XRD Analysis of the Role of Cesium in Sodium-Based Geopolymer
| Autor: | Chlique, Christophe, Lambertin, David, Antonucci, Pascal, Frizon, Fabien, Deniard, Philippe, Vance, E. |
|---|---|
| Přispěvatelé: | Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Laboratoire d'Etudes de l'Enrobage des Déchets (L2ED), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'energie Atomique et aux Energies Alternatives, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element engineering.material Amorphous solid Geopolymer chemistry.chemical_compound chemistry Nepheline Caesium Pollucite Materials Chemistry Ceramics and Composites engineering [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Organic chemistry Thermal stability Feldspathoid ComputingMilieux_MISCELLANEOUS Solid solution |
| Zdroj: | Journal of the American Ceramic Society Journal of the American Ceramic Society, Wiley, 2015, 98 (4), pp.1308-1313. ⟨10.1111/jace.13399⟩ Journal of the American Ceramic Society, 2015, 98 (4), pp.1308-1313. ⟨10.1111/jace.13399⟩ |
| ISSN: | 0002-7820 1551-2916 |
| DOI: | 10.1111/jace.13399⟩ |
| Popis: | The purpose of this work was to study the role of cesium in sodium-based geopolymer and its thermal stability for nuclear waste management. A series of mixed sodium and cesium geopolymer samples (Na1−x Cs x )2O·Al2O3·SiO2·12H2O (referred to as (Na1− x Cs x )-GP, where x = 0, 0.08, 0.15, 0.42, 1) have been prepared. All geopolymer samples were heated at 1100°C for 24 h. Pollucite (CsAlSi2O6) and feldspathoid (CsAlSiO4) were crystallized from Cs-GP. Nepheline (NaAlSiO4) and a small amount of crystallized silica were obtained from Na-GP. The other geopolymers (Na1− x Cs x )-GP (x = 0.08, 0.15, 0.42) led to pollucite and nepheline main phases. Amorphous silica phase was observed in all the geopolymer samples with various amounts. Phase quantification and scanning electron microscope revealed that higher Cs concentrations in Na-GP tend to decrease the amorphous phase while improving pollucite and nepheline phase quantification. The amorphous geopolymers have also been studied by pair distribution function analysis. Tetrahedral chains formed by T–O bonding (with T = Si, Al) were shown to be more tighten around Cs+ than around Na+. It led to shorter Cs–T bond than Na–T bond matching the higher solvation property of Na+. Furthermore, thermal study analysis pointed out the fact that geopolymer samples (Na1− x Cs x )-GP, can be considered as solid solutions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text