Te-125 and V-51 static NMR study of V2O5-TeO2 glasses

The structures of V2O5-TeO2 glasses are investigated by means of Te-125 and V-51 static NMR spectroscopies and the local structures around the Te and V atoms are discussed in detail from the respective NMR spectra. The fracti on of TeO3 trigonal pyramids increases and that of TeO4 trigonal bipyramids decreases with increasing V2O5 content. The structures of V2O5-TeO2 glasse s are quite different from those of tellurite glasses containing network-mo difying oxides. The fraction of VO4 tetrahedra increases and that of VO5 tr igonal bipyramids decreases with increasing V2O5 content. Both chains consi sting of tellurite structural units and those consisting of vanadate struct ural units contribute to the formation of the glass network in V2O5-TeO2 gl asses.