Structural investigations of the xTeO-(1-x)GeO (x=0, 0.2, 0.4, 0.6, 0.8 and 1) tellurite glasses: A composition dependent Raman spectroscopic study

A.G. Kalampounias (1, 2) , N.K. Nasikas (1, 3) , G.N. Papatheodorou (1)

1 Foundation for Research and Technology Hellas - Institute of Chemical Engineering and High Temperature Chemical Processes
2 Department of Chemical Engineering
3 Department of Materials Science

Raman spectra of xTeO-(1-x)GeO (x=0, 0.2, 0.4, 0.6, 0.8 and 1) germanium tellurite glasses were measured and analyzed in an effort to follow the structural changes caused by mixing two typical glass-formers. Systematic Raman intensity measurements have been performed in an effort to elucidate the composition induced structural changes and a possible mechanism that accounting for these changes was proposed. The network structure of the glass is characterized by TeO trigonal bipyramid mixed with TeO trigonal pyramid units, while GeO tetrahedral units are also present. Changing the GeO content results to conversion of the TeO units to TeO units with a neutral doubly-bridged oxygen atom, while the existence of charged terminal oxygen atoms is questionable. The measured relative Raman intensities are semi quantitatively correlated to the transformation of the TeO trigonal bipyramid into TeO trigonal pyramids.

Mots clés: A. Amorphous materials; A. Glasses; A. Non-crystalline materials; A. Oxides; C. Raman spectroscopy

Domaines: Science des matériaux [cond-mat.mtrl-sci]

A.G. Kalampounias, N.K. Nasikas, G.N. Papatheodorou. Structural investigations of the xTeO-(1-x)GeO (x=0, 0.2, 0.4, 0.6, 0.8 and 1) tellurite glasses: A composition dependent Raman spectroscopic study. Journal of Physics and Chemistry of Solids, 2011, 72 (9), pp.1052. ⟨10.1016/j.jpcs.2011.05.016⟩. ⟨hal-00778410⟩