[en] 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+.
Disciplines :
Chemistry
Author, co-author :
Belkebir, A.; Université de Liège - ULiège
Rocha, J.
Esculcas, A.P.; Université de Liège - ULiège
Berthet, P.
Poisson, S.
Gilbert, Bernard ; Université de Liège - ULiège > Chimie analytique et électrochimie
Gabelica, Z.
Llabres, Gabriel ; Université de Liège - ULiège > Département de physique > Département de physique
Wijzen, F.
Rulmont, André ; Université de Liège - ULiège > Chimie inorganique structurale
Language :
English
Title :
Structural Characterization of Glassy Phases in the System Na2o-Ga2o3-P2o5 by Mas-Nmr, Exafs and Vibrational Spectroscopy. I. Cations Coordination
Publication date :
10 February 2000
Journal title :
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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