Raman study of xMeO•(100-x)[P2O5•Li2O] (MeO ⇒ Fe2O3 or V2O5) glass systems

Glasses from xMeO center dot(100-x)[P2O5 center dot Li2O] (MeO double right arrow Fe2O3 or V2O5) systems, with 0 <= x <= 50 mol%, were prepared and investigated by Raman spectroscopy. The influence of Fe2O3 and V2O5 Content on the structure of P2O5 center dot Li2O glass matrix was followed. The P2O5 center dot Li2O glass matrix presents three absorption bands characteristic to metaphosphate chain structures. The addition of Fe2O3 or V2O5 determines the modification of the structure of the studied glasses. The Raman spectra of xFe(2)O(3)center dot(100-x)[P2O5 center dot Li2O] do not present any absorption bands characteristic to Fe2O3 but its evolution is dependent on the iron content. The Raman spectra of xV(2)O(5)center dot(100-x)[P2O5 center dot Li2O] present, besides the bands specific for the matrix, some bands assigned to characteristic vibrations of V-O bonds which are evidenced only for high content of V2O5. The evolution of the spectra is dependent of V2O5 content. (c) 2006 Elsevier B.V. All rights reserved.