Structural characterization of glassy phases in the system Na2O-Ga2O3-P2O5 by MAS-NMR, EXAFS and vibrational spectroscopy. I. Cations coordination
| Autor: | Gabriel Llabres, B. Gilbert, A.P Esculcas, João Rocha, S. Poisson, P Berthet, Zelimir Gabelica, F. Wijzen, André Rulmont, A. Belkebir |
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| Rok vydání: | 2000 |
| Předmět: |
Chromium
Magnetic Resonance Spectroscopy Extended X-ray absorption fine structure Inorganic chemistry Sodium Cationic polymerization chemistry.chemical_element Infrared spectroscopy Gallium Nuclear magnetic resonance spectroscopy Ferric Compounds Atomic and Molecular Physics and Optics Analytical Chemistry Ion Phosphates Crystallography chemistry Octahedron X-Ray Diffraction Cations X-ray crystallography Glass Instrumentation Spectroscopy |
| Zdroj: | Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. 56(3) |
| ISSN: | 1386-1425 |
| Popis: | The cationic coordinations of phosphate based gallium sodium glasses in the system Na2O-Ga2O3-P2O5 have been studied by several techniques (71Ga and 23Na MAS-NMR, EXAFS and vibrational spectroscopies) in order to study the relationship between the structure and the chemical composition. We found that three different environments are available for the gallium ions while it is very difficult to get accurate information on the sodium coordinations. Our data show that in orthophosphate glasses, gallium is mainly tetrahedral but when the mean phosphate chain length increases, its coordination becomes more and more octahedral. In these glassy structure, it becomes then possible to dissolve large amounts of typically octahedral cations like Fe3+ or Cr3+. |
| Databáze: | OpenAIRE |
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