for Immobilizing High-Level Wastes from Spent Nuclear Fuel Reprocessing

Hydrolytic durability of uranium-containing sodium aluminum (iron) phosphate glasses

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