A5044666885- Glass properties and applications
- Nuclear materials and radiation effects
- Luminescence Properties of Advanced Materials
- Advanced NMR Techniques and Applications
- Recycling and utilization of industrial and municipal waste in materials production
- Building materials and conservation
- Concrete and Cement Materials Research
- NMR spectroscopy and applications
- Cultural Heritage Materials Analysis
- Mineralogy and Gemology Studies
- Material Dynamics and Properties
- Advanced Condensed Matter Physics
- Geological and Geochemical Analysis
- Pigment Synthesis and Properties
- Radioactive element chemistry and processing
- Solid-state spectroscopy and crystallography
- Phase-change materials and chalcogenides
- Advanced ceramic materials synthesis
- Clay minerals and soil interactions
- Nuclear Materials and Properties
- Material Science and Thermodynamics
- Zeolite Catalysis and Synthesis
- Electrical Contact Performance and Analysis
- Diverse Cultural and Historical Studies
- Dielectric materials and actuators
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA Marcoule
2015-2024
Université de Montpellier
2020-2024
Direction des énergies
2010-2020
CEA Valduc
2006-2008
CEA Paris-Saclay
1997-2001
Laboratoire de Chimie Moléculaire
1997-2000
Silicate glasses are durable materials, but they sufficiently to confine highly radioactive wastes for hundreds of thousands years? Addressing this question requires a thorough understanding the mechanisms underpinning aqueous corrosion these materials. Here we show that in silica-saturated solution, model glass nuclear interest corrodes at rate dramatically drops as passivating layer forms. Water ingress into glass, leading congruent release mobile elements (B, Na and Ca), is followed by...
Abstract The question of silicate glass chemical durability is at the heart many industrial and environmental issues, with certain glasses, such as bioglasses, needing to transform rapidly, while others, like nuclear extremely slowly. Due wide diversity composition for these types materials their metastability—no thermodynamic equilibrium can be reached between solution—the evaluation remains a scientific challenge. In this article, we review current state knowledge on alteration mechanisms...
Boron speciation was investigated in soda‐lime borosilicate glass containing zirconium. In such compositions, competition between charge compensators (here, sodium and calcium) can occur for the compensation of tetrahedral boron or octahedral zirconium units. 11 B MAS NMR is particularly suitable obtaining data on preferential behavior that directly affects coordination number. addition to classical proportions tri‐ boron, additional be obtained contributions involved these two numbers. An...
The influence of the temperature and quenching rate on structure a borosilicate glass was studied by high-resolution solid-state ${}^{11}$B, ${}^{23}$Na, ${}^{29}$Si nuclear magnetic resonance (NMR) high-temperature Raman spectroscopy. Data were obtained for in solid state after annealing at cooling rates covering four orders magnitude as well liquid from experiments calorimetry rheological data. Nuclear measurements used to calibrate spectra order quantify change boron coordination with...
Two series of borosilicate glasses were prepared for studying the influence substitution (i) CaO Na2O and (ii) ZrO2 SiO2 on glass durability. They corroded in buffered aqueous solution at pH 6.9 8.0. An inverse correlation was found between initial dissolution rate final degree corrosion saturation regime. It observed as a function given well composition fixed pH. A ToF-SIMS study permeation foreign ions layer, SAXS characterization layer reorganization, Monte Carlo simulations provide key...
Abstract While the influence of silicate oxide glass composition on its chemical durability is increasingly known, contribution structure only less well understood, yet crucial for an accurate description aqueous alteration mechanisms. The effect structural disorder can be investigated by varying thermal history glass. Furthermore, changes generated self-irradiation in nuclear glasses compared with those induced fast quenching. In context deep geological disposal vitreous matrices, it then...
Abstract Borosilicate glasses are widely used to confine high-level radioactive wastes. The lifetime of these materials could reach hundreds thousands years if leaching the glass into groundwater enables formation a passivating gel layer. Even in this regime, will never stop corroding as thermodynamic equilibrium between and solution cannot be achieved. Therefore, accurate predictions durability including passivation, require deep understanding mechanisms controlling so-called residual rate....
Abstract Seven magnesium‐containing aluminoborosilicate glasses, with three to five oxides, have been studied through comprehensive multinuclear solid‐state NMR ( 11 B, 27 Al, 29 Si, 23 Na, 17 O, and 25 Mg) Raman spectroscopy. The progressive addition of cations the substitution sodium calcium by magnesium illuminate impact on glass structure. proportion tri‐coordinated boron drastically increased addition, demonstrating poor charge‐compensating capabilities in tetrahedral units. Oxygen‐17...
Boron-11 and silicon-29 NMR spectra of xSiO2 (1 − x)B2O3 glasses (x = 0.40, 0.80 0.83) have been calculated using a combination molecular dynamics (MD) simulations with density functional theory (DFT) calculations parameters. Structure models 200 atoms generated classical force fields subsequently relaxed at the PBE-GGAlevel DFT theory. The gauge including projector augmented wave (GIPAW) method is then employed for computing shielding electric field gradient tensors each silicon boron...
In nuclear borosilicate glasses, when molybdenum is in too high concentration and it combines with other elements such as alkali alkaline‐earth may form crystalline molybdates, including sodium molybdate, Na 2 MoO 4 , during melt cooling. a vitrification context, the origin of this phenomenon must be understood to control avoid appearance water‐soluble phase. The solubility limit 3 was found 2.5 mol% simplified SiO –B O –Na O–CaO glass at about 1300°C. Higher concentrations induced liquid...