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    STUDIA PHYSICA - Issue no. 2 / 2006  
         
  Article:   FT-IR AND RAMAN SPECTROSCOPIC STUDY OF LI2O-CUO-TEO2 GLASSES.

Authors:  CARMEN MARCUS, R. CICEO-LUCACEL, I. ARDELEAN. 		 
       
         
  Abstract:  The local structure of the xLi2O•(1-x)[2TeO2•CuO] (0 ≤ x ≤ 0.5) glass system was investigated by means of FT-IR and Raman spectroscopies. For the glass network was proposed a structure mainly composed of TeO4 trigonal bipyramids (tbp), TeO3 trigonal pyramids (tp) and TeO3+1 polyhedral units. It was found that with the increase of Li2O content the modification of tellurite network consist in the conversion of a part of TeO4 tbp into TeO3 tp via intermediate coordination TeO3+1 polyhedra. Simultaneously the nonbridging oxygens (NBOs) number increases, denoting the depolymerization of the glass structure.  
         
     
         
         
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