EXAFS study of Tb-doped silica xerogels.

Francesco Rocca, a• Francesca Monti, b Alexei Kuzmin, c Alberto Dalmaso a'd and Donatella Pasqualini d particular, we are interested in characterising the strong distortion produced during the final process of the xerogels preparation: the long time high temperature treatment, in fact, results in an overall relaxation of the silica network and in the elimination of the wet components, from precursor materials, present in the pores of the gels at the first stage of preparation (Rocca et aL, 1998).