J. Phys. IV France 7 (1997) C2-1139-C2-1140
XANES Study of the Gallium and Iron Environments in Phosphate Based GlassesS. Poisson and P. Berthet
Laboratoire de Chimie des Solides, URA 446 du CNRS, Bât. 414, Université Paris-Sud, 91405 Orsay cedex, France
Glasses prepared in the Na2O-M2O3-P2O5 systems (M=Ga, Fe) have been studied by X-ray absorption spectroscopy at the Ga and Fe K-edges. When these atoms are found in 6-fold coordination, striking similarities are found between their XANES spectra and those of some crystalline diphosphates. From the simulation of the XANES spectrum of crystalline NaFeP2O7 using the FEFF6 code, an ordering of the phosphorus atoms linked to the FeO6 octahedra is evidenced in the glasses.
© EDP Sciences 1997