A5072783239- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Nuclear materials and radiation effects
- Building materials and conservation
- Cultural Heritage Materials Analysis
- Material Dynamics and Properties
- Recycling and utilization of industrial and municipal waste in materials production
- Mineralogy and Gemology Studies
- Conservation Techniques and Studies
- Pigment Synthesis and Properties
- Lanthanide and Transition Metal Complexes
- Geological and Geochemical Analysis
- Nuclear Materials and Properties
- Radioactive element chemistry and processing
- High-pressure geophysics and materials
- ZnO doping and properties
- Crystallization and Solubility Studies
- Archaeological Research and Protection
- Advanced Condensed Matter Physics
- Analytical Chemistry and Sensors
- Material Science and Thermodynamics
- Gas Sensing Nanomaterials and Sensors
- Zeolite Catalysis and Synthesis
- Solid-state spectroscopy and crystallography
- Silicon Nanostructures and Photoluminescence
Institut de Recherche de Chimie Paris
2015-2024
Chimie ParisTech
2015-2024
Université Paris Sciences et Lettres
2015-2024
Centre National de la Recherche Scientifique
2014-2024
Sorbonne Université
2007-2023
Délégation Ile-de-France Villejuif
2018
Centre de recherche et de restauration des musées de France
2015
Laboratoire de Chimie
2003-2013
Chimie de la Matière Condensée de Paris
2007-2013
École Nationale Supérieure de Chimie, de Biologie et de Physique
2011
We combine small-angle x-ray scattering (SAXS) and wide-angle (WAXS) with aerodynamic levitation techniques to study in situ phase transitions the liquid state under contactless conditions. At very high temperatures, yttria-alumina melts show a first-order transition, previously inferred from separation quenched glasses. how transition coincides narrow reversible maximum SAXS indicative of unmixing on nanoscale, combined an abrupt realignment WAXS features related shifts polyhedral packing...
The improved hydrogen gas sensing performances of PdO-functionalized ZnO : Pd films compared to pristine are successfully reported in this work. functionalized samples showed excellent properties.
Crystallization of the poorly durable Na 2 MoO 4 phase able to incorporate radioactive cesium must be avoided in SiO –Al O 3 –B –Na O–CaO glasses developed for immobilization Mo‐rich nuclear wastes. Increasing amounts B and were added a glass, crystallization tendency was studied. decreased with increase concentration whereas CaMoO crystallize increased due preferential charge compensation BO − entities by + ions. 29 Si MAS NMR showed that molybdenum acts as reticulating agent glass...
Abstract While glass alteration in liquid water has been widely studied for decades, unsaturated atmosphere (relative humidity, RH < 100%) far less examined. However, the understanding of mechanisms involved reactions between and vapor state is fundamental to several fields such as industry, conservation glasses cultural heritage long-term assessment nuclear waste glasses. This paper outlines issues raised by atmospheric these attempts summarize scientific approaches findings three...
High-resolution inelastic neutron scattering was used to identify major sources of low-frequency vibrations in zeolite crystals. Dispersed and nondispersed modes were found, both which are prominent the early stages compressive amorphization but decline dramatically strength once a glass conventional density is created. By identifying dispersed with characteristic various secondary building units zeolitic structures, Boson peak, glassy state, can be attributed within connected rings many...
Neutron diffraction experiments have been performed on alkali diborate glasses and melts, ${M}_{2}\mathrm{O}\ensuremath{-}2{\mathrm{B}}_{2}{\mathrm{O}}_{3}$ with $M=\mathrm{Li},$ Na, K, in order to investigate the structural changes above glass transition. In glassy state, contributions of fourfold- threefold-coordinated boron could be clearly distinguished first peak correlation functions, which has fitted two Gaussian components. The fraction fourfold coordination ${(N}_{4})$ is 0.46,...
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...
High‐temperature neutron diffraction and Raman spectra have been obtained on M 2 O–2B O 3 (M=Li, Na, K) glasses melts. Both techniques indicate a coordination change of boron atoms: the tetrahedral sites present in are converted into triangular sites. These changes borate network yield modifications alkali environment, as assessed for Li using isotopic substitution technique. We observe that atoms charge‐compensating position glass modifying liquid. structural important implications toward...