Effect of composition on peraluminous glass properties: An application to HLW containment

Piovesan, Victor; Bardez-Giboire, Isabelle; Perret, Damien; Montouillout, V.; Pellerin, Nadia

doi:10.1016/j.jnucmat.2016.11.008

Cited by 12 publications

(3 citation statements)

References 28 publications

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“…Here one can estimate the waste loading, without reference to a specific waste composition, by taking the mass fraction of [MoO 3 +ZrO 2 +RE 2 O 3 ], representing the fission products, to the other components; for the current study, this is 44‐48 mass% (assuming La…Lu), vs 30‐33 mass% for the peralkaline glasses of the same oxides from a previous study 29 . Note that the compositions here differ from peraluminous glasses studied by other groups, 34 which have higher Al 2 O 3 and lower RE 2 O 3 levels than considered in the current work.…”

Section: Introductionmentioning

confidence: 92%

Partitioning of rare earths in multiphase nuclear waste glass‐ceramics

Chen

Marcial

Ahmadzadeh

et al. 2020

Int J of Appl Glass Sci

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Alumino‐borosilicate glass‐ceramics (GCs) containing alkali (Na), alkaline earth (Ca), rare earth (RE) (one of La … Lu, Y), and transition metals (Zr and Mo) were formulated to test the effects of composition and RE cation size on the crystallization of simulated nuclear waste GCs. Eight‐oxide glasses were formulated in the peraluminous ([Na2Oexcess]=[Na2O]‐[Al2O3]‐[ZrO2]<0) region with 10 mol.% RE2O3 and 15 mol.% B2O3. Glasses were melted and quenched, reheated, and slow‐cooled to promote crystallization, and then characterized using quantitative X‐ray diffraction and electron probe microanalysis. Transition metal phases [powellite (Ca,Na,RE)MoO4 and zirconia (Zr,RE)O2 or zircon (Zr,RE)SiO4] always formed, while borosilicate (RE3BSi2O10) or silicate [oxyapatite (RE,Ca,Na)10Si6O26 or keiviite (RE2Si2O7)] plus borate (REBO3) phases also formed, depending on the size of the RE cation and hence its preferred coordination number. All crystalline phases were found to contain RE elements, and often phases incorporated other cations (Zr, Ca, B) which were not nominally part of their pure stoichiometry. These results suggested that the glass formulation and RE size strongly influenced the RE environment in the glass and hence the crystal phases formed. The formation of RE borosilicate, versus separate RE borate and RE silicate phases, also suggested original differences in the glass structure.

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Section: Introductionmentioning

confidence: 92%

Partitioning of rare earths in multiphase nuclear waste glass‐ceramics

Chen

Marcial

Ahmadzadeh

et al. 2020

Int J of Appl Glass Sci

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“…[5][6][7] Two composition ranges, both in the SiO 2 -B 2 O 3 -Al 2 O 3 -Na 2 O-CaO-RE 2 O 3 system, have already been explored. [8][9][10][11][12][13][14][15][16] These two domains of composition are defined by the molar oxides R ) with M and M' corresponding to alkaline and alkalineearth elements, respectively. In a peralkaline glass (R P > 0.5), the modifier ions are in excess with respect to the aluminum ions whereas in a peraluminous glass (R P < 0.5), the aluminum ions are in excess.…”

Section: Introductionmentioning

confidence: 99%

“…15 A candidate composition for long-term studies in contact with aqueous solutions was selected by optimizing its composition as a function of its physico-chemical properties (viscosity, glass transition temperature, density, homogeneity). 16 The resistance of glass to aqueous alteration is not an intrinsic property of the material, but is rather the response of glass to a range of environmental factors. [17][18][19][20] In a closed system, glass dissolution kinetics in contact with water begins by a release of alkaline elements, a process that is rapidly limited by the diffusion rate through the dealkalized glass layer.…”

Section: Introductionmentioning

confidence: 99%

Chemical durability of peraluminous glasses for nuclear waste conditioning

Piovesan¹,

Bardez-Giboire²,

Fournier³

et al. 2018

npj Mater Degrad

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For the handling of high level nuclear waste (HLW), new glass formulations with a high waste capacity and an enhanced thermal stability, chemical durability, and processability are under consideration. This study focuses on the durability of peraluminous glasses in the SiO 2-Al 2 O 3-B 2 O 3-Na 2 O-CaO-La 2 O 3 system, defined by an excess of Al 3+ ions compared with the network-modifying cations Na + and Ca 2+. To qualify the behavior of such a peraluminous glass in a geological storage situation, its chemical durability was studied in various environments (pure water, groundwater, and alkaline solutions related to a cement environment) and glass alteration regimes (initial rate, residual rate, and resumption of alteration). The alteration solution was characterized by inductively coupled plasma, and the altered glass by scanning electron microscopy, X-ray diffraction and secondary ion mass spectrometry. A comparative study of the chemical durability of these and reference glasses (ISG and SON68) over all timescales highlights the remarkable properties of the former. While their initial dissolution rate is of the same order as the reference glasses, the gel formed under silica saturation conditions is more passivating, making its dissolution rate at least one order of magnitude lower, while its low alkalinity makes it less susceptible to clayey groundwater and highly alkaline solutions.

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The Adaptation of Recycling Processes to Pu-Multi Recycling

Miguirditchian¹,

Taylor²

2021

Encyclopedia of Nuclear Energy

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Effect of composition on peraluminous glass properties: An application to HLW containment

Cited by 12 publications

References 28 publications

Partitioning of rare earths in multiphase nuclear waste glass‐ceramics

Partitioning of rare earths in multiphase nuclear waste glass‐ceramics

Chemical durability of peraluminous glasses for nuclear waste conditioning

The Adaptation of Recycling Processes to Pu-Multi Recycling

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